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1. Industry Background and Challenges‌ In mining and metallurgical production processes, large volumes of corrosive media—such as acidic solutions, alkaline liquids, and organic solvents—must be handled. These substances are not only highly corrosive but may also contain solid particles or other impurities, imposing stringent demands on pump materials, sealing performance, and operational stability. Selecting the appropriate pump solutions is critical to ensuring continuous and safe production. 2. Overview of Anhui Changyu Pump & Valve Solutions‌ Anhui Changyu Pump & Valve Manufacturing Co., Ltd. has developed a range of specialized pump products tailored to the unique demands of the mining and metallurgical industries. Below are the key pump solutions offered: ‌2.1. Corrosion-Resistant Magnetic Drive Pumps‌ ‌Working Principle‌: Utilizes magnetic coupling technology to eliminate mechanical seals, ensuring leak-free operation. ‌Materials & Applicable Media‌: Constructed with high-performance corrosion-resistant alloys (e.g., 304, 316, 316L stainless steel, Hastelloy), ideal for handling highly corrosive fluids. ‌Advantages‌: Compact design, smooth operation, and suitability for diverse corrosive media in mining and metallurgical processes. ‌2.2 Plastic-Lined Slurry Pumps‌ ‌Applications‌: Designed for corrosive slurries such as phosphoric acid slurry and fluorosilicic acid slurry. ‌Features‌: Plastic-lined interior for enhanced corrosion resistance, combined with superior abrasion resistance for particle-laden media. ‌Advantages‌: Easy maintenance and reliable performance, making them ideal for slurry transportation in mining and metallurgy. ‌2.3 Stainless Steel Centrifugal Pumps‌ ‌Materials‌: Premium stainless steel construction for excellent corrosion and high-temperature resistance. ‌Applications‌: Suitable for seawater, brine, organic solvents, and other corrosive media at varying concentrations. ‌Advantages‌: Compact structure, high efficiency, and versatility for diverse corrosive fluid handling needs in the industry. 3. Detailed Application Scenario Analysis‌ ‌3.1. Ore Processing‌ ‌Process Description‌: Involves crushing, grinding, and leaching of ores, requiring handling of large volumes of corrosive media. ‌Pump Selection‌: Corrosion-resistant magnetic drive pumps and stainless steel centrifugal pumps are ideal for ore processing, ensuring stable transportation and leak prevention. ‌3.2 Flotation Separation‌ ‌Process Description‌: Separates valuable minerals from waste rock via flotation technology, involving corrosive reagents. ‌Pump Selection‌: Plastic-lined slurry pumps excel in flotation due to their corrosion and abrasion resistance. ‌3.3 Smelting & Extraction‌ ‌Process Description‌: Operates in high-temperature, high-pressure environments with corrosive media. ‌Pump Requirements‌: Pumps must resist corrosion, high temperatures, and pressure. Magnetic drive pumps and stainless steel centrifugal pumps are preferred for their superior performance. ‌3.4 Tailings Treatment‌ ‌Process Description‌: Handles slag and tailings containing solid particles and acidic waste liquids. ‌Pump Selection‌: Plastic-lined slurry pumps, balancing corrosion and abrasion resistance, are optimal for tailings processing. 3.5 Cooling Circulation‌ ‌Process Description‌: Requires corrosion-resistant cooling media circulation in smelting. ‌Pump Requirements‌: Pumps must resist corrosion and ensure long-term stability. Stainless steel centrifugal pumps are well-suited for this application. 4. Conclusion‌ Leveraging extensive expertise and cutting-edge technology in pump and valve manufacturing, Anhui Changyu Pump & Valve Manufacturing Co., Ltd. delivers a comprehensive range of high-efficiency, reliable pumping solutions tailored for the mining and metallurgical industries. These solutions not only address the industry's specialized requirements for handling corrosive media but also enhance operational stability and safety in production processes. Moving forward, as technology evolves and industry demands continue to shift, Anhui Changyu Pump & Valve remains committed to innovation and R&D, striving to provide the mining and metallurgical sectors with superior pump products and technical services.  

This paper addresses three core pain points in wastewater treatment for the chemical industry, analyzing the technical compatibility of Anhui Changyu Pump & Valve's flagship products.   1. Three Core Challenges in Chemical Effluent Treatment‌ ‌1.1 Media Complexity‌ Chemical wastewater often contains strong acids, alkalis, organic solvents, and solid particles, leading to corrosion, crystallization, and clogging in conventional pumps. For example, one chemical plant experienced pump casing perforation due to chloride-induced corrosion, resulting in monthly maintenance costs exceeding ‌100,000 RMB‌. 1.2 Harsh Operating Conditions‌ High temperatures (up to ‌150°C‌) and high pressures (some process sections require ‌≥2.5MPa‌) demand superior sealing performance and structural integrity. Industry reports (2024) indicate that ‌23% of unplanned shutdowns‌ are caused by pump/valve failures. 1.3 Environmental Compliance Pressure‌ The updated ‌GB31571-2025 Petroleum & Chemical Industry Emission Standards‌ mandate a leakage rate below ‌0.1%‌, making traditional packed-seal pumps increasingly non-compliant.   2. Scenario-Based Selection Strategies‌ 2.1 Highly Corrosive Media (e.g., Hydrofluoric Acid, Mixed Acids)‌ ‌Recommended Model:‌ ‌CYQ Fluoroplastic Magnetic Drive Pump‌ ‌Key Features:‌ Full perfluoroelastomr (FFKM) seals + silicon carbide (SiC) bearings Compatible with ‌pH 0–14‌ ‌Case Study:‌ Achieved ‌8,000+ hours‌ of continuous operation in lithium battery waste acid treatment with zero corrosion.   2.‌2  High-Solid Content Wastewater (e.g., Catalyst Particles, Sludge)‌ ‌Cost-Effective Option:‌ ‌FYH Fluoroplastic Submersible Pump‌ (≤20% solids) ‌Unique Advantage:‌ Open-type triple-channel impeller design improves particle passage by ‌40%‌ vs. standard pumps. ‌Application Example:‌ Used in a ‌titanium dioxide plant‌ (Anhui) for titanium slag wastewater (particle size ≤8mm).‌High-Pressure Alternative:‌ ‌CYF Fluoroplastic Centrifugal Pump‌ (requires pre-filtration).   2.3 High-Temperature/Pressure Conditions (e.g., Distillation Tower Effluent)‌ ‌High-Temp CYQ Model:‌ Equipped with ‌samarium-cobalt (SmCo) magnets‌, maintaining ‌>92% magnetic drive efficiency at 150°C‌. ‌Alternative:‌ ‌CYC Stainless Steel Magnetic Pump‌ (requires cooling below ‌120°C‌).   2.4 Environmentally Sensitive Zones‌ ‌Mandatory Choice:‌ ‌CYQ/CYC Magnetic Pump Series‌ ‌Certified Leakage Rate:‌ ‌<0.01%‌, compliant with ‌EU TA-Luft Standards‌. ‌Case Implementation:‌ Adopted plant-wide in a ‌Shanghai fine chemical park‌ as a replacement for traditional pumps.   3. Selection Pitfall Avoidance Guide‌ ‌3.1 Common Mistakes to Avoid‌ ‌Stainless Steel Pumps (CYC/FY Series):‌Not suitable for media containing ‌>50ppm chloride ions‌ (prone to stress corrosion cracking). ‌CYF Centrifugal Pumps:‌Dry running must be avoided (fluoroplastic material has poor heat conductivity and may deform).   ‌3.2 Efficiency-Enhancing Configurations‌ ‌For Crystallizing Media:‌Install ‌flushing ports‌ on ‌CYQ pumps‌. ‌For Fluctuating Flow Rates:‌Equip ‌FYH pumps‌ with ‌variable frequency control systems‌ (energy savings ≥30%).   This selection system can cover ‌over 95% of chemical industry wastewater scenarios‌. Final confirmation should be based on ‌specific media composition reports‌ (must include ‌Cl⁻, F⁻, and solid content‌ data).           2.‌2<

This article analyzes the available pump types for specific media to help you make a faster and more effective selection, and also provides some data for your reference.   1.Working condition characteristics analysis   Medium characteristics Strong acidity: pH=2 is a strong acid environment, and the acid corrosion resistance of the material needs to be considered   Oxidation: The medium has oxidizing properties, and the material's antioxidant capacity needs to be evaluated   Containing solid particles: The presence of small sand particles will cause wear problems (it is recommended to confirm the particle size distribution and concentration)   2.Material selection   2.1 It is recommended to use PTFE (polytetrafluoroethylene) or F46 lined pump body, which has the following features:   ✓ Strong acid resistance (applicable to the full range of pH 0-14) ✓ Excellent oxidation resistance ✓ Smooth surface and not easy to scale 2.2 Mechanical seals are recommended to use SiC/SiC pairing, which is more resistant to particle wear than graphite   2.3 Key selection parameters   Required notes Speed ≤ 2900rpm: reduce particle erosion and wear Impeller type semi-open/open impeller: avoid blockage of closed impeller flow channel Gap design is 0.3-0.5mm larger than standard pump to accommodate particle passage Shaft seal type: double-end mechanical seal + flushing water (Plan53B external flushing solution is recommended)     3. Special design points   Wear-resistant structure The impeller front cover is thickened by 2-3mm A replaceable wear-resistant plate is set at the volute of the pump body The surface of the flow-through parts can be hardened   4. Operation suggestions   It is recommended to install a Y-type filter at the inlet (the mesh size is determined by the particle size) The minimum flow rate should be >30% Qn to prevent solid deposition The flow channel should be flushed in time when the machine is shut down   5. Recommended typical models   Domestic: IHF80-65-160 fluoroplastic centrifugal pump (with wear-resistant modification kit) Imported: CPK80-200F (with impeller for granular media) If the budget is li mited, you can consider: FSB80-50-200 (need to confirm the actual particle parameters)   If you have better ideas, please leave a message. We are happy to learn new knowledge and provide better service. Attached is the performance curve of our IHF chemical pump：

Introduction: The Industrial Value of Slurry Pumps‌ Slurry pumps serve as core conveying equipment in industries such as mining, metallurgy, and chemical processing, undertaking the critical task of transporting highly abrasive, high-concentration solid-liquid mixtures. According to 2024 data from the China Heavy Machinery Industry Association, the global slurry pump market has surpassed $5.2 billion, with China accounting for 38% of the market share.   1. Core Knowledge System of Slurry Pumps‌ 1.‌1 Basic Definition and Working Principle‌ 1）Professional Definition‌: A slurry pump (Slurry Pump) is a centrifugal pump specifically designed for transporting slurries containing solid particles. 2）Working Principle‌: The rotation of the impeller generates centrifugal force, imparting kinetic energy to the solid-liquid mixture (Key parameters: Head 30-150m, Flow rate 10-6000m³/h). 1.2 Comparison of Mainstream Types ‌Project Site‌‌ Company ‌Application Scenario Phosphoric acid slurry in phosphate fertilizer production Anhui Changyu Pump And Valve (CHANGYU) Fluoroplastic slurry pumps, corrosion-resistant horizontal centrifugal pumps. River dredging Grundfos Submersible slurry pumps. Mine tailings transportation Shijiazhuang Industrial Pump Factory Vertical submerged pumps, chemical slurry circulation pumps. Blast furnace slag treatment in steel plants Anhui Changyu Pump And Valve (CHANGYU) High-temperature slurry pumps (with cooling system, heat-resistant alloy steel material such as CD4MCu).   3. Key Performance Indicators‌ 1）‌Wear Rate‌: Hard alloy lining with HRC58 or higher 2）‌NPSHr‌: ≤4.5m 3）‌Efficiency‌: Heavy-duty pumps achieve 75-82%   2. Selection Decision Tree‌ 2.‌1 Medium Characteristics Analysis‌ ‌Particle Size‌: μm-level to mm-level ‌Concentration Range‌: 5%-70% wt ‌pH Value‌: Acidic/Alkaline medium ‌2.2 Operating Condition Matching‌ 1）‌98% Concentrated Sulfuric Acid Circulation (80°C)‌: ‌CYF Series (Fluoroplastic-Lined Pump)‌ — ‌CYF80-50-250 2）‌High-Hardness Mineral Slurry (Quartz Sand Tailings, SiO₂ Content >90%)‌: ‌CYH Series (High-Chrome Alloy Pump)‌ — ‌CYH150-400B‌ 3）‌Titanium Dioxide Acid Digestion Filtration (20% Sulfuric Acid + Titanium Slag)‌:Fluorine-Lined Filter Press Pump (PTFE Back Ring on Impeller, Outlet with Safety Pressure Relief Valve) — ‌CYF80-65-160   3. Fluoroplastic Slurry Pump Maintenance Instructions‌ 3.‌1 Daily Operation Maintenance‌ 1） Vibration Monitoring‌ Daily inspection of bearing vibration value (should be ≤4.5mm/s) Abnormal vibration requires immediate impeller balance check 2） Sealing System Management‌ Mechanical seal flush water pressure must be maintained ‌0.1-0.2MPa higher‌ than pump chamber pressure Weekly inspection of seal leakage (normal ≤5 drops/minute) 3.‌2 Periodic Maintenance Standards‌ 1） Flow-Part Inspection‌ Measure fluoroplastic lining thickness every ‌500 hours‌ (wear allowance ≥3mm) Impeller and wear ring clearance should be ‌0.5-1.0mm‌ 2） Lubrication System‌ Bearings: Replace grease every ‌2000 hours‌ (recommended ‌PTFE-based grease‌) Motor bearings: Annual cleaning and oil change 3.3 Special Condition Handling‌ 1）Crystalline Medium Treatment‌ Flush pump chamber with clean water after shutdown (especially when handling crystallizing media) For long-term shutdowns, drain residual liquid and perform drying treatment ‌2）Temperature Control‌ Monitor lining thermal deformation when medium temperature ‌>80°C‌ Avoid sudden cooling/heating (‌

#Submersible pumps are core equipment in chemical processes. With their corrosion resistance and efficient transportation, they significantly improve production safety and efficiency. According to global market data in 2024, submersible pumps account for 35% of the chemical industry, of which #fluoroplastic submersible pumps and #stainless steel submersible pumps are the two main types, targeting different working conditions.   1. Fluoroplastic submersible pump   Application areas: strong acid (such as sulfuric acid, hydrochloric acid), strong alkali and organic solvent transportation, commonly used in electroplating, pharmaceuticals, and wastewater treatment.   ①Advantages: Extremely corrosion-resistant, PTFE material can resist 98% of chemical media; Good sealing performance, reducing the risk of leakage; Lightweight design, easy installation and maintenance.   ②Disadvantages: Low mechanical strength, poor adaptability to high temperature and high pressure scenes; Price is higher than ordinary metal pumps (average price is 20%-30% higher).   2. Stainless steel submersible pump   Application areas: medium and low corrosive media (such as salt water, weak acid), food processing and petroleum industry.   ①Advantages: Sturdy structure, suitable for high pressure and high temperature environment; Low cost, market share of about 60%; High degree of customization (such as 316L stainless steel model). ②Disadvantages: Insufficient tolerance to highly corrosive media such as hydrofluoric acid; Long-term use may cause pitting due to chloride ions.   2. The innovative contribution of submersible pumps to the chemical industry   Submersible pumps solve the leakage and efficiency problems of traditional pumps in the transportation of corrosive and high-temperature media through the design of direct immersion in the medium, becoming a key equipment for chemical process upgrades. Its core changes are reflected in two major technical routes:   4. Breakthrough application of fluoroplastic submersible pumps   Corrosion-resistant revolution: Using materials such as PTFE, it can withstand 98% of chemical media (such as hydrofluoric acid and concentrated sulfuric acid), which can extend the equipment life of high-corrosion fields such as electroplating and pharmaceuticals by 3-5 times   Safety upgrade: Magnetic drive technology (such as the Coenco brand) completely eliminates the risk of leakage and meets the explosion-proof requirements for the transportation of flammable and explosive media   5. Adaptability optimization of stainless steel submersible pumps   Cost-effectiveness advantage: It occupies 60% of the market share and is suitable for medium and low corrosion scenarios (such as salt water and weak alkali). It has been expanded to the food processing field through the upgrade of 316L material   High temperature and high pressure adaptation: Sulzer API 610 BB5 pumps achieve stable operation at 300℃ in slurry bed residue oil hydrogenation units   6.  Systematic industry impact   Environmental benefits: Wastewater treatment pumps (such as Wilo's 144 submersible mixers) help Zhuyuan Sewage Plant increase its daily processing capacity to 3.4 million m³.

This article aims to introduce the performance of self-priming pumps in more detail and under what working conditions you should choose #self-priming pumps. I hope it will be helpful to you. 1. Comparison between #fluoroplastic self-priming pump and #stainless steel self-priming pump   ①. Fluoroplastic self-priming pump Performance characteristics: Made of PTFE/PP and other materials, resistant to strong acids and alkalis (such as 98% sulfuric acid, 50% hydrofluoric acid) Applicable working conditions: chemical waste acid treatment, electroplating liquid transportation, corrosive media in the pharmaceutical industry Advantages: Corrosion resistance far exceeds that of metal pumps, light weight (30% lighter than stainless steel of the same model) Disadvantages: Upper temperature limit 120℃ (stainless steel can reach 200℃), not resistant to particle wear   ②. #Stainless steel self-priming pump (304/316L) Performance characteristics: high mechanical strength (compressive capacity up to 1.6MPa), can handle media containing trace solid particles Applicable working conditions: food processing (such as sauce transportation), seawater desalination pretreatment, environmental sewage treatment Advantages: good structural stability, long maintenance cycle (bearing life is about 8000 hours) Disadvantages: not resistant to chloride ion corrosion (316L should be used with caution when Cl-＞200ppm)   2. #Fluoroplastic self-priming pump vs #Fluoroplastic centrifugal pump‌   ①. Fluoroplastic self-priming pump‌ Through the gas-liquid separation chamber and reflux hole design, it needs to be filled with liquid once before the first start, and then the air in the suction pipeline can be automatically discharged to form a vacuum (the self-priming height is usually 3-4m) Typical structure: external mixing design, the impeller groove and the volute cooperate to achieve gas-liquid mixing and separation   ②. #Fluoroplastic centrifugal pump‌ Relies on the centrifugal force of the impeller to transport liquid, must be completely filled with liquid and exhausted before starting, no self-priming ability Typical structure: closed impeller + volute flow channel, high requirements for medium purity   ③. Key performance comparison Comparison Items Fluoroplastic self-priming pump Fluoroplastic centrifugal pump Self-priming ability Can handle media with gas content ≤15% It needs to be completely exhausted. When the gas content is >5%, it is easy to cavitation. Startup method No need to repeat the operation after the first filling Each start requires filling and exhaust Efficiency Lower (about 5-8% lower than centrifugal pump) Higher (n can reach more than 70%) Particle resistance Only suitable for media without solid particles Can handle media containing trace particles (≤0.1mm) Installation Requirements No foot valve required (except for special working conditions) Need to install bottom valve or vacuum water diversion device   ④. Typical application scenarios   Preferred working conditions for fluoroplastic self-priming pumps Intermittent operation: such as chemical tank truck unloading, electroplating liquid circulation Large liquid level fluctuations: underground storage tank suction, emergency drainage   Preferred working conditions for fluoroplastic centrifugal pumps Continuous and stable transportation: pickling production line, pure water circulation system High head requirements: chemical process pressurization (head can reach more than 80m)   ⑤. Selection recommendations   Select self-priming pumps: when the working conditions have frequent start and stop, pipeline gas storage risks or the installation position is higher than the liquid level   Select centrifugal pumps: for scenes that pursue high efficiency, large flow stable transportation and can ensure continuous filling   3. Stainless steel self-priming pumps vs. #Stainless steel centrifugal pump   ①.Core differences:   Self-priming ability: The self-priming pump can form a 5m water column vacuum when it is first started (the centrifugal pump needs to be filled with water)   Gas-liquid mixed transmission: The self-priming pump can handle media with a gas content of 15% (the centrifugal pump is limited to 5%)   Efficiency curve: The centrifugal pump is 5-8% more efficient at the rated point, but the self-priming pump is more stable under variable conditions   Installation requirements: The centrifugal pump requires NPSH>3m, and the self-priming pump allows a negative NPSH   ②.Selection suggestions:   Select a self-priming pump for frequent start-stop/liquid level fluctuations (such as unloading oil from a tanker truck)   Select a centrifugal pump for large flow and stable conditions (such as fire water supply system)

Introduction #Fluorine-lined centrifugal pumps are widely used in the transportation of highly corrosive media such as sulfuric acid, hydrofluoric acid, and organic solvents due to the excellent corrosion resistance of PTFE/PFA linings. Mechanical seals are core components for leakage prevention, and their replacement quality directly affects the life and safety of the pump. This article takes three typical media, 98% sulfuric acid, 40% hydrofluoric acid, and mixed organic solvents, as examples to explain the key points of operation.   I. General preparations   1. Safety protection · Wear chemical protective clothing + mask (acidic medium) or organic solvent-resistant gloves (solvents) · Set up a "maintenance" warning sign and confirm that the power supply is double disconnected   2. Pre-processing · Close the inlet and outlet valves and drain the residual medium in the pump (sulfuric acid medium needs to be neutralized and rinsed with sodium carbonate solution) · Use a special fluoroplastic cleaner to wipe the pump cavity to avoid metal tools scratching the lining layer   II. Key points for medium differentiation operation   Case 1: 98% concentrated sulfuric acid medium pump · Special requirements: The sealing surface must be made of silicon carbide, and graphite rings are prohibited (sulfuric acid will cause graphite expansion and failure) · Disassembly tips: ① Loosen the middle bolt of the pump cover first to prevent sudden splashing of sulfuric acid crystals ② Check whether the shaft sleeve has pitting caused by sulfuric acid corrosion, and replace it simultaneously if necessary   Case 2: 40% hydrofluoric acid medium pump · Key steps: ① After disassembly, calcium gluconate gel is needed to neutralize residual fluoride ions ② The static ring must be filled with polytetrafluoroethylene, and the dynamic ring is recommended to be alumina ceramic   Case 3: Acetone/chloroform mixed solvent pump ·Precautions: ① Rubber #O-rings are prohibited, and perfluoroether rubber (FFKM) seals are used instead ② Thoroughly degrease with anhydrous ethanol before installation to prevent the solvent from dissolving the grease and contaminating the sealing surface   III. Standardized process for mechanical seal disassembly   1. Safety preparation stage ·Power off and lock (LOTO), and hang warning signs. ·Close the inlet and outlet valves and drain the medium in the pump (acid medium needs to be neutralized and flushed).   2. Coupling separation   ·Remove the protective cover bolts and use the puller tool to disassemble the coupling (cast iron impellers need to be padded with wooden blocks to prevent cracking)   3. Pump body disassembly ·Symmetrically loosen the pump cover bolts and pull out the motor and impeller assembly as a whole. ·Large pump bodies need to use the pump cover screw holes to push out the impeller   4. Removal of seal assembly   ·Remove the impeller nut with a socket wrench and pull out the impeller axially (threaded impeller needs to rotate counterclockwise)   ·First remove the dynamic ring assembly, and then use non-metallic tools to pry out the static ring (protect the O-ring)   IV. Key steps for mechanical seal installation   1. Pretreatment   ·Clean the shaft sleeve, sealing chamber and new seal with acetone   ·Check that there are no scratches on the mirror surface of the dynamic and static rings and no deformation of the spring   2. Installation of static ring   ·Press the static ring vertically into the sealing chamber to ensure that the anti-rotation pin is in the groove (clearance 0.1-0.2mm)   3. Assembly of dynamic ring   ·Apply silicone grease before the dynamic ring assembly is inserted into the shaft, and adjust the spring compression according to the manufacturer's standard   4. Reinstall the whole assembly   ·After the impeller is installed, manually turn the wheel to check that there is no friction sound   Tighten the pump cover bolts in diagonal order in batches (torque refers to GB/T 16823.1)   V. High-frequency operation risk tips   ·Acid medium pump: HF pump needs to be neutralized with calcium gel after disassembly, and graphite seal is prohibited for sulphuric acid pump ·Solvent pump: FFKM O-ring must be used, and ethanol degreasing must be performed before installation ·Common taboos: It is forbidden to knock on the end face of the static ring, and the dynamic ring should automatically rebound ≥3 times after compression   VI. Test acceptance standards   1. After the point-to-point test is correct, it should run continuously for 30 minutes 2. Leakage control: ·Water medium ≤5 drops/minute ·Corrosive medium ≤3 drops/minute   VII. High-frequency maintenance questions and answers   Q: Why is the double-end face machine seal more recommended for fluorine-lined pumps? A: Isolation fluid can be added to form a protective barrier, which is especially suitable for permeable media such as hydrofluoric acid Q: How to deal with vibration exceeding the standard after the machine seal is replaced? A: First check the dynamic balance of the impeller and the bending of the shaft, and then confirm that the verticality of the static ring installation is ≤0.05mm In summary, the replacement and maintenance of the mechanical seal of the corrosion-resistant pipeline pump is crucial to ensure the normal operation of the equipment. Users must not only master the correct replacement method, but also carefully follow the relevant precautions to extend the service life of the equipment and improve production efficiency.‌

In the chemical, metallurgical, mining and other industries, mortar pumps and magnetic pumps, as core equipment for conveying high-temperature corrosive media, have long faced pain points such as #seal failure, #material corrosion, and #particle wear. Especially when conveying media containing solid particles such as hydrochloric acid, hydrofluoric acid, and strong alkali, traditional mechanical sealing materials (such as alumina ceramics and tungsten carbide) often cause equipment downtime due to insufficient corrosion resistance or poor thermal shock resistance, resulting in huge maintenance costs. This article will analyze the performance advantages of #pressureless sintered silicon carbide (SSIC) materials and explore how it can become the ultimate sealing solution under high-temperature corrosive conditions. Ⅰ. Extreme Challenges of High-Temperature Corrosive Conditions to Sealing Materials 1.1 Typical Failure Scenarios #Mortar Pump: When conveying corrosive slurry with 60% solid content (such as acidic slurry with pH < 2), grooves are formed on the sealing surface due to #abrasive wear and #chemical corrosion, resulting in leakage exceeding the industry warning value of 20mL/h. #High-Temperature Magnetic Pump: When the medium temperature exceeds 180°C, the traditional sealing ring deforms due to the difference in thermal expansion coefficient (such as #tungsten carbide CTE≈5.5×10⁻⁶/°C), causing the sealing surface to be uneven, resulting in the magnetic pump #isolation sleeve rupture or #bearing jamming.     1.2 Performance bottlenecks of traditional materials Ⅱ. Breakthrough performance of pressureless sintered silicon carbide 2.1 Material science advantages Extreme corrosion resistance: The corrosion rate in boiling concentrated hydrochloric acid (37% HCl) is <0.02mm/year (NACE TM0177 standard), and it can operate stably in the full range of pH=0~14, perfectly matching the high chloride medium working conditions of mortar pumps. #High temperature stability: It still maintains a bending strength of >300MPa at 1600℃ (ASTM C1161 test), and the thermal conductivity reaches 120W/m·K (4 times that of #316L stainless steel), which significantly reduces the risk of thermal stress cracking of magnetic pumps under high temperature conditions. #Nano-level sealing surface‌: Through HIP (hot isostatic pressing) densification process, the porosity is <0.1%, the surface roughness Ra≤0.1μm (ISO 4287 standard), and the leakage rate is less than 0.01mL/m·h, which meets the requirements of API 682 Plan 53B sealing system.   2.2 Engineering application verification #Mortar pump case‌: After a copper smelter upgraded the original alumina ceramic seal to SSiC mechanical seal, when conveying #copper concentrate slurry containing 35% H₂SO₄ and 40% solid content, the service life was increased from 42 days to 18 months, saving more than 1.2 million yuan in maintenance costs each year. #Magnetic pump case‌: In the ethylene cracking unit of a petrochemical enterprise, the SSiC seal operated continuously for 26,000 hours without leakage under 320℃ hot oil medium, extending the service life by more than 6 times compared with the traditional solution.   III. Guide to key technical parameters for selection   For different pump types, the following optimized configuration is recommended: IV. Industry Development Trends According to the Grand View Research report, the global #silicon carbide mechanical seal market size will reach US$1.78 billion in 2023, of which the pressureless sintering process accounts for 62%. With the surge in demand for #‌corrosion-resistant magnetic pumps‌ and #‌wear-resistant mortar pumps‌ in emerging fields such as third-generation semiconductor manufacturing and lithium battery slurry delivery, SSiC mechanical seals are becoming the default choice for engineers to cope with extreme working conditions. Conclusion‌ Whether facing the #‌abrasion-corrosion coupling working conditions‌ of mortar pumps or the #‌high temperature and high pressure sealing challenges‌ of #magnetic pumps, pressureless sintered silicon carbide materials have shown disruptive performance breakthroughs. It is recommended that equipment manufacturers focus on the porosity (needed to be <0.5%) and crystal phase purity (β-SiC accounts for >95%) of SSIC when selecting, and jointly conduct ASTM G65 wear simulation tests with seal suppliers to maximize the equipment MTBF (mean time between failures).

CHANGYU's flagship product #Fluorine-lined corrosion-resistant and wear-resistant mortar pump : the ultimate anti-corrosion and wear-resistant solution in the chemical industry in the global chemical, metallurgical, environmental protection and other industries, equipment corrosion and wear problems cause economic losses of up to tens of billions of dollars each year. As a leading company in the field of anti-corrosion pumps, Changyu Pumps and Valves has successfully broken the monopoly of international brands with its independently developed fluorine-lined corrosion-resistant and wear-resistant mortar pumps, and has become the preferred solution in the fields of petrochemicals, flue gas desulfurization, and electroplating wastewater treatment.   ⅠWhy has the fluorine-lined, #corrosion-resistant and wear-resistant mortar pump become a rigid demand in the industry?   According to Grand View Research, the global chemical pump market will reach $68.5 billion in 2023, of which #corrosion-resistant pumps account for more than 40%, with an annual growth rate of 8.3%. Traditional metal pumps generally have problems of short life and high maintenance costs when facing strong acids (such as sulfuric acid and hydrochloric acid), strong alkalis, and media containing solid particles. For example:   ①: A phosphate fertilizer plant used a cast iron pump to transport slurry containing 30% phosphoric acid. The impeller was perforated in just 3 months, and the replacement cost exceeded 120,000 yuan/year; ②: The desulfurization system of a coastal power plant used a #316L stainless steel pump, which frequently shut down due to chloride ion corrosion, affecting power generation efficiency.   ⅡThe core technical advantages of CHANGYU #fluorine-lined pump   ①：Quadruple protection technology, lifespan increased by 5-8 times Lining material: modified #fluorinated ethylene propylene (FEP) material, with a thickness of 8-10mm, a temperature range of -85℃~150℃, and can withstand strong corrosive media such as 98% concentrated sulfuric acid and hydrofluoric acid (key technology for chemical pump selection); ·Wear-resistant structure: The impeller adopts a semi-open design + back auxiliary blades to reduce particle blockage; the surface hardness of the flow-through parts reaches HRC65, which is 3 times more wear-resistant than traditional rubber linings; ·Patented seal: Containerized double-end mechanical seal (API 682 standard), equipped with PLAN54 flushing system, leakage rate <0.1ml/h; ·Modular design: The pump body and bearing bracket are standardized, and the maintenance time is shortened by 70%.   ②：Measured performance comparison   Ⅲ Classic application scenarios and customer cases ①：Flue gas desulfurization system (working principle of desulfurization pump) ·Customer: A nickel smelter in Indonesia ·Working conditions: Processing desulfurization slurry containing 15% gypsum, pH=2.5, temperature 80℃ ·Solution: Configure #200UHB-ZKD-350-32 fluorine-lined pump, flow rate 350m³/h, head 32m ·Effect: Continuous operation for 18 months without major repairs, energy consumption reduced by 22%, replacing the original American brand pump   ②：Electroplating wastewater reuse  ·Customer: A circuit board company in Guangdong ·Problem: Chromium-containing wastewater caused corrosion and leakage of 304 stainless steel pump within 3 weeks ·Renovation plan: Use CHANGYU #50UHB-ZKD-20-30 small fluorine-lined pump, equipped with #frequency conversion control ·Results: Wastewater recovery rate increased from 60% to 92%, saving more than 800,000 yuan in annual reagent costs   Ⅳ Selection Guide: How to match the best working conditions?   ①: Customers should pay attention to the following when purchasing fluorine-lined pumps:   · Medium characteristics: pH value, temperature, solid content (core parameters for mortar pump selection); · Flow head: It is recommended to reserve 10%~15% margin (refer to HI 9.6.7 specification); · Quality certification: ISO or CE quality certification is required; · Service support: CHANGYU provides free quotation + selection plan + model + structure diagram.   ②: As of 2024, Changyu Pumps and Valves has provided more than 120,000 fluorine-lined equipment to the world, thanks to:   · Technical barriers: 17 invention patents, participated in the drafting of the national standard "#Corrosion-resistant Plastic Centrifugal Pump"; · Data verification: (mean time between failures) test up to 28,000 hours;   If you need a customized solution, please contact the CHANGYU engineer team - let corrosion and wear become history, starting with choosing a real ace pump.

Stainless steel high temperature magnetic pumps (high temperature magnetic pumps, corrosion resistant magnetic pumps) are widely used in chemical, pharmaceutical, electroplating and other industries. Their leak-free, high temperature and corrosion resistant characteristics make them an ideal choice for conveying hazardous media. This article provides a detailed magnetic pump selection guide, covering the comparison of pump types under different working conditions (such as high temperature, strong acid, and medium containing particles). 1. Pump type selection under different media and temperature conditions [Stainless steel magnetic pump, chemical pump selection]   Stainless steel high-temperature magnetic pumps are widely used in chemical, pharmaceutical, electroplating and other industries due to their excellent corrosion resistance and high temperature resistance. For different working conditions and media, the following factors should be considered when selecting:   ①. Medium characteristic selection [acid and alkali resistant pump, high-temperature medium transportation]   ·Corrosive media: Select 316L or 904L stainless steel material, 904L has better tolerance to strong acids and alkalis.   ·High-temperature media: Standard type can be selected below 200℃, and high-temperature special type needs to be selected for 200-350℃. ·Particle-containing media: Standard type can be selected for particle content <5%, wear-resistant type or larger gap design needs to be selected for >5%.   ·Easy to crystallize media: Models with insulation jackets should be selected to prevent the medium from crystallizing in the pump.   ②. Comparison of working conditions of magnetic drive pump and leakage-free pump 2. Detailed explanation of technical parameters of mainstream models [Magnetic pump parameters Pump performance curve]     ①. Models and parameters of chemical pumps such as CQB and IHF ②. Key performance parameters ·Flow rate: Select according to process requirements, it is recommended to leave a 10-15% margin ·Lift: Consider pipeline loss and vertical lifting height ·Temperature: The actual working temperature should be lower than the rated temperature of the pump by more than 20°C ·Power: Adjust according to the specific gravity and viscosity of the medium, high viscosity medium requires increased power.   3. Professional selection steps and usage suggestions   ①. Five-step selection method · Clearly define the characteristics of the medium: including composition, concentration, temperature, viscosity, particle content, etc. · Determine process parameters: flow, head, inlet and outlet pressure, etc. · Select materials: Select the appropriate stainless steel grade according to the corrosiveness of the medium · Consider special needs: such as explosion-proof, aseptic, wear-resistant and other special requirements · Check supporting equipment: motor power, cooling system, control system, etc.   ②. Key points for the use and maintenance of magnetic pumps · Installation: Ensure that the inlet has sufficient net positive suction head (NPSHa) · Before starting: The pump must be primed and dry operation is strictly prohibited · During operation: Monitor the bearing temperature, which should not exceed the ambient temperature +70℃ · Shutdown maintenance: The medium should be drained for long-term shutdown to prevent crystallization or corrosion ③. Common selection errors · Ignoring the impact of medium temperature changes on pump performance · Underestimating the pipeline resistance and resulting in insufficient head · Ignoring the correction of medium viscosity to pump performance · Selecting too large a safety margin leads to energy waste   Through the above guidelines, users can choose the most suitable stainless steel high-temperature magnetic pump model according to specific working conditions and medium characteristics to ensure long-term stable operation of the equipment and improve production efficiency. It is recommended to consult professional technicians or pump manufacturers before the final selection to obtain more accurate selection suggestions.

Stainless steel has become one of the most commonly used materials in pump manufacturing due to its excellent corrosion resistance and mechanical properties. This article focuses on the application of several common stainless steel materials in pumps, analyzes their chemical composition differences, mechanical performance characteristics and applicable working conditions, and provides a reference for users to select models. 1. "The most familiar friend": 304 stainless steel (06Cr19Ni10) Chemical composition and characteristics 304 stainless steel is the most commonly used austenitic stainless steel, and its typical chemical composition is: · Chromium (Cr): 18-20% · Nickel (Ni): 8-10.5% · Carbon (C): ≤0.08% · Manganese (Mn): ≤2.0% · Silicon (Si): ≤1.0% · Phosphorus (P): ≤0.045% · Sulfur (S): ≤0.03% a、Mechanical properties ·Tensile strength: ≥515 MPa ·Yield strength: ≥205 MPa ·Elongation: ≥40% ·Hardness: ≤201 HB b、Applicable working conditions 304 stainless steel has good corrosion resistance and formability, and is suitable for: ·General corrosive media: such as dilute nitric acid, organic acids, etc. ·Temperature range: -196℃ to 800℃ (short term) Due to the properties of 304 stainless steel, it is commonly used in: drinking water systems, food processing, and chemical industries for the transportation of weakly corrosive media. c. 304 stainless steel has limitations in use ·Not resistant to chloride corrosion (such as seawater and salt water)   ·Prone to stress corrosion cracking in sulfur-containing environments 2. "A Warrior Who Rejects Corrosion": 316 Stainless Steel (06Cr17Ni12Mo2) Chemical Composition and Characteristics 316 stainless steel is an upgraded version of 304, with the addition of molybdenum: · Chromium (Cr): 16-18% · Nickel (Ni): 10-14% · Molybdenum (Mo): 2-3% · Carbon (C): ≤0.08% The remaining elements are similar to 304, and the corrosion resistance is greatly improved. a、Mechanical properties ·Tensile strength: ≥515 MPa ·Yield strength: ≥205 MPa ·Elongation: ≥40% ·Hardness: ≤217 HB b、Applicable working conditions Compared to 304 stainless steel, 316 has better corrosion resistance due to the addition of molybdenum: · Chloride environment: more resistant to seawater and salt water corrosion than 304 · Strong acid environment: better resistance to sulfuric acid, phosphoric acid, etc. · Temperature range: -196℃ to 800℃ (short term) Therefore, it is commonly used in: moderately corrosive media in seawater desalination, pharmaceutical, and chemical industries c、Advantages ·Higher pitting equivalent PREN value (about 25, 304 is about 19) ·More resistant to crevice corrosion and stress corrosion cracking 3. "Special Forces Specialized in Solving Difficult Problems": 316L Stainless Steel (022Cr17Ni12Mo2) Chemical Composition and Characteristics 316L is an ultra-low carbon version of 316: Carbon (C): ≤0.03% (significantly lower than 0.08% of 316) The remaining components are basically the same as 316 a、Mechanical Properties ·Tensile Strength: ≥485 MPa ·Yield Strength: ≥170 MPa ·Elongation: ≥40% ·Hardness: ≤217 HB b、Applicable Working Conditions The low carbon content makes it more suitable for: ·Welding applications: reduce carbide precipitation in the heat affected zone of welding ·High temperature corrosion environment: more resistant to intergranular corrosion in the range of 450-850℃ ·Highly corrosive media: such as concentrated nitric acid, organic acids, etc. c、Common Applications Nuclear industry, fine chemicals, high temperature corrosion environment d、Special Advantages ·No annealing required after welding ·More stable in long-term high temperature environment 4. "The Smooth Socialite": Duplex Stainless Steel 2205 (022Cr23Ni5Mo3N) Chemical Composition and Characteristics Duplex stainless steel has both austenite and ferrite structures: · Chromium (Cr): 22-23% · Nickel (Ni): 4.5-6.5% · Molybdenum (Mo): 3.0-3.5% · Nitrogen (N): 0.14-0.20% · Carbon (C): ≤0.03% a、Mechanical Properties · Tensile Strength: ≥620 MPa · Yield Strength: ≥450 MPa (significantly higher than austenitic stainless steel) · Elongation: ≥25% · Hardness: ≤290 HB b、Applicable working conditions 2205 duplex stainless steel is particularly suitable for: ·High chloride environment: high concentration chloride solutions such as seawater and brine ·High stress environment: applications requiring high strength ·Environment where corrosion and wear coexist: such as media containing solid particles ·Temperature range: -50℃ to 300℃ ·Common applications: offshore oil platforms, chemical process pumps, desulfurization systems c、Outstanding features of 2205 duplex stainless steel ·PREN value up to 35-40 ·Excellent resistance to stress corrosion cracking ·Good wear resistance and fatigue strength 5. "Challenger in extreme environments": Super austenitic stainless steel 904L (015Cr21Ni26Mo5Cu2) Chemical composition and characteristics Super austenitic stainless steel with high alloy content: · Chromium (Cr): 19-23% · Nickel (Ni): 23-28% · Molybdenum (Mo): 4-5% · Copper (Cu): 1-2% · Carbon (C): ≤0.02% a、Mechanical properties · Tensile strength: ≥490 MPa · Yield strength: ≥216 MPa · Elongation: ≥35% · Hardness: ≤220 HB b、904L applicable working conditions 904L is suitable for extremely corrosive environments: 1. Strong acid environment: concentrated sulfuric acid, phosphoric acid, etc. 2. Complex mixed media: media containing multiple corrosive components 3. High temperature corrosive environment: up to 400℃ Because of these characteristics, 904L is commonly used in: chemical industry strong corrosive media transportation, flue gas desulfurization system, pharmaceutical industry, etc. c、Special advantages ·Good corrosion resistance to both reducing and oxidizing media ·Excellent resistance to pitting and crevice corrosion 6. Purchase considerations 1. Medium characteristics: pH value, chloride ion content, oxidizing/reducing properties 2. Temperature range: operating temperature and fluctuation range 3. Mechanical requirements: pressure, flow rate, whether it contains solid particles 4. Economic efficiency: balance between initial cost and service life Buyers can consult the manufacturer or make inquiries based on this information. 7. Scope of application and application recommendation 8.Conclusion The selection of stainless steel materials for pumps requires comprehensive consideration of media characteristics, working environment and economic factors. The 304/316 series is suitable for most general corrosive environments, titanium-stabilized stainless steel is suitable for high-temperature applications, and duplex stainless steel and super austenitic stainless steel are for more demanding working conditions. The correct material selection can not only extend the service life of the stainless steel pump, but also reduce maintenance costs and ensure safe and stable operation of the system. It is recommended that users consult professional technicians when selecting and make a decision after a detailed working condition analysis.

Caustic soda (sodium hydroxide) is an important raw material in the chemical industry, but its strong corrosiveness poses a challenge to transportation equipment. Traditional metal pumps are prone to corrosion and have a short lifespan, while fluoroplastic centrifugal pumps are an ideal solution due to their excellent corrosion resistance and reliability. This article focuses on analyzing their application advantages.   1. Challenges and industry pain points of caustic soda transportation   Caustic soda (sodium hydroxide) is a strong alkaline substance, which is extremely corrosive at a concentration of 30%-50%. According to the National Association of Corrosion Engineers (NACE), in the chemical industry, equipment damage caused by corrosion accounts for about 35% of all equipment failures, of which alkaline medium corrosion accounts for 18%. The service life of traditional 304/316 stainless steel pumps when conveying caustic soda is usually no more than 6 months, while cast iron pumps corrode faster.   Industry pain points are mainly manifested in:   · High costs caused by frequent equipment replacement · Safety hazards caused by leakage risks · Loss of production efficiency caused by downtime maintenance · Medium pollution affects product quality 2. Core advantages and technical analysis of fluoroplastic centrifugal pumps 2.1 Excellent corrosion resistance   a. Fluoroplastic centrifugal pumps use PTFE (polytetrafluoroethylene) or PVDF (polyvinylidene fluoride) as the main material. Experimental data show:   ·PTFE material has an annual corrosion rate of <0.01mm under 50% caustic soda concentration and 80℃ ·PVDF material has an annual corrosion rate of <0.05mm under 40% caustic soda concentration and 60℃ Compared with stainless steel materials (annual corrosion rate>1mm), the corrosion resistance is improved by more than 100 times   b. Material selection guide:   ·Normal temperature (<60℃), medium and low concentration (<30%): PVDF material has a higher cost performance ·High temperature (>60℃), high concentration (>30%): PTFE material is better ·PFA (soluble polytetrafluoroethylene) material can be considered for special working conditions   2.2 Advanced sealing technology   a. Fluoroplastic centrifugal pump adopts double-end mechanical seal system, with the following characteristics:   Seal life: up to 8000-10000 hours   Leakage rate: <0.5ml/h (much higher than API682 standard)   Auxiliary system: optional flushing, cooling and other devices   b. Sealing configuration recommendations:   Standard working conditions: single-end mechanical seal   Hazardous media: double-end mechanical seal + isolation liquid system   Particle-containing media: carbide sealing surface   2.3 Optimized hydraulic design   a. Through CFD fluid dynamics simulation optimization, modern fluoroplastic centrifugal pumps have the following features:   Efficiency improvement: 15-20% higher than traditional design Energy consumption reduction: more than 30% energy saving under typical working conditions NPSHr value: can be as low as 2m, effectively avoiding cavitation   b. Performance curve features:   Flat Q-H curve, suitable for flow fluctuation conditions Wide high-efficiency zone, flow range of efficiency>75% up to 40% Low specific speed design, suitable for high head requirements   3. Fluoroplastic centrifugal pump purchase guide   3.1 Comparison of well-known brands 3.2 Key parameters for purchase Flow range: 0.5-500m³/h Lift range: 5-80m Temperature range: PVDF: -20℃~90℃ PTFE: -50℃~150℃ Pressure level: PN6-PN16   3.3 Key points for supplier evaluation Qualification certification: ISO9001, API685, etc. Project cases: Application experience in the same industry R&D capabilities: Number of patented technologies After-sales service: Response time, spare parts inventory   4.Typical application cases    Case 1: A chlor-alkali enterprise in Hubei   Problem: The original stainless steel pump corroded and perforated in 3 months Solution: Use PTFE-lined centrifugal pump Effect: Extended service life to 4 years, reduced maintenance cost by 70%   Case 2: A pharmaceutical factory in Zhejiang   Requirement: Transport 40% NaOH, temperature 65℃ Selection: PVDF material, double-end seal Operation data: Continuous operation for 18 months without failure   5. Maintenance and maintenance recommendations   a. Daily inspection: Vibration value: <4.5mm/s (ISO10816 standard) Bearing temperature: <75℃ Seal leakage: Visual inspection   a. Regular maintenance: Every 2000 hours: Check the mechanical seal Every 5000 hours: Replace the bearing lubrication Grease Every year: comprehensive disassembly and inspection c. Fault handling: Flow rate drop: check impeller wear/blockage Abnormal vibration: check alignment/bearing status Seal leakage: check seal surface wear.   Sixth, industry development trend a. Intelligent direction: Equipped with IoT sensors to monitor operating status in real time Predictive maintenance system to reduce unexpected downtime   b. Material innovation: Nano-modified fluoroplastics to improve mechanical strength Composite materials application to optimize cost performance   c. Energy efficiency improvement: IE4 ultra-high energy efficiency motor matching Continuous optimization of hydraulic model   Conclusion Fluoroplastic centrifugal pumps have become the preferred equipment for conveying highly corrosive media such as caustic soda due to their excellent corrosion resistance, reliable sealing technology and high efficiency and energy saving. When choosing, it is recommended that users compare the technical characteristics and service capabilities of different brands according to specific working conditions and choose the most suitable products. With the advancement of materials science and manufacturing technology, fluoroplastic centrifugal pumps will play an important role in a wider range of chemical fields and provide strong guarantees for the safe and efficient operation of process industries.