10% Sulfuric Acid Chemical Pump Selection

 

For selecting a chemical pump for conveying 10% sulfuric acid (iron-nickel aqueous solution), considering process parameters, material requirements, and potential risks, the following is a detailed analysis and optimization suggestions for the CQB150-125-400FA magnetic drive pump:

 

I. Core Parameter Matching Verification

* Flow Rate and Head

* Recommended Model Flow Rate: 200 m³/h (Meets requirements ≥150 m³/h, with a 25% margin to handle fluctuations).

* Head: 50 m (Precisely matches process requirements, avoiding system efficiency reduction due to insufficient head).

* Conclusion: Parameters are perfectly matched, no adjustment required.

* Temperature Adaptability

* Pump Design Temperature Resistance: ≤100℃ (Perfectly matches solution temperatures of 90-100℃).

* Note: If the temperature approaches the 100℃ upper limit, ensure good heat dissipation of the pump body (e.g., by adding a cooling jacket or forced ventilation) to prevent demagnetization of the magnetic drive component due to overheating.

 

Specific Gravity and Power

 

Current Specific Gravity: 1.2 (Pump allows specific gravity ≤ 1.3, acceptable in the short term).

 

Expected Specific Gravity: 1.6-1.8 (Outside pump design range).

 

Risk: Increased specific gravity will significantly increase motor load, potentially leading to insufficient power or overheating.

 

Solutions:

 

Short-term: Reduce the speed of the variable frequency motor (e.g., from 50Hz to 40Hz) to reduce power demand, but this will reduce flow rate to 160m³/h (still meeting ≥150m³/h).

 

Long-term: Upgrade the motor power to 90kW-4P, or replace with a pump with all-silicon carbide flow components (e.g., CQB-G series) to improve pressure resistance.

 

II. In-depth Analysis of Material Corrosion Resistance

Liner and Flow Components

 

Pump casing liner: ETFE (ethylene-tetrafluoroethylene copolymer), excellent resistance to 10% sulfuric acid corrosion, but long-term contact with high specific gravity solutions may increase the risk of stress cracking. Recommendation: Confirm the ETFE liner thickness (recommended ≥3mm) and processing technology (e.g., spinning is superior to welding). Require suppliers to provide material certification reports (such as ASTM D3307 or ISO 12086).

 

Impeller: ETFE-coated neodymium iron boron magnet (NdFeB), magnetically driven and leak-free, but note that: Neodymium iron boron magnets may demagnetize at high temperatures (>100℃), so it must be confirmed that the actual operating temperature is strictly ≤100℃.

 

Shaft and Bushing: Silicon carbide (SiC), highly wear-resistant, suitable for solutions containing trace amounts of iron-nickel particles, but it is necessary to: Confirm particle size (recommended ≤50μm) and content (recommended ≤0.1%) to avoid large particles accelerating wear.

 

O-ring: FEP (perfluoroethylene propylene) + FKM (fluororubber), reliable double seal, but FKM may harden at high temperatures, so it is necessary to: Confirm the FKM temperature rating (Viton® GLT series recommended, temperature resistance ≤200℃).

 

Housing Material: FC200 (cast iron) with an ETFE liner, offering high structural strength. However, ensure the ETFE coating is free of pinholes (recommended thickness ≥200μm) to prevent external corrosion.

 

III. Structural Advantages and Operational Reliability: Magnetic drive design; Leak-free: Completely eliminates the risk of shaft seal leakage, especially suitable for nickel-containing precious media.

 

Isolation Sleeve: ETFE material, pressure rating ≥1.6MPa (corresponding to a head of 50m + safety margin).

 

Maintenance: Modular design; impeller and shaft sleeve can be replaced individually. However, note that: Replacing silicon carbide components requires specialized tools; it is recommended to stock spare parts and train maintenance personnel.

 

Variable Frequency Motor Compatibility: The 75kW-4P variable frequency motor supports flow regulation, but requires: Configuring inverter protection functions (such as overload and overheat alarms) to prevent motor damage due to increased specific gravity.

 

Confirming the motor's protection rating (IP55 recommended) and insulation class (F class recommended).

 

IV. Potential Risks and Optimization Suggestions

**Risk of Exceeding Specific Gravity Limits:**

Short-term solution: Reduce speed using a frequency converter, but monitor flow rate to ensure it meets process requirements.

Long-term solution: Upgrade to a CQB-G150-125-400 pump (all silicon carbide flow components, allowable specific gravity ≤ 2.0), or contact the supplier to customize a high-specific-gravity pump.

**Impact of Solid Particles:**

If the solution contains iron-nickel particles, it is recommended to:

Install a Y-type filter (mesh size ≥ 100) at the pump inlet to filter large particles.

 

Regularly check shaft sleeve wear (recommended every 3 months).

 

Temperature Fluctuation Management:

If temperature fluctuations > ±5℃, add a temperature sensor and adjust the speed of the frequency converter accordingly (e.g., reduce speed to reduce heat generation when temperature rises).

 

V. Selection Conclusion and Action Recommendations

**Recommended Model:** CQB150-125-400FA pump (short-term use, specific gravity changes need to be monitored). Upgrade Options: If the specific gravity is consistently ≥1.6, it is recommended to replace with a CQB-G150-125-400 pump (all silicon carbide material, permissible specific gravity ≤2.0).

 

Key Requirements: The supplier must provide material certification reports and pressure test data.

 

The contract should clearly specify the warranty period (recommended ≥2 years) and fault response time (e.g., ≤24 hours).

 

Spare Parts Inventory: It is recommended to stock silicon carbide bushings, FEP O-rings, and other easily worn parts.

 

VI. Supplier Consultation Points

Material Upgrade: Inquire whether a fully PTFE-lined pump can be provided (superior corrosion resistance, but higher cost).

 

Customization Services: Can the motor power or pump body structure be adjusted according to the actual specific gravity?

 

Testing and Verification: Requires operational case studies or simulation test reports under similar working conditions.

 

For further optimization of the selection or to obtain a quotation, please contact:

CIXIFM Winny

Email: sales01@cxflowmeter.com

WhatsApp: 008618049841995