6/4D-AH vs 4/3C-AH Slurry Pump: How to Choose for Small to Medium Mill Discharge?

Subtitle: A Complete Comparison of Flow, Head, Particle Size, and Operating Cost for Two Classic AH Small-Bore Pumps

Introduction

In small to medium mineral processing plants, mill discharge (ball mill or SAG mill outlet) slurry transport is a critical operation. The 6/4D-AH and 4/3C-AH are two widely used small-bore slurry pumps in the AH series, commonly applied in duties with flow rates of 50–250 m³/h and heads of 10–40 meters. Many users are confused: with similar discharge sizes, which one should you choose?

Choosing the wrong model can lead to higher energy consumption, rapid wear part failure, or even inability to meet mill discharge requirements. As a professional slurry pump manufacturer, this article provides a detailed comparison of the 6/4D-AH and 4/3C-AH pumps from the perspectives of dimensional parameters, hydraulic performance, particle passage, application scenarios, and operating costs – helping small to medium concentrators make accurate decisions.

6/4D-AH

4/3C-AH

1. Model Naming and Basic Dimensions

In AH series naming, the first number represents discharge diameter (inches), and the second number represents inlet diameter (inches). Understanding this rule is the first step in selection.

2. Hydraulic Performance Comparison

3. Application Scenarios

3.1 Suitable Applications for 4/3C-AH

3.2 Suitable Applications for 6/4D-AH

4. Key Selection Factors Comparison

5. Selection Decision Flowchart

6. Case Study: 100 t/h Iron Ore Mill Discharge

Conclusion: Although the 6/4D-AH has about 25% higher initial investment, its lower speed and slower wear result in lower total cost over 3 years compared to the 4/3C-AH.

7. Common Selection Mistakes

Conclusion

Both the 6/4D-AH and 4/3C-AH are excellent choices for small to medium mill discharge, but each has distinct strengths:

• 4/3C-AH is suitable for flow ≤120 m³/h, head ≤35 m, particle size ≤45 mm, budget-conscious or space-constrained projects. It is an economical choice for small ball mill discharge.

• 6/4D-AH is suitable for flow ≥80 m³/h, head up to 45 m, particle size ≤70 mm, and for medium plants pursuing low wear and long life. Though initial investment is higher, the lifecycle cost is lower.

Proper selection requires comprehensive consideration of flow, head, particle characteristics, installation conditions, and long-term operating costs. As a professional slurry pump manufacturer, we offer free selection consulting. Provide your mill discharge parameters for a tailored recommendation.