Abrasive Slurry Pump Series

(1) Light slurry pump and heavy slurry pump according to the different abrasiveness of the conveying medium, the slurry can generally be divided into strong abrasive slurry and weak abrasive slurry. If the weight concentration of the slurry is C> 20%, solid relative density S> 20, solid particles d> 0.05n boron is a strong abrasive slurry, and other weak abrasive slurry is a weak abrasive slurry. Slurry pumps that transport the above two kinds of slurry are called heavy-duty slurry pumps and light-duty slurry pumps. The conveying medium of coal washing industry belongs to weak abrasive slurry, and the suitable equipment is light slurry pump.
(2) The structural characteristics of light slurry pump and heavy slurry pump The basic structure of heavy slurry pump is double shell, with volute and front and rear pump shell, which belongs to single-stage, single-suction cantilever, horizontal, axial suction radial discharge centrifugal slurry pump. This type of pump has high manufacturing cost and complex maintenance and disassembly.
The basic structure of the lightweight slurry pump is a single shell, only volute, no pump shell, belonging to a single stage, single suction cantilever, horizontal, axial suction radial discharge centrifugal slurry pump. This type of pump has the advantages of simple structure, convenient maintenance and low manufacturing cost.
At present, the heavy-duty slurry pumps developed by CNSME include zJ series slurry pumps, which have been designed and developed and put into production with nearly 100 product specifications, featuring high efficiency, energy saving, high abrasion, reliable operation and long life.

(1) Outlet valve regulation is currently the most commonly used and popular method. A regulating valve is installed on the discharge pipeline of the slurry pump, and the flow rate is adjusted by changing the valve opening. This method is simple and reliable, but it results in significant power loss and poor economic efficiency. It is also ineffective for regulating small or very small flow rates.

(2) Speed regulation, which adjusts flow by changing the rotational speed of the slurry pump impeller. This method has minimal additional power loss and is the most economical approach. However, it requires additional speed-changing mechanisms and motors, resulting in higher initial investment costs. Constant-pressure variable-frequency water supply systems and central air conditioning cooling water circulation systems are two typical examples of variable-frequency speed regulation applied to slurry pump regulation. The method of changing the speed is most suitable for slurry pumps driven by steam turbines, internal combustion engines, and DC motors. Variable frequency regulation can also be used to change the motor speed, and sometimes the speed can be regulated through a hydraulic coupler.

(3) Bypass regulation: This method uses a bypass to divert flow and regulate it, addressing the issue of continuous operation at low flow rates for slurry pumps. However, this results in additional losses due to the diverted flow not being fully utilized, and the process piping also increases accordingly.

(4) Cutting the impeller outer diameter: Adjusting the slurry pump flow rate by cutting the impeller outer diameter results in minimal power loss. However, once the impeller is cut, it cannot be restored, meaning flow rate adjustment is only possible toward lower flow rates. Additionally, the amount of impeller cutting is limited, resulting in a limited flow rate adjustment range. This method is suitable for applications requiring long-term operation at relatively low flow rates with minimal flow rate changes.

(5) Replacing the impeller of the slurry pump: Replacing the impeller with one of a different diameter or outlet width to adjust the flow rate of the slurry pump results in minimal power loss. However, multiple impellers of different diameters must be stocked, and the range of flow rate adjustment is limited.

(6) Blocking part of the impeller flow channel: Reducing the flow rate of the slurry pump by blocking part of the impeller flow channel is equivalent to throttling regulation via an outlet valve. However, this is an active regulation method that reduces additional energy loss, making it more energy-efficient than throttling regulation via a control valve.

(7) Adjust the outlet angle of the blades. Adjusting the outlet angle of the impeller blades to regulate the flow rate of the slurry pump. This method is commonly used in axial flow slurry pumps.

(8) Cavitation regulation. By altering the inlet pressure of the slurry pump to induce cavitation, the characteristic curve of the slurry pump is modified, thereby adjusting its flow rate. Practice has shown that if cavitation regulation is used appropriately, it does not cause severe damage to the flow passage of the slurry pump; on the other hand, it can automatically regulate the flow rate and reduce the power consumption of the slurry pump.

(9) Increasing or decreasing the number of slurry pumps: This method involves adjusting the flow rate of the slurry pump by increasing or decreasing the number of operating slurry pumps, combined with an appropriate merging method.

1. Poor Exhausting of the PumpAfter a slurry pump has been in operation for a period of time, air or gas may accumulate inside. If this gas is not properly vented, it can affect the pump’s performance and lead to a drop in pressure. The solution is to check whether the exhaust valve is working properly and whether there is any blockage. If a problem is found, clean or replace the valve promptly.

2. Damaged Inlet ValveIf the inlet valve of the slurry pump is damaged, it may also cause insufficient pressure. The solution is to inspect the inlet valve for any damage and replace it if necessary to restore normal pressure.

3. Slurry Concentration Too HighWhen the slurry being pumped has an excessively high concentration, it will negatively impact both flow rate and pressure. To resolve this, adjust the slurry concentration by reducing the solid content to improve fluidity. At the same time, check whether the delivery pipeline is clear or blocked.

4. Impeller WearDuring long-term use or in harsh operating conditions, the impeller may wear down, resulting in a pressure drop. It’s important to inspect the impeller regularly; if significant wear is detected, replace it promptly to ensure normal operation.

ConclusionThere are many possible reasons why a slurry pump might have insufficient pressure. However, with regular inspection and maintenance, most issues can be identified and resolved early. In addition to the causes mentioned above, other factors may also contribute. If problems persist, it’s best to consult professional technicians for repair and diagnostics.


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Excessive vibration and abnormal noise are common operational issues in slurry pump systems. If not addressed promptly, these problems can lead to severe mechanical damage, reduced pump efficiency, and shortened equipment lifespan.

Vibration in slurry pumps is often caused by mechanical misalignment, worn components, improper installation, or imbalance in rotating parts. Understanding the root causes and applying appropriate corrective measures can significantly improve pump reliability and reduce downtime in mining, dredging, and mineral processing operations.

1. Pump and Motor Misalignment
Improper alignment between the pump and motor shaft is one of the most frequent causes of vibration.

Possible Causes



Incorrect installation during assembly



Foundation settlement over time



Coupling wear or improper adjustment



Solutions



Perform precision shaft alignment using laser or dial indicators



Recheck alignment after initial operation



Inspect and replace worn couplings if necessary




2. Worn or Damaged Bearings
Bearings support the rotating shaft. When they wear out or become damaged, vibration and noise increase significantly.

Possible Causes



Insufficient lubrication



Contaminated lubricant



Long-term operation under heavy load



Solutions



Inspect bearing condition regularly



Ensure proper lubrication type and quantity



Replace worn bearings immediately




3. Impeller Imbalance or Damage
The impeller is the main rotating component inside the pump. If it becomes worn, damaged, or clogged with solids, it can cause severe vibration.

Possible Causes



Abrasive slurry wear



Foreign material trapped in the impeller



Uneven erosion of impeller blades



Solutions



Clean the impeller and remove debris



Repair or replace damaged impellers



Use wear-resistant materials when necessary




4. Shaft Bending or Mechanical Contact
A bent shaft or contact between rotating and stationary parts may also create vibration and noise.

Possible Causes



Excessive mechanical load



Improper installation



Pump running under abnormal conditions



Solutions



Inspect the shaft for bending



Check internal clearances between components



Replace damaged parts if necessary




5. Weak or Unstable Pump Foundation
An unstable foundation may amplify normal operating vibrations.

Possible Causes



Improper installation base



Loose anchor bolts



Structural resonance



Solutions



Reinforce the pump base structure



Tighten all anchor bolts



Install vibration dampers if necessary




Excessive vibration and noise in slurry pumps usually indicate underlying mechanical or installation issues. Early diagnosis and corrective actions are essential to prevent severe equipment failure.
Regular inspection, proper installation, and routine maintenance can effectively reduce vibration problems and ensure stable operation of slurry pump systems.