The filter press pump is a crucial component used in filter press operations to separate solid particles suspended in a liquid, exerting pressure to facilitate filtration. This article will introduce the working principle of the filter press pump and provide a selection guide to assist users in choosing the appropriate pump for their needs.

1. Working Principle

The filter press pump typically generates pressure by compressing air or liquid medium to gradually expel the liquid suspended on the filter cloth, thus achieving solid-liquid separation. Its working principle can be divided into several steps:

Filling Stage: At the start of operation, the filter press pump delivers the mixture suspended on the filter cloth into the filter press.

Compression Stage: The filter press pump generates pressure by compressing air or liquid medium, causing solid particles to gradually settle on the filter cloth, forming a filter cake.

Liquid Discharge Stage: With increasing pressure, the liquid on the filter cake is forced out through the pipeline, while solid particles remain on the filter cloth.

Pressure Release Stage: When the pressure reaches a set value or filtration is complete, the filter press pump ceases operation, and the pressure is released, allowing the solid particles forming the filter cake to be removed, completing the filtration process.

2. Selection Guide

Choosing the right filter press pump involves considering several key factors:

Flow Rate Requirements: Select the appropriate pump type and specifications based on the flow rate requirements of the filter press operation and liquid processing.

Pressure Requirements: Consider the pressure range required during filter press operation and select a pump capable of meeting these requirements.

Fluid Characteristics: Understand the nature of the processing liquid, including viscosity, concentration, particle size, etc., to choose pump materials and structures resistant to corrosion and wear.

Operating Environment: Take into account the pump's operating environment, including temperature, humidity, safety requirements, etc., and select the appropriate protection level and materials.

3. Common Pump Types

Common types of filter press pumps include:

Screw Pump: Suitable for handling high viscosity and solids-laden liquids, with stable flow and pressure output.

Diaphragm Pump: Capable of dry self-priming, suitable for handling corrosive media and volatile liquids.

Plunger Pump: With high-pressure output and precise flow control, suitable for high-pressure filtration operations.

The filter press pump plays a crucial role in solid-liquid separation processes, and selecting the right pump type and specifications can improve filtration efficiency, reduce energy consumption, and ensure equipment safety. By understanding the working principle and selection guide of the filter press pump, users can better apply and maintain the pump, achieving stable and efficient production.