Filter Press

What is a Filter Press?

A filter press is an industrial solid–liquid separation machine used to remove suspended solids from a liquid by applying pressure through a series of filter plates and filter cloths.

It is one of the most common technologies for producing a relatively dry filter cake from a slurry.

How does a filter press work?

The basic process is:

Slurry → Pump → Filter chambers → Filtration → Cake formation → Cake discharge

1. Slurry feeding 
   • A slurry containing liquid + solid particles is pumped into the filter press under pressure. 
2. Filtration 
   • The slurry enters chambers formed between filter plates. 
   • The filter cloth allows liquid to pass through but retains the solid particles. 
3. Cake formation 
   • Solids accumulate on the cloth and form a filter cake. 
   • As the cake becomes thicker, filtration resistance increases. 
4. Filtrate collection 
   • The clarified liquid passes through the cloth and exits through internal channels in the plates. 
5. Cake dewatering 
   • Depending on the design, additional pressure can be applied using: 
     • Feed-pump pressure 
     • Membrane squeezing 
     • Air blowing 
   • This reduces the moisture content of the cake. 
6. Cake discharge 
   • The plates are opened and the solid cakes fall or are mechanically removed. 

Main components

A typical filter press consists of:

 Filter Press Applications

Filter presses are used whenever a process produces a solid-containing slurry that needs to be separated into a liquid and a solid cake.

1. Cement industry
2. Mining and mineral processing
3. Metallurgy

4. Steel industry

5. Chemical industry

6. Food and beverage industry

7. Ceramic industry

8. Wastewater treatment