Reasons Why the Filter Cake Cannot Fall Off Automatically

Nowadays, many filter presses are already very mature filtering equipment in terms of technology and working principles, but there are also some problems. For example, the filter cake cannot fall off automatically after filtration, and it often sticks to the filter cloth of the filter press. The specific reasons need to be analyzed according to the specific situation. The following will analyze the reasons why the filter cake of the filter press cannot fall off automatically.

Operational Issues

The pressure and filtration time of the sludge plate and frame filter press are not accurately controlled, resulting in the filter cake not being pressed well and making it difficult to fall off. It is necessary to be familiar with the operation and master certain rules, such as what kind of material is filtered, how much pressure is more appropriate, and how long the filtration time is required to press the filter cake well.

Solution: Standardize the training of operators to ensure that they have sufficient professional knowledge and operational capabilities.

Filter Cake Characteristics

The particles are small and the viscosity is too high. If the suspension contains a large number of fine particles or highly viscous substances (such as clay, silt, starch, etc.), the filter cake is easy to adhere to the filter cloth and is difficult to fall off naturally.

Solution:

Adjust the use of flocculants or filter aids to make the particles easier to aggregate and reduce the adhesion of the filter cake.
Appropriately increase the feed pressure to improve the structural strength of the filter cake and make it easier to peel off.

The High Moisture Content of Filter Cake

When the moisture content of the filter cake is high, the texture is soft and easy to adhere to the filter cloth, making it difficult to form a complete and dry filter cake.

Solution:

Appropriately extend the filtration time to improve the dehydration effect.
Use high-pressure air blowing or diaphragm pressing to improve the dryness of the filter cake. Filter cloth factors

Filter Cloth is Clogged or Aged

After long-term use, the pores of the filter cloth may be clogged, affecting the discharge of the filtrate and making the filter cake more difficult to peel off.

Solution:

Clean the filter cloth regularly to prevent residues from clogging the pores of the filter cloth.
Replace aging or damaged filter cloth in time to ensure the filtering effect.

Mismatched Filter Cloth Material

If the filter cloth material is not properly selected and does not match the characteristics of the filter medium, it may lead to increased filter cake adhesion.

Solution:

Choose a suitable filter cloth material (such as polypropylene, polyester, or hydrophobic filter cloth).
Use coated filter cloth or surface-treated filter cloth to reduce filter cake adhesion.

The Filtration Cycle is Too Short

If the filtration time is too short and the filter cake is not fully formed, it may cause adhesion problems.

Solution:

Appropriately extend the filtration time to allow the filter cake to form a more complete structure.
Observe the filtrate flow rate to ensure that the filtration process is stable.

Environmental Factors

High humidity or large temperature changes may affect the shedding performance of the filter cake. For example, a high-humidity environment may cause the filter cake to stick, while a low temperature may cause the filter cake to freeze on the filter cloth.

Solution:

In a high-humidity environment, increase air purge or heating functions to reduce the moisture content of the filter cake.
In a low-temperature environment, take heating measures (such as heating the filter plate or adjusting the feed temperature).

Conclusion

The inability of the filter cake to fall off autonomously is mainly related to the properties of the filter cake, the condition of the filter cloth, and environmental factors. For different reasons, measures such as optimizing feed, adjusting pressure, and replacing filter cloth can be taken to improve the shedding of the filter cake. If the problem persists, it is recommended that a comprehensive analysis be conducted to find the best solution.

Reasons Why the Filter Cake Cannot Fall Off Automatically