The problems of thin mud cake and high moisture content when the frame press mud may be caused by a variety of factors. Here is a detailed analysis of the problem and its possible causes and solutions:

1. Cause Analysis

Sludge properties

Sludge contains impurities: such as soil, slag or other impurities, these impurities will increase the moisture content of the sludge, making the pressure of the mud cake increase during the filtration process, resulting in an increase in moisture content.

Sludge contains hydrophilic groups: the existence of hydrophilic groups on the surface of the sludge will make it difficult for water to be effectively released, which will affect the efficiency of mud pressing and the moisture content of the pressed sludge.

Equipment problem

Insufficient pressure of the filter press: If the pressure of the plate and frame filter press is too low, the mud cake can not be subjected to enough pressure during the extrusion process, resulting in water can not be fully extruded, so that the mud cake moisture content is high and thin.

Filter cloth relaxation or aging: the filter cloth is easy to relax or age after a period of use, which will affect its tightness and stability, resulting in the mud cake becoming thin and sparse during the extrusion process, and the moisture content increases.

Filter material is too fine: if the filter material is too fine, the mud cake is easy to become thin and loose during the extrusion process, resulting in thin cracking of the mud cake and high moisture content.

Improper operation

No sludge conditioner added or improper addition: sludge conditioner can change the surface structure of the sludge, improve the filtration water of the sludge and the rigidity of the particles. If the sludge conditioner is not added or the addition method is improper, it will lead to large sludge floc, easy to block the filter cloth hole, and affect the mud pressing effect.

Uneven mixing: the sludge and the sludge conditioner are not fully mixed and the mixing is uneven, which will also affect the mud pressing effect.

Too long or too short filtration time: too long filtration time may lead to clogging of the filter cloth, affecting the efficiency of mud pressing; If the filtration time is too short, the mud cake may not be fully squeezed and the moisture content will increase.

Improper debugging of equipment

If the newly put into operation of the plate and frame filter press equipment is not properly debugged, it may also lead to high moisture content of the sludge cake.

Two, solution

Improve sludge properties

Pre-treatment of sludge, such as dehydration, drying, curing and other steps to reduce its moisture content and impurity content.

Add a suitable sludge conditioner to change the surface structure of the sludge, improve its filtration water and the rigidity of the particles.

Adjust device status

Periodically check and adjust the pressure of the plate and frame filter press to ensure that it meets the normal operation requirements.

Change or check the filter cloth regularly to ensure its tightness and stability.

Select the appropriate filter material to avoid too fine resulting in thin cracking of mud cake.

Standard operation procedure

Use the plate and frame filter press correctly according to the operating procedures to avoid problems such as insufficient compression force or too long filtration time.

Ensure that the sludge and the sludge conditioner are fully mixed and stirred evenly.

Debugging equipment

For the newly put into production plate and frame filter press equipment, it should be fully debugging and testing to ensure that its components work normally and achieve the best filter press effect.

In summary, for the problems of thin mud cake and high moisture content of plate and frame press, it is necessary to conduct comprehensive analysis and solution from many aspects such as sludge properties, equipment status, operation process and equipment debugging.