When using the plate and frame filter press to press mud, there is indeed a mud cake "runny" problem. This usually refers to the presence of non-fully dehydrated areas inside the filtered mud cake, resembling a "runny" shape. The following is a detailed analysis of the problem:

A reason

Pharmaceutical problems:

Choosing the wrong agent type will lead to poor flocculation effect of sludge.

Insufficient amount of additives will lead to poor dehydration effect and high moisture content.

Excessive addition of agents will lead to sticky sludge, adhesion or blockage of filter cloth.

Equipment problem:

Feed pump failure may result in insufficient feed pressure, resulting in slow dehydration.

Problems such as incorrect selection of filter cloth, incomplete cleaning, blockage or short extrusion time will also affect the dehydration effect.

Sludge properties:

The fineness, viscosity or organic matter content of the sludge is too high, resulting in surface and interstitial water difficult to escape.

There were more hydrophilic genes on the sludge surface, and the unmodified sludge surface could not effectively release excess water.

Operation problem:

During the filtration process, if the pressure is insufficient or the filtration time is not enough, it may also lead to the failure to completely dehydrate the inside of the mud cake.

Two, solution

Select the right agent:

Select the appropriate flocculant and conditioner according to the nature of the sludge.

Control the amount of additives to avoid excessive or insufficient.

Optimize equipment configuration:

Ensure that the feed pump is working properly and provides sufficient feed pressure.

Select the appropriate type of filter cloth, and wash and replace it regularly.

Adjusting sludge properties:

The dewatering performance of sludge can be improved by pretreatment or adjusting the pH value of sludge.

Standard operation process:

Filter operation in strict accordance with the operating procedures to ensure sufficient pressure and filter time.

Choose more advanced equipment:

If conditions permit, you can consider using more advanced equipment such as high-pressure diaphragm filter press to improve the dehydration effect.

In summary, there is indeed a mud cake "runny" problem when using the plate and frame filter press to press mud, but this problem can be effectively solved by selecting the right agent, optimizing the equipment configuration, adjusting the sludge properties, standardizing the operation process and selecting more advanced equipment.