In modern industrial production, calcium carbonate is an important chemical raw material widely used in industries such as rubber, plastics, papermaking, and coatings. The solid-liquid separation process is crucial for the production of both heavy and light calcium carbonate. The plate and frame filter press has become an equipment in the production process of calcium carbonate due to its efficient and stable performance.

Overview of Calcium Carbonate Production Process

The production process of calcium carbonate is mainly divided into two types: heavy calcium carbonate and light calcium carbonate. Heavy calcium carbonate is obtained from natural ores through physical methods, and after crushing, grinding, grading, and other steps, the final product that meets the requirements is obtained. Light calcium carbonate, on the other hand, is produced through chemical methods by reacting lime milk with carbon dioxide to form a precipitate, which is then processed through filtration, washing, drying, and other procedures.

In the production of light calcium carbonate, the suspension after carbonization reaction contains a large amount of water and a small amount of unreacted impurities, which must be treated by efficient solid-liquid separation equipment. The plate and frame filter press plays a key role in this process, effectively separating solid and liquid calcium carbonate, improving product purity and production efficiency.

Application process of plate and frame filter press in calcium carbonate production

The application of plate and frame filter press in the production of calcium carbonate mainly includes the following steps:

1. Suspension pretreatment
   The calcium carbonate suspension after carbonization reaction is first stirred and preliminarily settled, causing most of the particles to settle down and form a concentrated suspension. This step helps to reduce the load of subsequent filtration and improve filtration efficiency.

2. Feed and filtration
   The preprocessed suspension is pumped into the filtration chamber of the plate and frame filter press. Under the action of the filter cloth, solid particles are trapped to form a filter cake, while liquid is discharged through the filter cloth. This process achieved the initial separation of calcium carbonate from the liquid.

3. Pressing and dehydration
   As the thickness of the filter cake increases, the filtration resistance also increases. At this point, the filter cake is pressed by applying external pressure to further reduce its moisture content. The moisture content of the pressed filter cake is significantly reduced, making it easier for subsequent drying treatment.

4. Filter cake washing and drying
   If product purity needs to be improved, the filter cake can be washed to remove residual impurities on the surface. After washing, the filter cake is dried to obtain lightweight calcium carbonate products that meet quality requirements.

5. Unloading and equipment cleaning
   The dried filter cake is discharged through the discharge device, and the filter cloth needs to be cleaned to ensure the smooth progress of the next filtration. High pressure water flushing or mechanical scraping are common cleaning methods.

Advantages and maintenance points of plate and frame filter press

The advantages of plate and frame filter press in the production of calcium carbonate are mainly reflected in the following aspects:

• High filtration accuracyBy selecting the appropriate filter cloth, it is possible to intercept micron sized particles and ensure product purity.

• AdaptableCan handle suspensions of different concentrations, suitable for acidic or alkaline environments.

• Low moisture content of filter cakeThe pressing function can significantly reduce the moisture content of the filter cake and reduce the energy consumption in the drying process.

To ensure long-term stable operation of the equipment, attention should be paid to daily maintenance:

• Regularly inspect the filter cloth and filter plate, and replace damaged parts in a timely manner.

• Keep the hydraulic system oil level normal to avoid insufficient pressure affecting the filtration effect.

• When the equipment is not in use for a long time, the filter plate should be loosened to prevent deformation.

Conclusion

Plate and frame filter press plays an important role in the production of calcium carbonate. Its efficient solid-liquid separation capability not only improves product quality, but also optimizes the production process. With the continuous advancement of technology, plate and frame filter presses will continue to provide more efficient and energy-saving solutions for the calcium carbonate industry, helping enterprises achieve a win-win situation of environmental protection and economic benefits.