Diatomite filter aids can be divided into dry products, calcined products and flux calcined products according to different production processes.

① Dried product

The silicon dry soil raw materials purified, pre dried and crushed are dried at a temperature of 600 ~ 800 ° C and then crushed. This product has fine particle size and is suitable for precision filtration. It is often used in combination with other filter aids. Most of the dried products are light yellow, milky white and light gray.

② Calcined product

The purified, dried and crushed diatomite raw material is fed into a rotary kiln, calcined at a temperature of 800 ~ 1200 ° C, then crushed and graded to obtain the calcined product. Compared with dry products, the permeability of calcined products is more than three times higher. Calcined products are mostly light red.

③ Flux calcined product

After purification, drying and crushing, the diatomite raw material is added with a small amount of melting aids such as sodium carbonate and sodium chloride, calcined at 900 ~ 1200 ° C, and the flux calcined product is obtained after crushing and particle size grading ratio. The permeability of flux calcined products is significantly improved, which is more than 20 times that of dry products. Flux calcined products are mostly white, and light pink when Fe2O3 content is high or flux dosage is small.