Filtration is a very common physical treatment method used to remove insoluble substances from liquids. Due to the fact that the solid substances in liquids are often particles that are fine, amorphous, sticky, and easy to block the filter cloth holes, if filtered separately, problems such as difficulty in filtration and unclear filtrate often arise, which cannot be applied in practice. If a filter aid is added to the solution or a layer of filter aid is pre coated on the surface of the filter cloth, it can significantly improve this situation. The filtration speed is fast, the filtrate is clear, and the filter residue is relatively tight, which can detach from the filter cloth. The most commonly used filter aid in various industries is diatomaceous earth. That is what we often refer to as diatomaceous earth filter aids.

Diatomaceous earth filter aid is a new type of high-efficiency powdered filter medium produced and processed using diatomaceous earth as the basic raw material through continuous closed processing processes such as pre-treatment, sorting, batching, calcination, and grading. It can form a rigid lattice structure filter cake, which can intercept small particles in the pre filtration liquid into colloidal impurities on the lattice skeleton. Therefore, it has good permeability and provides a porous filter cake structure, with a porosity of 85-95%, which can achieve a high flow rate ratio in the separation process of solid and liquid, and can filter out fine suspended solids. Diatomaceous earth filter aids have good chemical stability and can be reliably applied to the filtration of any liquid except for concentrated caustic solution. They are non polluting to the filtered liquid and comply with the standard requirements of the Food Hygiene Law. And it can be used satisfactorily on media such as filter cloth, filter paper, metal wire mesh, porous ceramics, etc. It can achieve satisfactory filtering effects on various filter machines and has the advantages of other filtering media. The application of diatomaceous earth filter aids is becoming increasingly widespread. Used in industry to make filter materials. Used in the food industry for filtration of beer, fruit sprinkles, fruit juices, various beverages, syrups, vegetable oils, enzyme preparations, citric acid, etc. Used in the chemical industry for filtration of dyes, coatings, electroplating, solvents, acids, electrolytes, synthetic resins, chemical fibers, glycerol, emulsion, etc. Used in the pharmaceutical industry for filtering antibiotics, glucose, and traditional Chinese medicine extracts. In terms of environmental protection, it is used for water treatment to purify urban water, swimming water, sewage, industrial wastewater, etc.

1、 Diatomaceous earth filter aid: It is a type of diatomaceous earth filter aid produced through drying, calcination, destruction, and grading, which can be used for various liquid-solid separations. Different types of diatomaceous earth filter aid are selected for different liquid-solid separations. Widely used in planning. Many categories use the porous structure of diatomaceous earth and silica shells. During processing, attention must be paid to maintaining the structure and unique shape of diatomaceous skeletons, carefully selecting suitable crushing and grinding equipment and technical conditions, and maintaining the integrity of diatomaceous structure as much as possible to prevent secondary fragmentation. The commonly used grinding equipment is an airflow breaker.
2、 The three important functions of diatomaceous earth filter aid are: 1. Screening effect. This is a surface filtration effect. When a fluid flows through diatomaceous earth, the pores of diatomaceous earth are smaller than the particle size of impurity particles, so impurity particles cannot pass through and are intercepted. This effect is called screening effect. 2. During deep filtration, the separation process occurs inside the medium, with some of the smaller particles passing through the surface of the filter cake being blocked by the pores inside the diatomaceous earth. The ability to filter out solid particles is basically related to the size and shape of the solid particles and pores.
3、 Adsorption refers to the formation of chain clusters between particles attracted by opposite charges, thereby firmly adhering to diatomaceous earth.