Diatomaceous earth filter aid

Diatomaceous earth filter aid is a new and efficient powder filter media. Its uses and advantages than perlite, activated carbon, acid clay, fiber filter cotton filter media a wider range of applications, resulting in solid-liquid separation, filtration rate and improve the clarity, the effect is superb. Diatomaceous earth filter aid is diatomaceous earth as the basic raw material, preprocessing, sorting, batching, calcination and classification of continuous closed process, a new and efficient production and processing of powdered filter media. It can form a rigid lattice structure type cake, make pre-filtered liquid into fine particles gum impurities trapped in the lattice framework. Therefore, good permeability and provides a porous cake structure, its porosity up to 85 --- 95 percent, resulting in solid and liquid separation process to obtain a high flow rate ratio, can filter out fine suspended thereof. Diatomaceous earth filter aid has good chemical stability, in addition to concentrated caustic solution, but can be applied to filter any reliable liquid filtration liquid pollution, are in line with "Food Sanitation Law," the standards. And can be satisfied using the cloth, paper, metal mesh, porous ceramics and other media, in a variety of filter machine can obtain satisfactory filtering effect, and have other filter media (perlite, fiber cotton, etc.) No unmatched superiority. Diatomaceous earth filter aid more widely. In industry for the production of filter material. It is used in the food industry: beer, fruit and sprinkle juice, drinks, syrup, vegetable oil, enzymes, citric acid filtration. In the chemical industry for: dyes, paints, plating, solvents, acids, electrolytes, synthetic resin, chemical fiber, glycerin, latex and other filters. In the pharmaceutical industry for: antibiotics, glucose and traditional Chinese medicine extract filtering. For the environmental aspects of water treatment, urban water, swimming water, sewage and industrial waste water purification. The main advantage of diatomaceous earth filter aid are: good pore structure, adsorption properties and resistance to compression performance, not only make a better flow rate ratio is obtained filtrate body, and can filter out fine suspended solids, ensure the clarification degrees. The main disadvantage of diatomaceous earth filter aid are: 1, the lack of resources diatomaceous earth filter aid. Production diatomaceous earth filter aid needs high quality diatomite diatom content. Although China has abundant resources of diatomite, but the vast majority of low-grade diatomite mine, difficult to meet production requirements; 2, diatomaceous earth filter aid higher production costs. Diatomite production process more complex, coupled with the higher price of high-quality diatomaceous earth mineral resources, the current production cost of domestic diatomaceous earth filter aid has been maintained at a high level; 3, diatomaceous earth filter aid filtration rate is relatively slow , bulk density, its quality often falls short of expectations was added, and will be more costs. Someone wants to develop small bulk density diatomite products, but limited raw material components and structure, has so far not achieved satisfactory results; 4, diatomaceous earth filter aid chemical stability is not very satisfactory. Diatomite iron, calcium content of harmful ingredients is relatively high, and to separate state exists, so the higher the dissolution rate, a lot of drinks, when wine filtration, high iron dissolution will affect the product's taste and flavor. Diatomaceous earth filter aid, mainly through screening effect, depth effect, the role of adsorption of three suspended solids particles in the liquid trapped in the surface of the medium and channel them to achieve the purpose of solid-liquid separation. First, the role of which is a diatomaceous earth screening surface filtration, when the fluid flows through diatomaceous earth, kieselguhr pores smaller than the particle diameter of impurities, such foreign particles can not be trapped down, this effect It is called screening effect. Diatomaceous earth filter aid www.yxgxhg.cn Second, diatomite depth effect depth effect is depth filtration retention effect. When depth filtration, separation occurs only in the medium of the "internal", part of a relatively small foreign particles passing through the filter cake surface is diatomite internal tortuous microporous structure and cake inside finer pores are retained, Such particles are often less than diatomite pores, when the particles hit the walls of the passage, which may flow out, but whether it can achieve this, the decision by the balance on the particle inertia and resistance, Such interception and screening effects are similar in nature, they belong to the mechanical action. The ability to filter out solid particles with substantially only solid particles and the relative size and pore shape. Third, diatomite adsorption adsorption can actually be seen as moving electrical attraction, which mainly depends on the surface properties of the solid particles and diatomaceous earth itself. Diatomite point is negative, the absolute value of a large, effective absorption of positive charge. When those internal pores smaller than the diatomite particles impinging on the internal surface of porous diatomite, attracted by the charge, there is a mutual attraction between the particles form chains corporation adheres to the diatomaceous earth, these They belong adsorption, adsorption complex than the previous two functions. Generally believed that smaller than the pore diameter of the solid particles trapped reason was mainly due to: intermolecular forces (also known as the van der Waals attraction), including a permanent dipole, induced dipole and dipole moment and the existing and potential ion-exchange process.