Production method of silicon dioxide ultrafine powder

Abstract

The invention discloses a production method of silicon dioxide ultrafine powder. The production method comprises the following steps of: performing water ball milling and grinding on a high-quality silica raw material; performing water washing, acid washing, magnetic dressing and centrifugal dehydration; performing ultrafine grinding by using a supersonic air current grinder; separating micro powder out by using a high-speed grading machine; and collecting silicon dioxide micro powder by using a cyclone collector. Key points of the production method are that: the entire process is divided into two parts, wherein the first part is used for removing impurities from the material by performing primary grinding and water washing; and the second part is used for preparing ultrafine silicon powder which is accordant with requirement by performing ultrafine grinding. By adopting the production method, the problems of purity and fineness in the production of the silicon dioxide ultrafine powder are solved. In a previous impurity removing process, water type production is adopted, used waste water can be recycled by secondary treatment and valuable byproducts including ferroferric oxide and the like can be recycled from the waste water. In a next selection process, dry enclosed production is adopted, no waste is discharged, the noise is within the national control standard and the entire process is environmentally-friendly.

Description

Technical field: [0001] The invention relates to a production method of silicon dioxide powder, in particular to a production method of silicon dioxide superfine powder. Background technique: [0002] Silica superfine powder (microsilica powder) is an inorganic material with a wide range of uses. It has physical and chemical characteristics such as high temperature resistance, acid and alkali resistance, excellent dielectric properties, low thermal expansion coefficient, and excellent resonance effect. Therefore, the two Silica powder is widely used in the production of chemical products such as paints, coatings, rubber, plastics, epoxy resins, and advanced ceramics, as well as in the production of electronic and electrical products such as computer chips, optical fibers, and high-voltage electrical materials. The quality of silica powder products not only depends on the content and purity of silica, but also requires the content of special elements such as iron and aluminum...

AI Technical Summary

Problems solved by technology

Due to the complex production process, the chemical method requires special equipment, large investment, high production cost, and is easy to cause environmental pollution

There are two kinds of physical production methods: dry method and wet method. The purity of ordinary dry method is not easy to control, and there is pollution. The ordinary wet method requires long precipitation time and low efficiency, which cannot meet the needs of large-scale production.

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