Process for preparing and purifying quartz sand and quartz powder and products thereby

Abstract

The invention discloses a process for preparing and purifying quartz sand and quartz powder and products thereby, which consists of quartz ore selection, squashing, water selection, sintering, water disintegrating, oxalic acid or citric acid immersing, dry grinding or wet grinding, magnetic selection, fractionation, floating selection, deionized water washing, special type drying and vacuum-packing.

Description

technical field [0001] The present invention relates to a preparation and purification process of quartz sand and quartz powder and their products, in particular to a production and purification method of high-purity quartz sand and high-purity ultra-fine quartz powder, so that the products can be used in chips, monocrystalline silicon , fiber optic cable, military industry, fine chemical industry and microelectronics. Background technique [0002] At present, the production and purification process of quartz sand and quartz powder is generally adopted: raw ore roughing→crushing→roasting→water crushing→dry grinding or wet grinding→removing iron to make 10-325 mesh quartz sand; or: quartz Raw ore roughing→ordinary water washing→dry grinding or wet grinding→mechanical iron removal→industrial sulfuric acid treatment→mechanical surface modification→drying to make quartz sand and quartz powder of 10-800 mesh; its production and purification process is simple, and it is suitable f...

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Problems solved by technology

[0002] At present, the production and purification process of quartz sand and quartz powder is generally adopted: raw ore roughing→crushing→roasting→water crushing→dry grinding or wet grinding→removing iron to make 10-325 mesh quartz sand; or: quartz Raw ore roughing→ordinary water washing→dry grinding or wet grinding→mechanical iron removal→industrial sulfuric acid treatment→mechanical surface modification→drying to make quartz sand and quartz powder of 10-800 mesh; its production and purification process is simple, and it is suitable for quartz The inclusion impurities and surface impurities and the pollution impurities in the production process cannot be effectively removed, resulting in low purity of quartz sand and quartz powder (the purity of quartz sand is 99.5%-99.6%, and the purity of quartz powder is 99.1%-99.2%) , the fineness of quartz powder is only 800 mesh, it is easy to foam in glass production, and even produce water marks, and it is also easy to foam in the application of casting filler, which affects product quality. It cannot be used in chips, single crystal silicon, optical fiber cables, Applications in military industry, fine chemical industry and microelectronics

[0003] CN1413169A discloses a "synthetic method for silicon dioxide particles, synthetic quartz powder, and synthetic quartz glass", the purpose of which is to provide a method for producing synthetic quartz glass that can efficiently obtain very little silanol group content with high purity; the method It is to dehydrate the hydrous silica gel by freezing, thawing, and removing the water content of the deionized water to obtain silica particles, and then wash and roast the obtained silica particles to make quartz glass powder. Glass dealkalization, adding oxidant and acid, through argon-type cation exchange resin, gels the silica aqueous solution, and then washes and roasts to produce synthetic quartz powder; the disadvantage is that the dehydration method is difficult to meet the requirements of a certain water content standard, Part of the quartz powder is easily viscous by the freezing liquid, has a high water content, and has not been washed with deionized water. The chemical liquid on the surface of the quartz powder has a corrosive effect on the equipment, which affects the service life of the equipment. Without water crushing, the quartz powder in the Bubbles and inclusions are difficult to remove, and the chemical liquid attached to the surface is not removed, which seriously affects the purity requirements