Processes for preparing and purifying quartz sand and quartz powder and products thereof

Abstract

The invention discloses processes for preparing and purifying quartz sand and quartz powder and products thereof. The process for preparing and purifying quartz sand comprises the following steps: carrying out rough concentration on vein quartz green ores, crushing, roasting, quenching with water, grinding and grading, carrying out high-gradient magnetic separation, carrying out a complex reaction by using drugs, carrying out floatation, carrying out electrostatic separation, washing with deionized water, and drying to obtain the product. The process for preparing and purifying quartz powder comprises the following steps: carrying out rough concentration on vein quartz green ores, crushing, roasting, quenching with water, grinding and grading, carrying out high-gradient magnetic separation, carrying out a complex reaction by using drugs, treating with microwaves, carrying out electrostatic separation, washing with deionized water, and drying to obtain the product. The quartz sand and the quartz powder produced by using the processes provided by the invention do not bubble in the production process of glass and chips, optical fibers and cables can not break, and the glass does not have water grains. The quartz sand and the quartz powder have widened the application fields, and are applicable to the fields of monocrystalline silicon, polycrystalline silicon, optical fibers and cables, war industry, fine chemical industry and micro-electronics.

Description

technical field [0001] The present invention relates to a preparation and purification process of quartz sand and quartz powder and the products thereof, in particular to a production and purification method of high-purity quartz sand and high-purity quartz powder, so that the products can be used for polycrystalline silicon, single crystal Silicon, optical glass, optical fiber and cable, military industry, electronics, microelectronics, quartz crucible, quartz ingot, quartz rod and packaging of integrated circuits. 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 qu...

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Problems solved by technology

[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, and make water glass Dealkalization, adding oxidizing agent and acid, passing through argon type cation exchange resin to gel the silica aqueous solution, and then washing and roasting to produce synthetic quartz powder; the disadvantage is that the dehydration method is difficult to meet the requirements of a certain water content standard, and some Part of quartz powder is easy to be frozen liquid, poor viscosity, crystal water content, without deionized water washing, the chemical liquid on the surface of quartz powder has a corrosive effect on the equipment, affecting the service life of the equipment, without water crushing, the air bubbles in the quartz powder It is difficult to remove impurities and inclusions, and the chemical liquid attached to the surface has not been removed, which seriously affects the purity requirements, and high pollution, high corrosion, and high cost

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