Method for preparing high-purity quartz sand

Abstract

The invention discloses a method for preparing high-purity quartz sand. The method comprises the following steps of: dividing quartz ore into blocks with size of 30mm*30mm for classification; roughly washing and calcining the quartz ore; calcining the quartz ore twice at the furnace temperature of between 840 and 880 DEG C and at the furnace temperature of between 890 and 910 DEG C; performing water-quenching and pulverizing the quartz ore into quartz sand with particle size of between 0.4 and 0.1mm; placing the pulverized quartz ore sand into a reaction tank; adding ultrapure water with purity level of between 14.5 and 15.5M which is 65 to 75 percent of the volume of the reaction tank, the quartz sand which is 30 to 40 volume percent of the ultrapure water and the mixture of concentratedhydrochloric acid or hydrochloric acid with concentration of 35 to 37 percent and hydrofluoric acid into the reaction tank in turn, wherein based on the ultrapure water, the mixture of the concentrated hydrochloric acid or hydrochloric acid is 5 to 8 volume percent; keeping the temperature of the reaction tank at 60 to 80 DEG C; stirring the mixture in the reaction tank for 20 to 30 minutes, precipitating the mixture for 10 to 15 minutes and then discharging the primary liquid out of the reaction tank; adding a proper amount of ultrapure water again; stirring and cleaning; conveying the mortar of the reaction tank to a cleaning tank; cleaning the mortar in the cleaning tank by using the ultrapure water; performing liquid-solid separation on the quartz ore; drying the quartz ore under the environment with temperature of between 175 and 185 DEG C; and performing magnetic separation, and screening and packaging the quartz ore. Thus, resources are protected and fully utilized, and the maximization of the economic benefit is realized.

Description

1. Technical field [0001] The invention relates to a method for preparing high-purity quartz sand, in particular to a method for preparing high-purity quartz sand suitable for a quartz crucible. 2. Background technology [0002] Quartz glass is widely used in the manufacture of In integrated circuits, the main products of quartz glass are high-purity high-temperature resistant quartz glass tubes for large-scale integrated circuits, arc quartz crucibles (solar grade and semiconductor grade), quartz glass for optical communications and quartz glass for electric light sources. [0003] The main raw material of quartz glass is high-purity quartz sand, which has excellent chemical stability, high insulation and voltage resistance and extremely low volume expansion coefficient. It is an indispensable and important raw material for high-tech industries such as electronic core devices, optical communication materials, and solar cells. It is the basic raw material for the production...

AI Technical Summary

Problems solved by technology

However, compared with foreign enterprises, according to the characteristics of China's industrial development, my country's quartz glass enterprises have a large number of enterprises, small scale, backward equipment and technology, and relatively low variety grades.

In my country, there is no method for preparing high-purity quartz sand with a silicon dioxide content greater than 99.99% from quartz ore.

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