Purification method in process of production of high-pure quartz sand as raw material of quartz glass

Abstract

The invention discloses a purification method in the production of high-purity quartz sand applied to the raw materials of quartz glass. Through effectively eliminating hydroxyl group and gaseous-liquid inclusion in a natural quartz, the raw material of the quartz glass hyphen, the high-purity quartz sand produced by a common vein quartz, is realized, thereby achieving the effective control to key quality indexes such as air bubbles and air lines in a quartz glass product, and breaking the high dependency to the quality of an ore in the prior process art, so that the availability of vein quartz resources in a quartz glass industry is improved to above 80 percent from about 5 percent; the content of the high-purity quartz sand SiO2 produced by the common vein quartz ore reaches above 99.99 percent; and the total amount of the foreign impurities of thirteen metallic elements is less than 25 to 30 ppm.

Description

technical field [0001] The invention relates to a purification method, in particular to a purification method applied in the production of quartz glass raw material-high-purity quartz sand. Background technique [0002] Quartz glass is an industrial glass composed of pure quartz, which is softened and shaped at high temperature with high-purity quartz sand as the only raw material. Quartz glass is a basic material for cutting-edge technology and emerging industries. It is widely used in advanced electric light sources, electronics, semiconductors, communications, thermal instruments, laboratory instruments, optics, chemicals, national defense, metallurgy, electrical and other industries and fields. Affect the development of national defense technology and national economy. Therefore, all major countries have listed high-purity quartz sand as an important strategic material. [0003] The quality requirements of the quartz glass industry for its raw material high-purity quar...

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Problems solved by technology

At the same time, in the current process of prospecting and processing, it is very difficult to judge whether the ore can be used as a raw material for quartz glass in terms of the bubble gas line of the product. It is necessary to make high-purity quartz sand and then produce quartz glass products to make a preliminary judgment. Do it once The production test of continuous fused quartz tube requires more than 300 kg of high-purity quartz sand for continuous production for more than ten hours. The loss can reach tens of thousands of yuan. Due to the instability of the quality of natural mineral resources and the complexity of detecting the content of hydroxyl groups and gas-liquid inclusions in raw ores, ore quality fluctuations cause heavy losses and even bankruptcy of enterprises.