Impurity removal process for quartz sand

Abstract

The invention relates to a physical impurity removal process for quartz sand. The process takes full consideration of the difference in physical and chemical properties between quartz minerals and co-existing impurity minerals, avoids the process unfavorable for the production of high-purity quartz sand in the impurity analysis process of quartz ores, and adopts a pure-physical method to effectively remove impurity minerals in the quartz sand. The quartz ores naturally produced are subjected to the impurity analysis process to obtain the raw material quartz sand with qualified particle size, and the raw material quartz sand is subjected to the mineral separation and impurity removal process to obtain the quartz sand product; all separate impurity minerals as well as most of the impurity minerals co-existing with quartz are completely removed from the product; and a qualified raw material is provided for the subsequent process in the production of high-purity quartz sand.

Description

technical field [0001] The invention relates to a process for physically removing impurities from quartz sand. Background technique [0002] High-purity quartz sand is the only raw material for the production of high-quality quartz glass used in high-tech fields such as optical fiber communications, electronics, semiconductors, solar energy, lasers, and aerospace. The high-purity quartz sand produced by Ming (UNIMIN) company is the standard, and its IOTA-CG grade is the lowest-end product. The total amount of metal element impurities is 22ppm±, that is, the content of impurity elements in 1 ton of quartz sand must be less than 22 grams to achieve high purity. Quartz sand standard. High-purity quartz sand is produced from natural quartz ore. Quartz ore contains a large amount of impurity minerals, mainly mica minerals and feldspar minerals. In the production of high-purity quartz sand, the first step is to remove quartz Almost all impurity minerals in sand, for this reason,...

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Problems solved by technology

However, in this way, the so-called eutectic phenomenon will occur when quartz minerals are symbiotic with feldspar, mica and other minerals. The initial melting temperature of the mixed system can be reduced to about 700°C, while the current roasting temperature for quartz ore is generally 900°C. In this way, the ore after roasting has been partially melted, and the vitreous quality formed by melting will be firmly covered on the quartz surface, which is difficult to remove. Because these vitreous substances contain a large amount of metal element impurities, they are high-purity The production of quartz sand poses difficult problems

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