Process for preparing ultrahigh pure quartz sand through silica raw material

Abstract

The invention discloses a process for preparing ultrahigh pure quartz sand through a silica raw material. The silica raw material is treated in such procedures to produce ultrahigh pure quartz sand with SiO2 content larger than 99.995% as manual sorting, calcining, water quenching, crushing, magnetic separation, electrostatic separation, ultrasonic pickling, flotation, ultrasonic alkali washing, drying, secondary magnetic separation, high temperature chlorination, dehydroxylation treatment and the like, and organic alkali washing, electrostatic separation, secondary magnetic separation, dehydroxylation treatment and high temperature chlorination are particularly added. The process for purifying quartz sand provided by the invention is obvious in effect, high in product purity, low in production cost increase and capable of meeting the requirements of such industrial production on raw materials as quartz glass, etc.

Description

technical field [0001] The invention relates to the field of quartz sand production technology, in particular to a technology for preparing ultra-high-purity quartz sand from silica raw materials. Background technique [0002] Ultra-high purity quartz sand generally refers to SiO 2 Quartz sand with a content higher than 99.99% 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 guides, photoconductive communication materials, and solar cells. Its high-end products are widely used in large-scale integrated circuits, solar cells, optical fibers, lasers, aerospace, military and other industries. The purity of quartz sand and the type and content of impurity elements directly affect the quality of the product. [0003] To obtain high-purity quartz sand, it needs to be purified. At present, the purification pr...

AI Technical Summary

Problems solved by technology

This purification process is relatively simple, and cannot effectively remove the wrapped impurities in the quartz sand, surface impurities, and introduce new impurities during the production process.

In the prior art, there are reports of alkali washing, such as the publication number CN102674376A, the title of the invention is "a production method for the purification of quartz tailings", and the process of alkali washing is introduced, but the alkali added is Na, K hydrogen and oxygen Compounds or carbonate compounds introduce new elemental impurities such as Na and K into the system, which are difficult to remove in subsequent processes