A method for mass production of low-iron quartz dry sand

Abstract

The invention relates to a method for mass production of low-iron quartz dry sand. A track point distribution type artificial sorting system selects the raw ore to obtain type A / B / C ores and tailings;the type A / B ores are subjected to three-level crushing, grinding and blocking process in order to control the coarse particles, and then are sorted by the layered dilution and the multi-level magnetic separation joint recovery technology, namely that most impurities such as mechanical iron in the ores are sorted at a high concentration; through layered supplement of clear water and large-proportion dilution of the pulp concentration, the magnetic ores are thoroughly dispersed and picked out by strong-magnetism magnetic separation; in graded sand setting, by adopting a novel anion-cation collector as a flotation reagent and optimizing the parameters of the fluoride-free flotation technology, the Fe2O3 index of the fine sand of the type A and B ores is controlled to 30ppm or less; the floatation fine sand is scrubbed by a proper amount of water to meet the requirement of low halogenation; then through dehydration, anti-pollution drying and dry magnetic separation, an aim of 30ppm low-iron quartz dry sand of a silica raw material for preparing optical glass, crystal items and electronic-grade silica powder is achieved finally.

Description

technical field [0001] The invention relates to a mineral processing method of siliceous raw material quartz sand used for optical glass, crystal ornaments and electronic-grade silicon micropowder in inorganic non-metallic materials, in particular to a method for mass production of low-iron quartz dry sand. Background technique [0002] Quartz sand is the main raw material used in float glass, flat glass, glassware, optical glass, crystal ornaments, electronic grade silica powder and other fields. According to its different uses, different quality requirements are put forward for quartz sand. [0003] As a key core component of optical instruments, optical glass is the main medium material for optical transmission. Its physical properties determine the core performance of optical instruments. The high performance requirements for optical glass make it possible to process optical glass with quartz sand technology. The index requirements are extremely strict, usually SiO 2 &...

AI Technical Summary

Problems solved by technology

Under the requirements of green water and green mountains and maintaining the ecological environment, the acid leaching process or the flotation process using hydrofluoric acid as an inhibitor can no longer meet the requirements of the times.

However, the production of low-iron quartz sand suitable for high-end fields such as optical glass, crystal jewelry, and electronic-grade silica powder produced by non-acid washing and fluorine-free technology is less, and the market gap is huge.

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