Method for preparing ultra-high purity quartz sand by deep purification

By leveraging the synergistic effect of supercritical carbon dioxide fluid and composite entrainer, along with acid etching and metal complexing agent extraction, the problems of low removal efficiency and high energy consumption of inclusions and crystal structure impurities in ultra-high purity quartz sand have been solved, achieving efficient and controllable impurity removal and environmentally friendly quartz sand preparation.

CN121405101BActive Publication Date: 2026-03-27CENT SOUTH UNIV
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Patent Information

Application Number
CN202511999823.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-12-29
Publication Date
2026-03-27
Estimated Expiration
2045-12-29

AI Technical Summary

Technical Problem

In the preparation of ultra-high purity quartz sand, existing technologies have low removal efficiency and uncontrollable removal degree of inclusions and crystal structure impurities, and the high energy consumption of high-temperature treatment leads to damage to the crystal structure of the material.

Method used

By employing the synergistic effect of supercritical carbon dioxide fluid and composite entrainer, and through acid medium etching and metal complexing agent extraction, efficient and deep removal of impurities and inclusions in quartz crystal structures can be achieved.

Benefits of technology

It achieves efficient and controllable removal of impurities, reduces energy consumption, avoids damage to the crystal structure of materials caused by high-temperature treatment, and the process is simple and environmentally friendly, making it suitable for large-scale industrial applications.

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Abstract

The present application relates to a kind of methods for preparing ultra-high purity quartz sand by deep purification, belong to high-purity quartz high-efficiency preparation and non-metallic mineral fine and deep processing technical field.The method is placed in supercritical reaction device with quartz sand raw material, and mixed fluid of composite entraining agent and supercritical carbon dioxide is introduced into the device to carry out reaction, after separation, washing and drying, high-purity quartz sand product is obtained;The composite entraining agent is the combination of acid medium and metal complexing agent;The volume fraction of the acid medium in the mixed fluid is 0.5%~5%, and the acid medium is hydrogen fluoride and / or hydrogen chloride.The method has the advantages of simple process flow, high purification efficiency, controllable purification degree and stable product performance.
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