Method for deeply removing fluid inclusion in quartz sand through molten salt electrolysis

By using molten salt electrolysis and acid washing processes, lithium-based electrolytes are used to break down fluid inclusions in quartz sand under an electric field, solving the problems of low removal efficiency and high energy consumption in traditional methods. This achieves deep purification of high-purity quartz sand with a purity of over 99.998%.

CN122276764APending Publication Date: 2026-06-26HUBEI THREE GORGES LAB
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Patent Information

Application Number
CN202610350077.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-20
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing technologies are ineffective at removing tiny fluid inclusions from quartz sand, resulting in low purity of high-purity quartz sand. Furthermore, traditional methods are energy-intensive and have low removal efficiency.

Method used

The process employs a combination of molten salt electrolysis and acid washing. Microcracks are generated by rapid cooling after high-temperature calcination. Electrolysis is then performed using a lithium-based electrolyte under an electric field. DC pulse voltage breaks down the inclusions, and impurities are thoroughly removed through mixed acid washing.

Benefits of technology

With low energy consumption, deep purification of quartz sand was achieved, with a purity of over 4N8, effectively removing tiny fluid inclusions and improving the quality of high-purity quartz sand.

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Abstract

The invention discloses a method for deeply removing fluid inclusion in quartz sand through molten salt electrolysis, and belongs to the technical field of quartz sand purification. The method comprises the following steps: by taking vein quartz as a raw material, carrying out crushing, screening, magnetic separation and flotation, and then carrying out high-temperature calcination-ice water shock cooling pretreatment, so that micro-cracks are generated on the surface of quartz sand; preparing a molten salt electrolytic tank in a dry nitrogen atmosphere by taking nickel alloy as a cathode, graphite as an anode and lithium electrolyte salt as electrolyte, putting the pretreated quartz sand near the cathode, applying 2-24V direct current pulse voltage to electrolyze for 2-30 minutes, and performing dielectric breakdown and rupture on the fluid inclusion and driving foreign ions to directionally migrate by utilizing an electric field; and finally, washing with boiling water, leaching with mixed acid, washing with water and drying to obtain the high-purity quartz sand with SiO2 purity not lower than 4N8. Through the synergistic effect of thermal burst and molten salt electrolysis, the problem that micro-fluid inclusion is difficult to remove in a traditional method is solved, the energy consumption is low, the purification effect is good, and the prepared high-purity quartz sand can meet the application requirements of high-end industries such as semiconductors and photovoltaics.
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