A method for purifying fluorine-containing silicon dioxide co-produced with sodium fluoride

By controlling process parameters through water immersion, hydrofluoric acid treatment, and alkaline reaction steps, the problem of removing sodium silicate impurities in sodium fluoride purification was solved, enabling the preparation of high-purity sodium fluoride, simplifying the process and reducing costs.

CN117361571BActive Publication Date: 2026-07-03GUIZHOU WENGFU LANTIAN FLUORCHEM CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
GUIZHOU WENGFU LANTIAN FLUORCHEM CO LTD
Filing Date
2023-09-14
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

In existing technologies, sodium fluoride purification processes suffer from several problems, including the inability to effectively remove sodium silicate impurities, resulting in low purity; the accumulation of potassium salts in the mother liquor circulation, affecting yield; harsh process conditions; and high production costs.

Method used

The process involves water immersion, hydrofluoric acid treatment, filtration, alkaline reaction, and drying. By controlling process parameters such as temperature and chemical concentration, high-modulus sodium silicate is converted into silicon dioxide using hydrofluoric acid. The silicon dioxide is then treated with NaOH solution to generate water-soluble low-modulus sodium silicate. Finally, high-purity sodium fluoride is obtained through drying.

Benefits of technology

This method achieves efficient removal of sodium silicate and silicon dioxide impurities, improves the purity of sodium fluoride, simplifies the process, reduces production costs, and increases yield.

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Abstract

This application relates to the field of inorganic fluorine chemical technology, specifically disclosing a purification method for the co-production of sodium fluoride from fluorinated silica. The method includes five steps: water leaching, hydrofluoric acid treatment, filtration, alkaline reaction, and drying. Hydrofluoric acid is used to react high-modulus, water-insoluble sodium silicate to generate silica, which is then reacted with an alkaline solution to generate low-modulus, soluble sodium silicate. This method solves the technical problems of low sodium fluoride purity in existing sodium fluoride purification processes without introducing other impurities, including the inability to remove sodium silicate, continuous enrichment with mother liquor circulation affecting yield, harsh process conditions, and high production costs.
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