Fluorine recovery method and recovery device adaptive to high and low fluorine-containing wastewater

By using calcium salts in combination with polyaluminum chloride to adjust the molar ratio and dosage of Ca2+ and Al3+, and combining alkalization and acidification treatments, the problems of fluoride recovery rate and purity in wastewater with high and low fluoride content were solved, realizing an efficient and simple method and device for fluoride recovery.

CN121717518APending Publication Date: 2026-03-24XIAN TPRI WATER & ENVIRONMENTAL PROTECTION
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-26
Publication Date
2026-03-24

AI Technical Summary

Technical Problem

Existing technologies struggle to effectively address the issues of fluoride recovery rate and purity in wastewater with varying fluoride content, especially when fluoride concentrations fluctuate drastically. This results in complex processes, cumbersome operations, and low purity of the recovered products.

Method used

By using calcium salts in combination with polyaluminum chloride, the homogeneous and heterogeneous crystallization modes of calcium fluoride can be switched by adjusting the molar ratio and dosage of Ca2+ and Al3+. High-purity calcium fluoride crystals can be recovered through alkalization and acidification treatment, and the alumina hydroxyaluminate flocs can be recycled.

Benefits of technology

This technology enables efficient fluoride recovery from wastewater with varying fluoride content within the same device, improving the purity and recovery rate of calcium fluoride crystals, simplifying the operation process, and reducing costs.

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Abstract

The invention discloses a fluorine recovery method and recovery device adaptive to high and low fluorine-containing wastewater, and the method is characterized in that free switching between a calcium fluoride homogeneous crystallization mode and a calcium fluoride heterogeneous crystallization mode of the fluorine-containing wastewater is realized by adjusting the dosage and reaction time of calcium salt and polyaluminum chloride, so that the fluorine recovery method can be adaptive to fluorine recovery of wastewater with different fluorine concentrations; afterwards, calcium fluoride crystal products and hydroxyl aluminum oxide flocs are finally obtained through solid-liquid separation, alkalization treatment, acidification treatment and other means, and the hydroxyl aluminum oxide flocs are recycled. According to the method disclosed by the invention, the fluorine in the wastewater with different fluorine concentrations can be recovered by combining the calcium salt and the polyaluminum chloride, and the method is simple in process equipment, simple and convenient to operate, low in cost and high in purity of the recovered product.
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