Composite fluorine removal agent for deep fluorine removal of water body and preparation method of composite fluorine removal agent

By combining a composite defluorinating agent containing lanthanum, aluminum, and zinc ions with ZnFe2O4 nanoparticles, the problem of traditional defluorinating agents being unable to achieve deep defluorination and rapid sedimentation at low dosages has been solved, achieving a highly efficient and economical deep defluorination effect in water bodies.

CN122276945APending Publication Date: 2026-06-26BLUESTAR LEHIGH ENG INST CO LTD
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Patent Information

Application Number
CN202610474602.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-12
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing defluorination technologies struggle to achieve deep defluorination and rapid sedimentation at low dosages. Traditional single-metal salt defluorinating agents suffer from limited binding capacity, narrow applicable pH range, large sludge volume, and high cost, while rare-earth composite defluorinating agents are expensive, produce small flocs, and have slow sedimentation rates.

Method used

A composite defluorinating agent composed of lanthanum, aluminum, and zinc ions is used. By controlling the pH value within the range of 6.0 to 6.5, a highly reactive hydroxyl complex is generated. Combined with ZnFe2O4 nanoparticles as a magnetic core, a stable MF bond is formed, achieving rapid flocculation and magnetic sedimentation.

Benefits of technology

At a low dosage (1.2 mmol/L), the fluoride ion concentration can be reduced to below 1.0 mg/L, and the rapid magnetic settling time is completed within 5 minutes, which significantly reduces treatment costs and sludge production and shortens the water treatment cycle.

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Abstract

The invention discloses a composite fluorine removal agent for deep fluorine removal of a water body and a preparation method thereof, the fluorine removal agent is a metal salt aqueous solution or a metal salt aqueous solution dispersed with nanoparticles, the active components of the fluorine removal agent at least comprise three metal ions of lanthanum, aluminum and zinc, the molar ratio of La to Al to Zn is (1-4): (3-5): (1-3), and the pH value of the aqueous solution is 6.0-6.5. Compared with the traditional PAC which can reduce the fluorine ions to 1mg / L only by adding more than 5mmol / L, the composite fluorine removal agent disclosed by the invention can reduce the fluorine ions to 1.0 mg / L or below only by adding 1.2 mmol / L (based on the total concentration of active components), so that the treatment cost and the sludge yield are greatly reduced; in addition, the settling speed is high, solid-liquid separation can be achieved within 10 minutes, magnetic suction settling can be completed within 5 minutes in a preferable scheme containing nano-particles, and the water treatment process period is greatly shortened.
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