Phosphogypsum-based fluorine adsorbent, preparation method thereof and application thereof in fluorine-containing wastewater treatment

By preparing phosphogypsum-based multi-metal doped fluorine adsorbents, the problems of low adsorption capacity and resource utilization in fluorine pollution control have been solved. This has enabled efficient fluoride ion adsorption and closed-loop resource recycling, reducing the pressure of solid waste storage and the risk of waste liquid discharge, and improving the fluorine resource recovery rate.

CN122399735APending Publication Date: 2026-07-17HUBEI THREE GORGES LAB
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HUBEI THREE GORGES LAB
Filing Date
2026-04-08
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing fluorine pollution control technologies suffer from low adsorption capacity, frequent regeneration, high operating costs, and the inability to recover fluorine resources. The storage of phosphogypsum and the discharge of phosphorus-containing wastewater pose environmental risks. Existing fluorine adsorption materials are costly and lack resource utilization pathways. Granulation technology is prone to causing pore structure collapse.

Method used

Using phosphogypsum and phosphorus-containing waste liquid as raw materials, a high-performance fluorine adsorbent is prepared through co-conditioning-co-crystallization-defect pre-enrichment, functional partition doping and neutral silica sol bonding-segmented calcination technology. This results in the formation of an asymmetric particle structure with a high-strength surface and porous interior, achieving synergistic optimization of adsorption performance. The adsorption products are then recycled back to phosphorus chemical production in a closed loop.

Benefits of technology

It achieves highly efficient fluoride ion adsorption with high adsorption capacity, strong structural stability, and a wide applicable pH range, reducing the pressure of solid waste storage and the risk of waste liquid discharge, improving the fluoride resource recovery rate and reducing operating costs.

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Abstract

本发明公开了一种磷石膏基氟吸附剂及其制备方法与含氟废水处理中的应用。将磷石膏与含磷废液分别进行预处理，得到精制磷石膏与预处理磷源；将精制磷石膏与预处理磷源混合，通过水热合成反应制备羟基磷灰石材料；向所得羟基磷灰石材料中引入多元金属离子进行掺杂改性；将掺杂改性后的材料与无机粘结剂、成型助剂混合造粒，经分段煅烧，得到磷石膏基氟吸附剂。该吸附剂具有高比表面积（≥50 m2 / g）、高抗压强度（≥30 MPa）、宽pH适应性（2~10）及高氟饱和吸附量（≥30 mg / g）。吸附产物氟磷灰石（FAP）中氟含量达3.5%~5.2%，显著高于天然磷矿，补充10%~50%天然磷矿回用于湿法磷酸生产时，可同步提升氟副产物回收率（≥90%）并降低酸耗5%~12%。
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