一种高浓度硫酸根存在下含氟废水的结晶除氟方法
By optimizing crystallization conditions and adding composite regulators, lanthanum hydroxide was used for directional crystallization, which solved the problem of low defluorination efficiency under high-concentration sulfate, achieving efficient defluorination and resource recovery, and generating high-purity fluorides.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
- Filing Date
- 2025-09-25
- Publication Date
- 2026-07-17
AI Technical Summary
In environments with high concentrations of sulfate, existing defluorination technologies are inefficient, have poor selectivity, and are difficult to achieve in-depth defluorination and resource recovery.
By optimizing crystallization conditions and adding composite regulators, lanthanum hydroxide is used for directional crystallization, combined with lanthanum fluoride crystal seeds to suppress sulfate interference, thereby achieving efficient fluoride removal and recovery.
Under high-concentration sulfate environment, the fluoride removal efficiency reaches over 90%, and the generated LaF3·xH2O crystals have a purity of 95%. They are then converted into high-value lanthanum fluoride products through stepwise calcination, thus achieving resource recovery.
Smart Images
Figure CN121426329B_ABST