一种锂云母提锂卤水除氟氯的方法
By using a combination of trioctylmethylammonium sulfate and trioctylmethylammonium chloride as extractants and isooctyl alcohol as a diluent in lithium extraction brine from lepidol, the problem of poor chlorine and fluoride removal in lepidol brine from lepidol was solved, achieving highly selective and low-loss chlorine and fluoride removal and improving the quality of lithium products.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- FENGCHENG JIULING LITHIUM IND CO LTD
- Filing Date
- 2025-10-28
- Publication Date
- 2026-07-17
AI Technical Summary
Existing technologies have limited effectiveness in removing chlorine and fluoride from lithium brine extracted from lepidolite, and introduce other impurity ions, making it difficult to meet increasingly stringent quality requirements for lithium products.
Trioctylmethylammonium sulfate and trioctylmethylammonium chloride were used as a combined extractant, and isooctyl alcohol was used as a diluent. After pretreatment of lithium brine from lepidolite by extraction, the pH value was adjusted to 5-5.5. The formation of BF4- was used to improve the removal rate of fluoride and chlorine, and the extractant was regenerated by back-extraction.
This method achieves highly selective removal of chlorine and fluoride from lithium brine extracted from lepidolite, reduces lithium loss rate, improves the purity and quality of lithium products, and reduces equipment corrosion risk.
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