Method for comprehensive utilization of phosphorus and lithium elements in biphosphonolite

Through the methods of pressure leaching and chemical precipitation purification and impurity removal, the problem of low utilization rate of phosphate aluminum lithium ore resources has been solved, and efficient separation of phosphorus, aluminum and lithium has been achieved, which has improved resource utilization and economic value and reduced environmental pollution and energy consumption.

CN116986615BActive Publication Date: 2025-10-24SICHUAN COMPLIANCE LITHIUM MATERIAL TECH CO LTD
View PDF -1 Cites 0 Cited by

Patent Information

Application Number
CN202310509726.7
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-05-08
Publication Date
2025-10-24
Estimated Expiration
2043-05-08

AI Technical Summary

Technical Problem

The existing technology for processing lithium aluminum phosphate ore is backward and the lithium extraction process is not yet mature, resulting in low resource utilization and serious environmental pollution.

Method used

The method of direct pressure leaching of raw ore and purification and impurity removal by chemical precipitation is adopted. By controlling the pH value and temperature, phosphorus, aluminum and lithium are separated and extracted, and the lithium hydroxide crystallization mother liquor is recycled to reduce costs and improve product purity.

Benefits of technology

It achieves efficient separation of phosphorus, aluminum and lithium, improves resource utilization, reduces energy consumption and environmental pollution, increases economic value, and has high added value products with a short process flow and easy industrialization.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN116986615B_ABST
    Figure CN116986615B_ABST
Patent Text Reader

Abstract

The application discloses a method for comprehensive utilization of phosphorus, aluminum and lithium in a lithiophosphate mineral, and comprises the following steps: after ball milling, the lithiophosphate mineral is added with water for beating, and nitric acid is added for pressure primary leaching, so that leaching solution I and leaching residue I are obtained; the obtained leaching solution I is beaten with the lithiophosphate mineral, and the slurry is subjected to pressure secondary leaching, so that leaching solution II and leaching residue II are obtained; the leaching solution II is adjusted to a pH of 4-5 for aluminum removal, and after filtration, an aluminum-removed solution and aluminum hydroxide are obtained; the aluminum-removed solution is added with calcium oxide for controlling the pH to 5-8 for phosphorus removal, and after filtration, a phosphorus-removed solution and calcium phosphate are obtained; the phosphorus-removed solution is adjusted to a pH of 11-12 for calcium, magnesium and iron removal, and after filtration, a filtrate is obtained, and the filtrate is subjected to deep impurity removal to obtain an adsorbed solution; the adsorbed solution is subjected to bipolar membrane treatment to obtain nitric acid and lithium hydroxide solution; the lithium hydroxide solution is subjected to negative pressure evaporation concentration and crystallization to obtain lithium hydroxide and a crystallization mother liquor, and the mother liquor can be returned to the impurity removal process for recycling. The application realizes efficient separation of phosphorus, aluminum and lithium, and by-products can be recycled.
Need to check novelty before this filing date? Find Prior Art