Method for extracting lithium from clay lithium ore

By adopting roasting and acid leaching treatment in clay lithium ore lithium extraction technology, combining ammonium carbonate solution reaction and porous alumina separation membrane, the problems of lithium loss and high production costs are solved, and lithium-aluminum separation and effective utilization of waste are achieved. Meet environmental protection requirements.

CN119242947APending Publication Date: 2025-01-03DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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Patent Information

Application Number
CN202411234248.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-09-04
Publication Date
2025-01-03

AI Technical Summary

Technical Problem

The existing clay lithium ore lithium extraction technology has problems such as large loss of lithium, difficulty in purification and removal of leaching liquid, high production costs, difficult to absorb by-products, and difficult to deal with waste gas and waste slag.

Method used

The first calcination and acid leaching treatment were used to obtain the leachate and slag, and then reacted with the ammonium carbonate solution to prepare a gas separation membrane through porous alumina, separate CO2 and NH3 in the exhaust gas, reduce reagent consumption and realize recycling, and combine with neutralization and adsorption process. Realize the separation of lithium aluminum and comprehensive utilization of waste slag.

Benefits of technology

It reduces lithium loss, simplifies the purification process of leaching liquid, reduces production costs, realizes the effective utilization of by-products and waste gas, and meets the environmental protection requirements of clean production.

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Abstract

The invention relates to the technical field of extraction of lithium from lithium ores, in particular to a method for extracting lithium from clay lithium ores, which comprises the following steps: carrying out first roasting treatment and acid leaching treatment on the clay lithium ores to obtain a leaching solution 1 and a leaching residue 1; reacting the leaching solution 1 with an ammonium carbonate solution to obtain a leaching solution 2 and leaching residues 2; the leaching residues 2 are subjected to second roasting treatment and water leaching treatment, and leaching liquid 3 and leaching residues 3 are obtained; carrying out lithium precipitation treatment on the leachate 3 to obtain lithium carbonate; the leaching residues 3 are mixed with basic ionic liquid and resin, a gas separation membrane is prepared, and the gas separation membrane is used for separating CO2 and NH3 generated by the reaction of the leaching liquid 1 and the ammonium carbonate solution. The method can solve the ubiquitous problems of high lithium loss, high difficulty in purification and impurity removal of the leachate, high production cost, difficulty in absorption of by-products, difficulty in treatment of waste gas and waste residues and the like existing in the existing clay lithium ore lithium extraction technology.
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