Method for recovering lithium from hydrochloric acid desorption solution

By reacting hydrochloric acid desorption solution with sodium hydroxide precipitation and carbonizing with carbon dioxide, the problem of lithium resource waste after lithium-type chelating resin saturation was solved, achieving efficient lithium recovery and cost reduction.

CN117049578BActive Publication Date: 2026-02-06BAIYIN ZHONGTIAN CHEM
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Patent Information

Application Number
CN202311182230.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-09-14
Publication Date
2026-02-06
Estimated Expiration
2043-09-14

AI Technical Summary

Technical Problem

In existing technologies, lithium-type chelating resins require hydrochloric acid to desorb divalent or higher metal ions such as calcium, magnesium, and iron after they become saturated during the purification process. This results in the hydrochloric acid desorption solution containing a large amount of lithium resources, increasing operating costs.

Method used

A precipitation reaction is carried out by mixing hydrochloric acid desorption solution with sodium hydroxide to generate a water-insoluble hydroxide precipitate. Impurity ions are then removed by solid-liquid separation. Carbon dioxide is then introduced to carry out a carbonation reaction to convert lithium into lithium carbonate. Finally, lithium carbonate product is obtained by pyrolysis and drying.

Benefits of technology

It effectively removes calcium, magnesium, and iron impurity ions from hydrochloric acid desorption solutions, enabling efficient recovery of lithium resources, reducing equipment load and operating costs, and enhancing enterprise competitiveness.

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Abstract

The present application belongs to the technical field of waste resource recycling, and particularly relates to a method for recovering lithium from waste liquid. The method comprises the following steps: mixing hydrochloric acid desorption liquid and sodium hydroxide to perform a precipitation reaction, reacting the sodium hydroxide with impurities in the hydrochloric acid desorption liquid to generate precipitates insoluble in water, and then performing solid-liquid separation, so as to remove calcium, magnesium, iron and other impurity ions in the waste liquid and obtain an alkali metal solution; then, carbon dioxide is introduced into the alkali metal solution to perform carbonization and pyrolysis, and lithium resources in the solution are chemically transformed into lithium carbonate, so as to recover the lithium resources. The method for recovering lithium from hydrochloric acid desorption liquid provided by the present application effectively extracts lithium resources from hydrochloric acid desorption liquid which needs to be discharged to a sewage treatment station by an enterprise, and converts the lithium resources into lithium carbonate raw materials for producing high-purity industrial product lithium fluoride, thereby effectively reducing the operating cost of the enterprise and enhancing the competitiveness of the enterprise in the lithium fluoride market.
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