Method and device for extracting ultrapure lithium carbonate from industrial-grade lithium carbonate

Abstract

The invention relates to a method for extracting ultrapure lithium carbonate from industrial-grade lithium carbonate. The method comprises the following steps: A, preparing a lithium hydrogen carbonate solution; B, performing ion exchange impurity removal; C, performing impurity removal on an ion exchange resin regeneration solution; D, performing lithium hydrogen carbonate heating decarbonization: heating the lithium hydrogen carbonate solution subjected to ion exchange impurity removal, so as to convert lithium hydrogen carbonate into lithium carbonate precipitates, and filtering the solution to obtain the lithium carbonate precipitates and a separate solution; E, concentrating the separate solution in Step D to obtain the lithium carbonate precipitates and a separate solution; F, adding an impurity removal reagent into the separate solution in Step E to remove sulfate radical and borate ions, filtering to obtain precipitates and a separate solution, and returning the separate solution as a pulping raw material. The method comprises few34 procedures, and is pollution-free, and a lithium utilization rate is high.

Description

technical field [0001] The invention relates to a method and a device for extracting ultra-purity lithium carbonate from industrial grade lithium carbonate. Background technique [0002] With the application of electronic products and the promotion of electric vehicles, the demand for lithium carbonate as a raw material for lithium batteries is increasing day by day. [0003] Russian patent document RU2243157 provides a method for extracting extra-purity lithium carbonate from industrial-grade lithium carbonate, which includes mechanically activating and crushing industrial-grade lithium carbonate, and using carbon dioxide at 5-25°C and 0.5 atmospheric pressure to decompose the carbonic acid after mechanical activation. The lithium slurry is carbonized and stirred until a lithium bicarbonate solution is obtained, the lithium bicarbonate solution is filtered, the impurity is removed using a synthetic cation exchange resin whose composition is vinylpyridine or sulfonic acid or...

AI Technical Summary

Problems solved by technology

The technical solution of this patent can obtain high-purity lithium carbonate, but cannot obtain ultra-purity lithium carbonate, and the processing steps are complicated and unfriendly to the environment

[0005] Russian patent RU2564806 also provides a similar solution, but it also has the same disadvantages as the above-mentioned solution: that is, the steps are complicated, the efficiency is low, the utilization rate of lithium is low, and it is not friendly to the environment

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