Deep impurity removal method for cell-grade lithium chloride

A deep impurity removal and lithium chloride technology, applied in the direction of lithium halide, etc., can solve the problems of fine initial sediment particle size, increased risk of scaling on the inner wall of pipelines and containers, and many times of impurity removal

Active Publication Date: 2018-11-20
湖北金泉新材料有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] 1. Calcium ions and magnesium ions in the solution react with the impurity remover to form precipitates, which need to be separated by filtration. In order to facilitate the treatment of waste residue, these two kinds of precipitates are generally separated by filtration, which leads to high energy consumption and labor intensity.
Chloride ions and lithium ions will also be entrained in the precipitation, which will not only increase the cost of environmental protection but also increase the loss of lithium during waste residue treatment.
[0005] 2. It takes a long time for calcium ions to react with sodium carbonate to form calcium carbonate precipitation, and the initial precipitation particle size is very fine, which is difficult to filter. It takes about ten hours of reaction time to form precipitation grains, and the time cost is huge
[0006] 3. Calcium ions reac

Method used

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  • Deep impurity removal method for cell-grade lithium chloride

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Effect test

Embodiment 1

[0101] Provide the lithium sulfate solution that 8kg spodumene leaching obtains, add 3kg sodium carbonate solution, carry out first filtration separation operation, obtain filtrate, then add 1kg mass fraction in filtrate and be 15% dilute sodium hydroxide solution, adjust pH value To 11, carry out vacuum filtration and separation to obtain the lithium sulfate solution after preliminary impurity removal;

[0102] The pH value of the lithium sulfate solution is adjusted to 12 by a sodium hydroxide solution with a mass fraction of 20%;

[0103] The lithium sulfate solution is flowed through the polystyrene aminophosphoric acid type chelating cation exchange resin column, and the flow time is 15min to obtain a lithium-containing clean solution;

[0104] Put the lithium-containing purified solution into the evaporation crystallization kettle, first turn on the internal circulation mode, then vacuumize, and at the same time slowly heat to evaporate the water in the lithium-containin...

Embodiment 2

[0111] Provide the lithium sulfate solution that 8kg lepidolite leaching obtains, add 4kg sodium carbonate solution, carry out first filtration and separation operation, obtain filtrate, add 2kg mass fraction again in filtrate and be 18% dilute sodium hydroxide solution, pH value is adjusted to 11. Carry out vacuum filtration and separation to obtain lithium sulfate solution after preliminary impurity removal;

[0112] The pH value of the lithium sulfate solution is adjusted to 12 by a sodium hydroxide solution with a mass fraction of 20%;

[0113] The lithium sulfate solution is flowed through the polystyrene aminophosphoric acid type chelating cation exchange resin column, and the flow time is 20min to obtain a lithium-containing clean solution;

[0114] Put the lithium-containing purified solution into the evaporation crystallization kettle, first turn on the internal circulation mode, then vacuumize, and at the same time slowly heat to evaporate the water in the lithium-co...

Embodiment 3

[0121] Provide the lithium sulfate solution that 8kg lepidolite leaching obtains, add 4kg sodium carbonate solution, carry out first filtration and separation operation, obtain filtrate, add 2kg mass fraction again in filtrate and be 18% dilute sodium hydroxide solution, pH value is adjusted to 11. Carry out vacuum filtration and separation to obtain lithium sulfate solution after preliminary impurity removal;

[0122] The pH value of the lithium sulfate solution is adjusted to 12 by a sodium hydroxide solution with a mass fraction of 20%;

[0123] The lithium sulfate solution is flowed through the polystyrene iminodiacetic acid type chelating cation exchange resin column, and the flow time is 20min to obtain a lithium-containing clean solution;

[0124] Put the lithium-containing purified solution into the evaporation crystallization kettle, first turn on the internal circulation mode, then vacuumize, and at the same time slowly heat to evaporate the water in the lithium-cont...

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Abstract

The invention provides a deep impurity removal method for cell-grade lithium chloride. The method comprises the following steps: a lithium-containing solution is subjected to preliminary impurity removal, then pH is regulated to 10-12, the solution passes through a chelating cation exchange resin column, so that bivalent or higher metal cations in the lithium-containing solution are adsorbed, a lithium-containing purified liquid is obtained and is evaporated, crystallized and dried, and cell-grade lithium chloride is obtained; then the chelating cation exchange resin column is replaced with deionized water, pickled with a hydrochloric acid solution and subjected to reacted acid washing with deionized water, alkaline washing with a sodium hydroxide solution and residual alkali washing withthe deionized water sequentially, and the recyclable chelating cation exchange resin column is obtained. According to the deep impurity removal method for cell-grade lithium chloride, deep impurity removal of cell-grade lithium chloride can be completed once, cell grade is reached, precipitates cannot be produced, impurity removal cost and environmental protection risks are reduced, lithium recovery rate is increased, and the chelating cation exchange resin column is recyclable, so that the impurity removal cost is saved.

Description

technical field [0001] The invention relates to the technical field of lithium production, in particular to a deep impurity removal method for battery-grade lithium chloride. Background technique [0002] In the process of using spodumene, lepidolite leached lithium sulfate solution or lithium chloride-containing brine to prepare anhydrous lithium chloride, the current production method is to put calcium chloride solution into the solution or use sodium salt freezing method Obtain the crude lithium chloride liquid, then add impurity remover for many times, filter for many times to remove various impurity ions, and finally evaporate and crystallize to obtain lithium chloride product; or use lithium carbonate and lithium hydroxide to directly react with hydrochloric acid to obtain lithium chloride solution, the lithium chloride product is obtained after evaporation and crystallization. [0003] In the process of producing battery-grade lithium chloride, after obtaining the pr...

Claims

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Application Information

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IPC IPC(8): C01D15/04
CPCC01D15/04C01P2006/80
Inventor 秦晓明王晓荣曾文强骆锦红
Owner 湖北金泉新材料有限公司
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