Method for preparation of battery grade lithium chloride from spodumene leachate

A technology of lithium chloride and leaching solution, applied in the direction of lithium halide, etc., can solve the problems of high cost, impurity removal effect, and complicated process

Active Publication Date: 2018-04-20
GANFENG LITHIUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the current method of removing impurities and purifying lithium chloride, it cannot achieve a good effect of removing impurities, and cannot directly produce battery-grade lithium chloride products
The production of high-grade metal lithium is through the purification of metal lithium, or the production of high-purity lithium carbonate and then acidification with lithium carbonate, etc. The process is often complicated and the cost is high

Method used

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  • Method for preparation of battery grade lithium chloride from spodumene leachate
  • Method for preparation of battery grade lithium chloride from spodumene leachate
  • Method for preparation of battery grade lithium chloride from spodumene leachate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] A, adding 2.5g mass percentage concentration to 32% sodium hydroxide solution to adjust the pH value of the solution to 11 in 1L of lithium sulfate spodumene leaching liquid solution with a mass percentage concentration of 10%, warming up to 90°C, after reacting for 0.5h, According to the calculation of the Ca content in the lithium sulfate crude liquid, add 1 g of soda ash solid in an equimolar amount to the Ca content, keep the reaction temperature at 90° C. and react for 0.5 h. After the reaction is completed, filter and separate to remove the iron-magnesium slag to obtain the primary refined lithium sulfate solution 1;

[0054] B, the primary lithium sulfate refining solution 1 obtained by step A is removed Ca ion through chelating resin to obtain secondary lithium sulfate refining solution;

[0055] C, in the secondary lithium sulfate refining solution obtained in step B, according to the molar weight of sulfate radical in the secondary lithium sulfate refining solu...

Embodiment 2

[0061] A. Add 3g of 32% sodium hydroxide solution in 1L of lithium sulfate spodumene leaching solution with a mass percentage concentration of 10%, adjust the pH value to 13, heat up to 95°C, react for 1h, and then react according to lithium sulfate Calculate the Ca content in the crude liquid by adding 1 g of soda ash solid in an equimolar amount to the Ca content, and keep it at 95°C for 1 hour. After the reaction, filter and separate to remove the iron-magnesium slag to obtain a primary refined lithium sulfate solution;

[0062] The primary lithium sulfate refining solution that B, A step obtains obtains secondary lithium sulfate refining solution through chelating resin decalcification;

[0063]C, in the secondary lithium sulfate refining liquid that B step obtains, add barium chloride solid 336g according to the sulfate root molar weight in the secondary lithium sulfate refining liquid in the secondary lithium sulfate refining liquid by barium chloride: sulfate root molar ...

Embodiment 3

[0069] A, adding 2.5g mass percentage concentration to 32% sodium hydroxide solution to adjust the pH value of the solution to 11 in 1L of lithium sulfate spodumene leaching liquid solution with a mass percentage concentration of 10%, warming up to 90°C, after reacting for 0.5h, According to the calculation of the Ca content in the lithium sulfate crude liquid, add 1 g of soda ash solid in an equimolar amount to the Ca content, keep the reaction temperature at 90° C. and react for 0.5 h. After the reaction is completed, filter and separate to remove the iron-magnesium slag to obtain the primary refined lithium sulfate solution 1;

[0070] B, the primary lithium sulfate refining solution that step A obtains obtains secondary lithium sulfate refining solution through chelating resin deionization;

[0071] C, in the secondary lithium sulfate refining solution that step B obtains, according to the molar weight of sulfate in the secondary lithium sulfate refining solution, add bariu...

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Abstract

The invention discloses a method for preparation of battery grade lithium chloride from spodumene leachate. The method includes the steps of: A, adding a sodium hydroxide solution into a lithium sulfate spodumene leachate solution to adjust the PH to 10-13, adding sodium carbonate for reaction, and performing press filtration to obtain a primary lithium sulfate refined solution; B, subjecting theprimary lithium sulfate refined solution to calcium removal by chelate resin to obtain a secondary lithium sulfate refined solution; C, adding barium chloride dehydrate into the secondary lithium sulfate refined solution to obtain a primary lithium chloride solution; D, adding sodium carbonate into the primary lithium chloride solution, and conducting press filtration separation to obtain a secondary lithium chloride solution, and performing acidification and steam stripping to obtain a lithium chloride refined solution; E, conducting triple-effect evaporation on the lithium chloride refined solution to obtain a lithium chloride concentrated solution; F, subjecting the lithium chloride concentrated solution to freezing cooling to precipitate sodium and potassium, thus obtaining a final lithium chloride solution with low sodium and potassium; and G, carrying out concentration and separation on the final lithium chloride solution, and subjecting the obtained solid to drying so as to obtain a battery grade lithium chloride product. The method for preparation of battery grade lithium chloride from spodumene leachate provided by the invention has the characteristics of simple process, high purity of finished product, stable product quality, low cost and high yield.

Description

technical field [0001] The invention relates to a method for preparing battery-grade lithium chloride, in particular to a method for preparing battery-grade lithium chloride from a spodumene leaching solution. Background technique [0002] Lithium resources that can be developed and utilized in nature are mainly lithium ore and salt lake brine. my country mainly relies on lithium mines to produce lithium salts, because the content of magnesium and lithium in my country's salt lake brine is relatively high, and magnesium and lithium are difficult to separate. Spodumene is the most widely used lithium ore, followed by petalite and lepidolite. The physical and chemical properties and impurity components of different lithium ores are different, and the methods of extracting lithium are also different. At present, the commonly used ore lithium extraction processes include sulfuric acid method, sulfate method, limestone roasting method, soda ash pressure cooking method, chlorina...

Claims

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Application Information

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IPC IPC(8): C01D15/04
Inventor 李良彬王彬陈超傅利华郁兴国谢柳凤高贵彦胡萍李霞
Owner GANFENG LITHIUM CO LTD
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