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Method for producing lithium chloride solution from lithium fluoride

A lithium fluoride and lithium chloride technology, applied in lithium halide, calcium/strontium/barium fluoride, calcium/strontium/barium halide, etc., can solve the problems of high material requirements, harsh operating environment and high consumption of hydrochloric acid , to achieve the effect of reducing the amount of hydrochloric acid, reducing environmental pollution and improving the operating environment

Inactive Publication Date: 2018-12-04
自贡同发荣新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first method consumes a lot of hydrochloric acid, the reaction process releases a lot of heat, and has high requirements on the material of the reaction tank. At the same time, a large amount of flue gas containing hydrofluoric acid is generated, which makes the operating environment extremely harsh; the second method is under neutral conditions. (PH value around 7), react without adding acid, but use a pressure reaction tank and ball mill lithium fluoride, and the corrosion of the equipment by chlorine radicals at high temperatures is also serious

Method used

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  • Method for producing lithium chloride solution from lithium fluoride
  • Method for producing lithium chloride solution from lithium fluoride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Add 2.5 square meters of production water to the reaction tank, start stirring, add lithium fluoride (100Kg of metal lithium), then add anhydrous calcium chloride (90% content) 1000Kg, add hydrochloric acid after adding calcium chloride to adjust the pH value to 1.5, heat to 85 degrees by steam, and keep it warm for 4 hours until the reaction is complete, then neutralize the pH to 6-8 with calcium hydroxide solution, filter to obtain lithium chloride solution. During the heat preservation process, the pH value remained unchanged, and the calcium ion content was 2.8 / l.

[0038] In order to better control the calcium ion content, the calcium ion content in the solution was detected after the incubation reaction for 30 minutes.

Embodiment 2

[0040] Add 3 square meters of production water to the reaction tank, start stirring, add lithium fluoride (100Kg of metal lithium), then add anhydrous calcium chloride (90% content) 1150Kg, add hydrochloric acid after adding calcium chloride to adjust the pH value to 2.0, heat to 85 degrees with steam, and keep warm for 4 hours until the reaction is complete, then neutralize the pH to 6-8 with calcium hydroxide solution, filter to obtain lithium chloride solution. During the heat preservation process, the pH value remained unchanged, and the calcium ion content was 19 / l.

[0041] In order to better control the calcium ion content, the calcium ion content in the solution was detected after the incubation reaction for 30 minutes.

Embodiment 3

[0043] Add 3 square meters of production water to the reaction tank, start stirring, add lithium fluoride (100Kg of metal lithium), then add anhydrous calcium chloride (90% content) 1250Kg, add hydrochloric acid after adding calcium chloride to adjust the pH value to 1.0, heated to 80 degrees with steam, and kept warm for 4 hours until the reaction was complete, then neutralized the pH to 6-8 with calcium hydroxide solution, filtered to obtain lithium chloride solution. During the heat preservation process, the pH value remained unchanged, and the calcium ion content was 33 / l.

[0044] In order to better control the calcium ion content, the calcium ion content in the solution was detected after the incubation reaction for 30 minutes.

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Abstract

The invention provides a method for producing a lithium chloride solution from lithium fluoride, and is characterized in that the method comprises the steps: adding water into a reaction tank, addinglithium fluoride while stirring, then adding calcium chloride, after addition of calcium chloride is completed, adding hydrochloric acid to adjust pH value, introducing steam, heating, carrying out heat preservation for a period of time until the reaction is completed, then neutralizing the pH to 6-8 with an alkaline solution, and filtering to obtain the lithium chloride solution. A large amount of hydrochloric acid does not need to be added in the reaction, and the reaction does not need to be carried out under high pressure conditions, so environmental pollution and unsafe production problems are avoided.

Description

technical field [0001] The invention relates to a production method of lithium chloride solution, in particular to a method for producing lithium chloride solution with waste lithium fluoride. Background technique [0002] Now waste lithium fluoride to produce lithium chloride solution, there are basically two methods, one is to dissolve all of them with hydrochloric acid and neutralize with calcium oxide or calcium hydroxide to produce calcium fluoride and lithium chloride solution; the other is to use chlorine Calcium chloride pressure cooking method to generate calcium fluoride and lithium chloride solution. The first method consumes a lot of hydrochloric acid, the reaction process releases a lot of heat, and has high requirements on the material of the reaction tank. At the same time, a large amount of flue gas containing hydrofluoric acid is generated, which makes the operating environment extremely harsh; the second method is under neutral conditions. (PH value around...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/04C01F11/22
CPCC01D15/04C01F11/22
Inventor 袁茂强赵本福郝俊
Owner 自贡同发荣新材料有限公司
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