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A process for producing lithium fluoride from spodumene concentrate

A technology of spodumene concentrate and lithium fluoride, applied in lithium halide and other directions, can solve the problems of dangerous operation and high production cost, and achieve the effect of ensuring safety, reducing production cost and reducing subsequent production processes

Inactive Publication Date: 2015-10-14
甘孜州泸兴锂业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] In order to solve the problems of dangerous operation and high production cost in the existing method for producing lithium fluoride, the present invention provides a process for producing lithium fluoride from spodumene concentrate, which has the problems of safe operation and low production cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] The impurity-free saturated 1.5M 3 The sodium fluoride solution is added to the reactor (the volume of the reactor is 6.5 M 3 , and slowly heat up (the initial temperature in the reactor is controlled at 40-55°C, and the final reaction temperature is controlled at 85°C); slowly add lithium sulfate solution according to the theoretical amount of complete reaction (lithium sulfate solution is the step (4) of the present invention) After the lithium sulfate solution, in order to ensure that the process of fully reacting needs to control the speed of input, it is guaranteed to react completely between 1.5-2 hours. The amount of lithium sulfate solution added can be calculated according to the chemical equation, Li 2 SO 4 +NaF=LiF+Na 2 SO 4 , those skilled in the art can understand and understand, and will not repeat them here.

Embodiment 2

[0063] The sodium fluoride in embodiment one is changed into ammonium fluoride, and all the other processes are the same.

Embodiment 3

[0065] The sodium fluoride in embodiment one is changed into potassium fluoride, and all the other processes are the same.

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PUM

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Abstract

The invention discloses a process for producing lithium fluoride by using spodumene concentrate, for solving the problems in the lithium fluoride production process in the prior art that the operation is dangerous and the production cost is high. According to the process, a lithium sulfate solution is adopted to have neutralization reaction with sodium fluoride, ammonium fluoride or sodium fluoride to prepare a main product of lithium fluoride. By adopting the process, use of strong hydrofluoric acid is avoided, meanwhile the problem that a great deal of carbon dioxide overflows in the reaction process using lithium carbonate is also solved, and the security of the production process is ensured; a lithium sulfate purification liquid is semi-finished product in a lithium carbonate production process or lithium process by using a mineral method, the lithium carbonate and the lithium are finished products, and thus the later production process is reduced, and the production cost is lowered.

Description

technical field [0001] The invention belongs to the field of lithium batteries, and in particular relates to a process for producing lithium fluoride from spodumene concentrate. Background technique [0002] There are two methods for producing lithium fluoride in the existing industry, neutralization method and double decomposition method. The neutralization method is often used in industrial production. The neutralization method is to prepare lithium fluoride by reacting lithium carbonate or lithium hydroxide with hydrofluoric acid. [0003] For example, the invention patent with application number 200910221557.7 discloses a preparation method of lithium fluoride, which includes the following contents: [0004] 1. Mix high-purity lithium carbonate with pure water, pass in carbon dioxide gas, and carry out carbonization reaction to obtain lithium bicarbonate solution; [0005] 2. Precisely filter the lithium bicarbonate solution; [0006] 3. Feed hydrofluoric acid into t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D15/04
Inventor 张晓洪
Owner 甘孜州泸兴锂业有限公司