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Process for preparing lithium fluoride from lepidolite

A technology of lepidolite and lithium fluoride, applied in the direction of lithium halide, nitrogen fertilizer, fertilizer mixture, etc., can solve the problems of complex process and high cost, and achieve the effect of simple operation, low cost and short process

Pending Publication Date: 2022-01-14
山东泰普锂业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the rapid development of high-tech fields such as aluminum-lithium alloys, lithium batteries, and nuclear fusion, the demand for lithium fluoride in modern industry is becoming more and more serious, and the main route for preparing lithium fluoride is to first prepare lithium carbonate from lithium-containing minerals and then Produced by reacting with hydrofluoric acid, the process is complicated and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) Acidification of lepidolite, put lepidolite and 50% sulfuric acid into the reactor according to the mass ratio of 1:1.5, the reaction temperature is 200-400°C, and the reaction time is 0.5 hours; the gas generated by the reaction is absorbed by water in time;

[0024] 2) The clinker is soaked in water, the clinker that has been acidified by lepidolite is soaked in water according to the liquid-solid ratio of 1-4:1 and stirred for 0.5-3 hours, and the liquid-solid is separated to obtain a sulfate solution;

[0025] 3) sinking aluminum, adding one or more of sodium, potassium, ammonium and other sulfates to the above-mentioned sulfate solution to remove aluminum, and separating the liquid and solid to obtain a low-aluminum sulfate solution;

[0026] 4) purification, adding one or more of alkaline substances such as hydroxides, oxides, and carbonates to the above-mentioned low-aluminum sulfate solution to adjust pH=8-12 to remove impurities such as calcium, magnesium, an...

Embodiment 2

[0029] 1) Acidification of lepidolite, put lepidolite and 70% sulfuric acid into the reactor according to the mass ratio of 1:1.1, the reaction temperature is 200-400°C, and the reaction time is 4 hours; the gas generated by the reaction is absorbed by water in time;

[0030] 2) The clinker is soaked in water, the clinker that has been acidified by lepidolite is soaked in water according to the liquid-solid ratio of 1-4:1 and stirred for 0.5-3 hours, and the liquid-solid is separated to obtain a sulfate solution;

[0031] 3) sinking aluminum, adding one or more of sodium, potassium, ammonium and other sulfates to the above-mentioned sulfate solution to remove aluminum, and separating the liquid and solid to obtain a low-aluminum sulfate solution;

[0032] 4) purification, adding one or more of alkaline substances such as hydroxides, oxides, and carbonates to the above-mentioned low-aluminum sulfate solution to adjust pH=8-12 to remove impurities such as calcium, magnesium, and ...

Embodiment 3

[0035] 1) Acidification of lepidolite, put lepidolite and 98% sulfuric acid into the reactor according to the mass ratio of 1:0.77, the reaction temperature is 200-400°C, and the reaction time is 6 hours; the gas generated by the reaction is absorbed by water in time;

[0036] 2) The clinker is soaked in water, the clinker that has been acidified by lepidolite is soaked in water according to the liquid-solid ratio of 1-4:1 and stirred for 0.5-3 hours, and the liquid-solid is separated to obtain a sulfate solution;

[0037] 3) sinking aluminum, adding one or more of sodium, potassium, ammonium and other sulfates to the above-mentioned sulfate solution to remove aluminum, and separating the liquid and solid to obtain a low-aluminum sulfate solution;

[0038] 4) purification, adding one or more of alkaline substances such as hydroxides, oxides, and carbonates to the above-mentioned low-aluminum sulfate solution to adjust pH=8-12 to remove impurities such as calcium, magnesium, and...

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Abstract

The invention relates to a process for preparing lithium fluoride from lepidolite. The process comprises the following steps: 1, acidifying lepidolite; 2, soaking clinker in water; 3, aluminum deposition; 4, purifying; and 5, concentrating and precipitating lithium. The process has the advantages that 1, lithium and fluorine in the low-grade lepidolite are comprehensively utilized to generate the lithium fluoride, a fluorine-containing raw material does not need to be introduced additionally, and compared with a process for producing the lithium fluoride from hydrofluoric acid and lithium carbonate, the cost is low, the flow is short, and the operation is simple; 2, lithium fluoride mother liquor generated by the process is returned to an aluminum precipitation section and can form double salt with aluminum sulfate to effectively remove impurity salts, so that alkaline substances used in an impurity removal section can be effectively saved; and 3, the reserves of the lepidolite in China are very rich, how to comprehensively utilize various elements in the lepidolite to turn waste into wealth is the primary responsibility of each scientific worker, and the lithium fluoride prepared by the process meets the ever-increasing raw material demand of lithium battery electrolyte lithium hexafluorophosphate, and is of great significance to development of lithium battery new energy in China.

Description

technical field [0001] The invention belongs to the field of extracting lithium from lithium ore, in particular to a process for preparing lithium fluoride from lepidolite. Background technique [0002] Lithium fluoride is an alkali metal halide, which is widely used in nuclear industry, enamel industry, optical glass manufacturing, desiccant flux, etc. It is also a raw material for the preparation of lithium hexafluorophosphate. With the rapid development of high-tech fields such as aluminum-lithium alloys, lithium batteries, and nuclear fusion, the demand for lithium fluoride in modern industry is becoming more and more serious, and the main route for preparing lithium fluoride is to first prepare lithium carbonate from lithium-containing minerals and then It is obtained by reacting with hydrofluoric acid, the process is complicated and the cost is high. Contents of the invention [0003] The invention provides a process for preparing lithium fluoride from lepidolite to...

Claims

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Application Information

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IPC IPC(8): C01D15/04C05G1/10
CPCC01D15/04C05C3/00C05D1/02
Inventor 王占前颜廷利代文彬康如金亓亮吕延鹏肖莉莉武亮亮
Owner 山东泰普锂业科技有限公司
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