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A kind of method for removing fluorine from lepidolite roasting leaching solution

A leachate and lepidolite technology, applied in the direction of improving process efficiency, lithium carbonate;/acid carbonate, etc., can solve problems such as non-compliance with use requirements, affecting product quality, etc., to improve quality and reduce operating costs , The effect of high removal rate

Active Publication Date: 2022-07-01
JIANGXI YONGXING SPECIAL STEEL NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Lepidolite leachate is commonly used to prepare battery-grade lithium carbonate, but the presence of a small amount of fluorine in the leachate, directly used to produce battery-grade lithium carbonate without removing fluorine, will affect the quality of the product and does not meet the requirements for use.

Method used

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  • A kind of method for removing fluorine from lepidolite roasting leaching solution

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A method for removing fluorine from lepidolite roasting leaching solution, specifically:

[0018] The leaching solution obtained by leaching the lepidolite after roasting, according to the leaching solution 1m 3 Add 2-6 kg of defluorinating agent, stir evenly, keep at 40-60 °C, adjust pH to 6.5 after sufficient reaction, and filter after sedimentation ≥ 1 h to obtain a filtrate with reduced fluorine content for use in battery grades In the preparation of lithium carbonate, the filter residue can be used as an auxiliary material for roasting.

[0019] Wherein, the fluorine removing agent is a mixture of aluminum sulfate, aluminum oxide and silicon dioxide.

[0020] Wherein, the mass ratio of aluminum sulfate, aluminum oxide, and silicon dioxide in the mixture is 7.8:1.8:0.4.

Embodiment 2

[0022] A method for removing fluorine from lepidolite roasting leaching solution, specifically:

[0023] The leaching solution obtained by leaching the lepidolite after roasting, according to the leaching solution 1m 3 Add 2-6 kg of fluorine-removing agent to the fluorine-removing agent, stir evenly, keep the temperature at 30 °C, adjust the pH to 5.5 after sufficient reaction, settle for 2 hours, and filter to obtain a filtrate with a reduced fluorine content for use in battery-grade lithium carbonate. Preparation, the filter residue can be used as an auxiliary material for roasting.

[0024] Wherein, the fluorine removing agent is a mixture of aluminum sulfate, aluminum oxide and silicon dioxide.

[0025] Wherein, the mass ratio of aluminum sulfate, aluminum oxide, and silicon dioxide in the mixture is 7.8:1.8:0.4.

Embodiment 3

[0027] A method for removing fluorine from lepidolite roasting leaching solution, specifically:

[0028] The leaching solution obtained by leaching the lepidolite after roasting, according to the leaching solution 1m 3 Add 4-5 kg ​​of fluorine-removing agent to the fluorine-removing agent, stir evenly, keep the temperature at 50 °C, adjust the pH to 7.0 after fully reacting, and filter for 4 hours after settling to obtain a filtrate with a reduced fluorine content for use in battery-grade lithium carbonate. Preparation, the filter residue can be used as an auxiliary material for roasting.

[0029] Wherein, the fluorine removing agent is a mixture of aluminum sulfate, aluminum oxide and silicon dioxide.

[0030] Wherein, the mass ratio of aluminum sulfate, alumina, and silicon dioxide in the mixture is 7:2:0.5.

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Abstract

The invention provides a method for removing fluorine from lepidolite roasting leaching solution, belonging to the field of lithium carbonate production. After the lepidolite is roasted, the obtained leaching solution is leached, a fluorine-removing agent is added, and the mixture is evenly stirred. After fully reacting, the pH is adjusted to 5.5-7.5, and after settling for 2-4 hours, the filtrate is filtered to obtain a filtrate with a reduced fluorine content. Among them, the fluorine removal agent is a mixture of aluminum sulfate, alumina and silica. The method provided by the invention can effectively reduce the fluorine content in the lepidolite roasting leaching solution, and improve the quality of the battery-grade lithium carbonate prepared by the leaching solution.

Description

technical field [0001] The invention relates to the field of lithium carbonate production, in particular to a method for removing fluorine from a lepidolite roasting leaching solution. Background technique [0002] Lepidolite is the most common lithium mineral and an important mineral for lithium extraction. It is a basic aluminosilicate of potassium and lithium, one of the mica minerals. Lepidolite is generally only produced in granite pegmatites, the color is purple and pink and can be light to colorless, with pearl luster, in the form of short cylinders, small flake aggregates or large plate crystals. [0003] Lithium mica leaching solution is now commonly used to prepare battery-grade lithium carbonate, but the presence of a small amount of fluorine in the leachate, direct use to produce battery-grade lithium carbonate without defluorination, will affect the quality of the product and does not meet the requirements for use. SUMMARY OF THE INVENTION [0004] In view o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/44C22B26/12C01D15/08
CPCC22B3/44C22B26/12C01D15/08Y02P10/20
Inventor 杨鸿超刘华峰刘珊珊曾开兵
Owner JIANGXI YONGXING SPECIAL STEEL NEW ENERGY TECH CO LTD
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