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Method for preparing battery-grade lithium carbonate by taking lepidolite as raw material

A battery-grade, lepidolite technology, applied in the direction of lithium carbonate;/acid carbonate, etc., can solve problems such as complex impurity removal process

Inactive Publication Date: 2021-04-13
江西南氏锂电新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method introduces compound salt, which needs to go through a more complicated impurity removal process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] S1. Add 100g of concentrated sulfuric acid and 100g of lepidolite powder into a ball mill for mechanical grinding for 24 hours. During the mixing process, a solid phase reaction occurs. Transfer the mechanically ground lepidolite powder-concentrated sulfuric acid mixture to an extraction tank, and add 2000g water, soaked for 24 hours, leaching and dissolving alkali metal sulfate, filtering and separating to obtain leachate, which mainly contains potassium salt, aluminum salt, lithium salt, rubidium salt and cesium salt;

[0026] S2. Control the temperature of the leaching solution at 65°C, add rubidium aluminum sulfate crystals as seed crystals, and use it as a crystallization inducer to precipitate aluminum rubidium sulfate alum salt and cesium aluminum sulfate alum salt, and filter to obtain filtrate A; cool filtrate A to 15°C , add potassium aluminum sulfate crystallization inducer, separate out potassium aluminum sulfate alum salt, filter to obtain filtrate B;

[00...

Embodiment 2

[0030] S1. Add 100g of concentrated sulfuric acid and 200g of lepidolite powder into a ball mill for mechanical grinding for 36 hours. During the mixing process, a solid phase reaction occurs. Transfer the mechanically ground lepidolite powder-concentrated sulfuric acid mixture to the extraction tank, and add 2000g water, soaked for 36 hours, leaching and dissolving alkali metal sulfate, filtering and separating to obtain leachate, which mainly contains potassium salt, aluminum salt, lithium salt, rubidium salt and cesium salt;

[0031] S2. Control the temperature of the leaching solution at 60°C, add aluminum rubidium sulfate and aluminum cesium sulfate crystallization inducers, precipitate aluminum rubidium sulfate alum salt and aluminum cesium sulfate alum salt, filter to obtain filtrate A; cool filtrate A to 10°C, add sulfuric acid Aluminum potassium crystallization inducer, precipitates aluminum potassium alum salt, filters to obtain filtrate B;

[0032] S3. Add potassium...

Embodiment 3

[0035] S1. Add 100g of concentrated sulfuric acid and 400g of lepidolite powder into a ball mill for mechanical grinding for 36 hours. During the mixing process, a solid phase reaction occurs. Transfer the mechanically ground lepidolite powder-concentrated sulfuric acid mixture to the extraction tank, and add 2000g water, soaked for 24 hours, leaching and dissolving alkali metal sulfate, filtering and separating to obtain leachate, which mainly contains potassium salt, aluminum salt, lithium salt, rubidium salt and cesium salt;

[0036] S2. Control the temperature of the leaching solution at 55°C, add rubidium aluminum sulfate and cesium aluminum sulfate crystallization inducers, precipitate rubidium aluminum sulfate alum salt and cesium aluminum sulfate alum salt, filter to obtain filtrate A; cool filtrate A to 15°C, add sulfuric acid Aluminum potassium crystallization inducer, precipitates aluminum potassium alum salt, filters to obtain filtrate B;

[0037] S3. Add potassium...

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PUM

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Abstract

The invention discloses a method for preparing battery-grade lithium carbonate by using lepidolite as a raw material. The method comprises the following steps: carrying out solid-phase reaction on concentrated sulfuric acid and lepidolite at medium and low temperatures, and leaching with water to dissolve sulfuric acid alkali metal salt; respectively separating out aluminum rubidium cesium sulfate alum salt, aluminum potassium sulfate alum salt and the like in different temperature intervals by adopting a method of adding different crystallization inducers to continuously induce crystallization and remove impurities; adopting potassium hydroxide for neutralization, crystallization and impurity removal to obtain aluminum hydroxide and potassium sulfate, applying the aluminum hydroxide for neutralizing excessive sulfuric acid, and supplementing the potassium sulfate to obtain the aluminum potassium sulfate alum salt; and finally, reacting the obtained lithium hydroxide solution with carbon dioxide to prepare battery-grade lithium carbonate. According to the method, potassium hydroxide and aluminum hydroxide are used as neutralizing reagents and potassium sulfate is used as a crystallization impurity removal reagent, so that impurity ions such as calcium and magnesium are not introduced into the production process; and finally, the obtained lithium hydroxide solution reacts with carbon dioxide to prepare the battery-grade lithium carbonate, and a major breakthrough in the technology of preparing the battery-grade lithium carbonate from lepidolite through a one-step method is achieved.

Description

technical field [0001] The invention relates to the technical field of nonferrous metal smelting, in particular to a method for preparing battery-grade lithium carbonate from lepidolite. Background technique [0002] Lepidolite is an important mineral resource, and its chemical composition is K{Li 2-x al 1+x [Al 2x Si 4-2x o 10 ](OH,F) 2}(x=0-0.5), it is a basic aluminosilicate of potassium and lithium, which is a kind of mica minerals, and it is rich in rare metal materials, such as lithium, potassium, rubidium, cesium, aluminum, etc. As the world's energy becomes increasingly tense, the development and utilization of new energy is a common issue in the world, and more and more countries are paying attention to it; Lithium and its salts, lithium carbonate, lithium sulfate and other salts are the basic raw materials for the lithium battery new energy industry, and Lepidolite contains lithium metal, the basic material of lithium battery new energy industry, so the devel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08
CPCC01D15/08
Inventor 南进喜曾小毛穆健书吴进方南天苏婕张国强王玲珑叶盛旗
Owner 江西南氏锂电新材料有限公司
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