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Method of extracting lithium carbonate from lepidolite ore

A technology of lepidolite and lithium carbonate, applied in the direction of lithium carbonate;/acid carbonate, etc., can solve the problems of low purity of lithium carbonate, significant impurity removal effect, low energy consumption, etc., and achieve low energy consumption , good cleaning effect and simple treatment method

Active Publication Date: 2017-08-29
江西南氏锂电新材料有限公司
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  • Abstract
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Problems solved by technology

[0007] In order to overcome the technical deficiency that the purity of lithium carbonate prepared from lepidolite in the prior art is not high, the invention provides a method for extracting lithium carbonate from lepidolite ore. Steps such as calcium oxide removal, sodium carbonate removal and other steps make almost all the metal ions in lepidolite leaching solution, and finally add saturated sodium carbonate and heat reaction to obtain high-purity lithium carbonate product. This method has low energy consumption and requires less equipment. Low, remarkable impurity removal effect, suitable for popularization and application of lithium carbonate preparation process using lepidolite as raw material

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  • Method of extracting lithium carbonate from lepidolite ore

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Embodiment 1

[0029] Embodiment 1 The present invention extracts the method for lithium carbonate from lepidolite ore

[0030] A method for extracting lithium carbonate from lepidolite ore, it specifically comprises the steps:

[0031] 1) Use a ball mill to grind lepidolite to 400 mesh fine particles, mix it with 85% concentrated sulfuric acid, heat it to 180°C to allow it to fully react for 20 minutes, filter after the reaction is completed, and obtain solution A; wherein the lepidolite fine particles are mixed with 85 The mass mixing ratio of % concentrated sulfuric acid is 1:3.5.

[0032] 2) Cool the solution A by 2.3°C per minute to 18°C ​​according to the cooling rate under stirring, filter, cool the solution by 0.7°C per minute to 3°C, precipitate and filter to obtain solution B, and return solution B to room temperature;

[0033] 3) Slowly add calcium hydroxide solution to solution B, adjust the pH of the solution to 8, filter the solution, continue to add calcium hydroxide solution...

Embodiment 2

[0035] Embodiment 2 The present invention extracts the method for lithium carbonate from lepidolite ore

[0036] A method for extracting lithium carbonate from lepidolite ore, it specifically comprises the steps:

[0037] 1) Use a ball mill to grind lepidolite to 200 mesh fine particles, mix it with 85% concentrated sulfuric acid, heat it to 150°C to allow it to fully react for 15 minutes, filter after the reaction is completed, and obtain solution A; wherein the lepidolite fine particles are mixed with 85 The mass mixing ratio of % concentrated sulfuric acid is 1:2.5.

[0038] 2) Cool solution A by 2.0°C per minute to 20°C according to the cooling rate under stirring, filter, cool the solution by 0.5°C per minute to 7°C, precipitate and filter to obtain solution B, and return solution B to room temperature;

[0039] 3) Slowly add calcium hydroxide solution to solution B, adjust the pH of the solution to 7, filter the solution, continue to add calcium hydroxide solution to th...

Embodiment 3

[0041] Embodiment 3 The present invention extracts the method for lithium carbonate from lepidolite ore

[0042] A method for extracting lithium carbonate from lepidolite ore, it specifically comprises the steps:

[0043] 1) Use a ball mill to grind lepidolite to 300 mesh fine particles, mix it with 85% concentrated sulfuric acid, heat to 150°C-180°C to fully react for 18min, and filter after the reaction to obtain solution A; wherein the lepidolite is fine The mass mixing ratio of particles to 85% concentrated sulfuric acid is 1:3.

[0044] 2) Cool solution A by 2.1°C per minute to 19°C according to the cooling rate under stirring, filter, cool the solution by 0.6°C per minute to 5°C, precipitate and filter to obtain solution B, and return solution B to room temperature;

[0045] 3) Slowly add calcium hydroxide solution to solution B, adjust the pH of the solution to 7, filter the solution, continue to add calcium hydroxide solution to the solution to adjust the pH of the so...

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Abstract

The invention relates to a method of extracting lithium carbonate from lepidolite ore, and belongs to the field of preparation of lithium batteries. For overcoming the technical defect of low purity of lithium carbonate extracted from lepidolite in the prior art, the invention provides the method of extracting lithium carbonate from lepidolite ore, which includes the steps of sulfuric acid reaction, low-temperature vanadium deposition, impurity removal with Ca(OH)2 and Na2CO3, etc., so that metal ions in a leaching liquid of lepidolite are removed almost, and finally, saturated Na2CO3 is added to carry out a heating reaction to produce a high-purity lithium carbonate product. The method is low in energy consumption and demand on equipment, has significant impurity removal effects, and is suitable for promotion and application of preparation technologies of lithium carbonate with the lepidolite as raw material.

Description

technical field [0001] The invention relates to a method for extracting lithium carbonate from lepidolite, belonging to the field of lithium battery preparation. Background technique [0002] Lepidolite, also known as "scale mica", is mainly composed of KLi 1.5 Al 1.5 [AlSi 3 o 10 ](F,OH) 2 , containing Li 2 O is about 1.23-5.90%, and it also contains other rare metals such as rubidium and cesium; among them, Yichun City has the largest lepidolite mine in the world, and the mineable amount of lithium oxide accounts for 31% of the country and 8.2% of the world. Lepidolite is the most common lithium mineral and an important mineral for extracting lithium. Its comprehensive development and utilization has very important economic and strategic value. [0003] Lithium carbonate is an important chemical raw material. With the national new energy development plan, lithium battery new energy has become one of the national key support for the development of energy industries; a...

Claims

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Application Information

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IPC IPC(8): C01D15/08
CPCC01D15/08C01P2006/80
Inventor 南进喜李汉文吴进方刘万云汤洪波
Owner 江西南氏锂电新材料有限公司
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