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Preparation method of lithium carbonate

A technology of lithium carbonate and carbonation, applied in the direction of lithium carbonate;/acid carbonate, etc., can solve problems such as electrical or optical performance degradation, and achieve excellent effects and effects

Active Publication Date: 2013-12-18
NITTETABU MINING CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, when lithium carbonate is used as the above-mentioned electronic material or optical industrial material, a large amount of impurities can degrade its electrical or optical properties

Method used

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Examples

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Effect test

preparation example Construction

[0037] Below the method for preparing lithium carbonate of the present invention, and the method for preparing high-purity lithium carbonate are described in more detail.

[0038] As mentioned above, the method for preparing lithium carbonate of the present invention comprises: mixing ammonia and carbon dioxide gas (carbonic acid gas) with an aqueous solution containing lithium chloride to carry out a carbonation reaction, then reclaiming the resulting solid by solid-liquid separation, and The method for preparing high-purity lithium carbonate comprises washing the lithium carbonate recovered above with a highly concentrated lithium carbonate aqueous solution.

[0039] In the present invention, the aqueous solution containing lithium chloride is used as a raw material for producing lithium carbonate, and its lithium concentration is preferably from 2.0% by weight to a saturated concentration, more preferably from 4.5% by weight to a saturated concentration, and even more prefer...

Embodiment

[0071] The present invention will be described below with reference to the embodiment, but needless to say, the present invention should not be construed as being limited to the embodiment in any way, but the invention should be defined by the description of the claims.

[0072] Incidentally, in Examples, a simulated brine in which potassium chloride and sodium chloride were contained in lithium chloride was prepared, and lithium carbonate and high-purity lithium carbonate were produced using the simulated brine.

[0073] A simulated brine was prepared using lithium chloride, potassium chloride, and sodium chloride, all primary pure chemicals, to contain 0.1 wt % lithium (Li), 1.5 wt % potassium (K) and 8.1 wt % Sodium (Na).

[0074] The simulated brine was concentrated by evaporation, and filtered after concentration to separate the precipitated solid to obtain a concentrated brine containing 6.0% by weight of Li.

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PUM

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Abstract

The invention relates to a preparation method of lithium carbonate. The method comprises the following steps: mixing ammonia and carbon dioxide gas (carbonic acid gas) with a water solution containing lithium chloride to carry out carbonation reactions, and then recovering the generated solid through a solid / liquid separation method. The invention also relates to a preparation method of high purity lithium carbonate. The preparation method of lithium carbonate is capable of reducing transportation cost, and improving the purity of lithium carbonate through a simple washing operation.

Description

technical field [0001] The present invention relates to a method for preparing lithium carbonate, wherein said lithium carbonate is particularly useful as a raw material for electronic materials and optical industry materials. The present invention also relates to a method for preparing high-purity lithium carbonate. [0002] More specifically, the present invention relates to a process for the preparation of lithium carbonate, which is particularly suitable for the preparation of lithium carbonate of high purity from lithium chloride-containing brines to such a degree that it can be used as a lithium battery material. The present invention also relates to a method for preparing high-purity lithium carbonate, including purifying lithium carbonate and reclaiming it. Background technique [0003] Lithium carbonate has been used in various applications such as a compounding agent for heat-resistant glass, optical glass, etc., ceramic materials, a raw material for lithium secon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08
Inventor 谷村裕次三觜幸平瓦吹亮河田真伸山口裕
Owner NITTETABU MINING CORP
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