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Method for preparing high-purity lithium carbonate and other available byproducts from salt lake brine

A high-purity lithium carbonate, salt lake brine technology, applied in lithium halide, calcium carbonate/strontium/barium, lithium carbonate;/acid carbonate, etc., can solve the problem of not being comprehensively utilized

Inactive Publication Date: 2010-05-26
DALIAN LICHANG NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the rich ionic components in salt lake brine, in addition to lithium, there are also various metal ions such as potassium, sodium, boron, calcium, magnesium, etc., so many by-products are often produced during extraction, and these by-products are not obtained in the traditional lithium extraction method. Comprehensive utilization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] In this embodiment, ammonia water and ammonium bicarbonate are used as precipitating agents.

[0018] The brine of the salt lake is sun-salted by the salt field method, and potassium and sodium ions are separated.

[0019] Add excess hydrochloric acid to the solution after drying the salt, obtain boric acid by acidification method, and separate boron ions.

[0020] Put the salt lake brine into the reaction kettle, then add excess ammonia water, control the temperature at 50 degrees Celsius, react to obtain magnesium hydroxide precipitate, lithium hydroxide, calcium hydroxide, ammonia water and ammonium chloride solution, and vacuum filter the precipitate Separated from solution, isolated magnesium hydroxide.

[0021] Put the above solution into the reaction kettle, add excess ammonium bicarbonate, control the temperature at 50 degrees Celsius, react to obtain calcium carbonate precipitate, lithium bicarbonate, ammonium chloride and ammonium bicarbonate solution, and va...

Embodiment 2

[0025] In this example, calcium hydroxide and carbon dioxide were used as precipitating agents.

[0026] The brine of the salt lake is sun-salted by the salt field method, and potassium and sodium ions are separated.

[0027] Add excess hydrochloric acid to the solution after drying the salt, obtain boric acid by acidification method, and separate boron ions.

[0028] Put salt lake brine into the reaction kettle, then add excess calcium hydroxide, control the temperature at 60 degrees Celsius, react to obtain magnesium hydroxide precipitate, calcium chloride, lithium hydroxide and calcium hydroxide solution, and vacuum filter the precipitate Separated from solution, isolated magnesium hydroxide.

[0029] Put the above solution into a reaction kettle, pass in excess carbon dioxide, control the temperature to 50 degrees Celsius, react to obtain calcium carbonate precipitate and lithium bicarbonate solution, and use vacuum filtration to separate the precipitate from the solution...

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PUM

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Abstract

The invention relates to a method for preparing high-purity lithium carbonate and other available byproducts from salt lake brine. The method comprises the following steps: (1) separating potassium and sodium by exposing salt in a salt field, (2) separating boron by an acidification method, (3) separating magnesium by a sedimentation method, (4) separating calcium by the sedimentation method, (5) preparing lithium chloride, and (6) preparing the lithium carbonate. The preparation method of the invention can purify the potassium, sodium, boron, magnesium and calcium ions respectively besides obtaining the lithium carbonate product of which the purity is over 99.5 percent so as to fully utilize the salt lake brine resource.

Description

technical field [0001] The invention provides a method for comprehensively utilizing salt lake brine, especially a method for producing high-purity lithium carbonate and utilizing by-products. Background technique [0002] Lithium resources are mainly stored in seawater, salt lake brine, geothermal water and ores, among which the lithium reserves in ores are less than 3% of the total reserves, while the lithium content in salt lake brines is relatively high, accounting for 70-80% of the world's lithium reserves . [0003] The methods for extracting lithium from brine mainly include precipitation method, extraction method, ion exchange adsorption method, carbonization method, calcination leaching method, Xu's method, electrodialysis method, etc. [0004] Due to the rich ionic components in salt lake brine, in addition to lithium, there are also various metal ions such as potassium, sodium, boron, calcium, magnesium, etc., so many by-products are often produced during extract...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08C01B35/10C01D3/06C01F5/20C01F11/18C01D15/04
Inventor 耿世达
Owner DALIAN LICHANG NEW MATERIAL CO LTD
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