Method for preparing lithium carbonate with high-lithium salt lake bittern

A salt lake brine and lithium carbonate technology, applied in the direction of lithium carbonate;/acid carbonate, etc., can solve the problems of low recovery rate, high cost, complicated process, etc., and achieve the effect of reducing content and improving purity

Inactive Publication Date: 2015-11-11
韦海棉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is that, aiming at defects such as complex process, high cost and low recovery rate in the preparation process of lithium carbonate in the prior art, the invention provides a method for preparing lithium carbonate from brine in a high-lithium salt lake. A method for extracting lithium chloride after adding inorganic salts to remove impurities in brine, and then adding additives, complexing agents and precipitating agents to the lithium chloride solution to prepare lithium carbonate

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0025] A method for preparing lithium carbonate from high-lithium salt lake brine, specifically comprising the following steps:

[0026] S1. Add high-lithium salt lake brine into the reaction vessel, then add an excess of 15% carbonate solution to remove calcium and magnesium ions, heat to 80-90°C, keep warm for 0.2 hours, and remove calcium carbonate and magnesium carbonate by suction filtration;

[0027] S2. Adding an excess of 5% barium salt to the product of S1 to remove sulfate radicals, heating to 60-70° C., keeping the temperature for 0.5 hours, and removing barium sulfate by suction filtration;

[0028] S3, add inorganic acid to the product of S2 to remove boron, adjust the pH value to 0.5-1, keep the reaction temperature at 25-30°C, and remove boric acid by suction filtration;

[0029] S4, adding a strong base to the product of S3, adjusting the pH value of the solution to 7-8 to obtain a lithium chloride solution;

[0030] S5, adding complexing agent and additives t...

Embodiment 2

[0042] A method for preparing lithium carbonate from high-lithium salt lake brine, specifically comprising the following steps:

[0043] S1. Add high-lithium salt lake brine into the reaction vessel, then add an excess of 15% carbonate solution to remove calcium and magnesium ions, heat to 80-90°C, keep warm for 0.5 hours, and remove calcium carbonate and magnesium carbonate by suction filtration;

[0044] S2. Adding an excess of 5% barium salt to the product of S1 to remove sulfate radicals, heating to 60-70° C., keeping the temperature for 0.5 hours, and removing barium sulfate by suction filtration;

[0045] S3, add inorganic acid to the product of S2 to remove boron, adjust the pH value to 0.5-1, keep the reaction temperature at 25-30°C, and remove boric acid by suction filtration;

[0046] S4, adding a strong base to the product of S3, adjusting the pH value of the solution to 7-8 to obtain a lithium chloride solution;

[0047] S5, adding complexing agent and additives t...

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PUM

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Abstract

The invention relates to the field of inorganic salt chemical engineering and discloses a method for preparing lithium carbonate with high-lithium salt lake bittern. The method comprises the steps of adding inorganic salt into the salt lake bittern for removing impurities, extracting lithium chloride, and then adding addition agents, complexing agents and precipitating agents into a lithium chloride solution for preparing the lithium carbonate. By means of the added complexing agents, micro calcium and magnesium ions remaining in the bittern can be effectively removed, and the content of the calcium and magnesium ions in a lithium carbonate product is reduced; by means of the addition agents, the lithium carbonate purity is effectively raised.

Description

technical field [0001] The invention relates to the field of inorganic salt chemical industry, in particular to a method for preparing lithium carbonate from high-lithium salt lake brine. Background technique [0002] Lithium is known as the "energy upstart" in the 21st century. It is the lightest and most active metal element in nature, and it is a new energy raw material. There are many types of lithium products, such as lithium carbonate, lithium chloride, lithium bromide, lithium hydroxide, etc. Lithium carbonate, as the most important kind of lithium products, is widely used in traditional industries such as chemical industry, metallurgy, ceramics, medicine, refrigeration, etc. It can also be used to prepare catalysts for chemical reactions, known as "Dingye MSG". In recent years, with the continuous advancement of science and technology, lithium carbonate has been gradually used in energy, military industry, aerospace and other fields, and is regarded as an important ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08
Inventor 韦海棉
Owner 韦海棉
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