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Method for extracting lithium carbonate from lithium-rich clay by acid-base combination method

A technology of acid-base combination and lithium carbonate, which is applied in the direction of lithium carbonate; The effect of low production cost and low energy consumption

Active Publication Date: 2022-01-21
潘爱芳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lithium in clay minerals is mainly stored in clay minerals, and it is not suitable to directly use the above process for lithium extraction.
[0004] At present, the process of extracting lithium from lithium-rich clay ore generally has problems such as high energy consumption, high requirements for equipment, large slag production, and high cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The main chemical composition SiO in the lithium-rich clay of this embodiment 2 The content is 42.85%, Fe 2 o 3 The content is 5.38%, Al 2 o 3 The content is 36.03%, Li 2 O content is 0.98‰. Specific steps are as follows:

[0042] S1: Crushing and grinding the lithium-rich clay to 100 mesh to obtain a lithium-rich clay powder sample;

[0043] S2: According to the mass ratio of liquid-solid ratio of 5:1, put the lithium-rich clay ore powder sample obtained in S1 in a sulfuric acid solution with a concentration of 6mol / L, stir and dissolve for 0.5h at a temperature of 40°C, and separate by filtration , to obtain pickling solution and pickling residue;

[0044]S3: Mix the acid leaching residue obtained in S2 with the sodium hydroxide solution with a mass concentration of 10% according to a mass ratio of 1:9, stir for 3 hours at a temperature of 60° C., and filter to obtain the alkali leaching solution and alkali leaching residue;

[0045] S4: Heat the alkali immers...

Embodiment 2

[0049] The main chemical composition SiO in the lithium-rich clay of this embodiment 2 The content is 42.85%, Fe 2 o 3 The content is 5.38%, Al 2 o 3 The content is 36.03%, Li 2 O content is 0.98‰. Specific steps are as follows:

[0050] S1: Crushing and grinding the lithium-rich clay to 400 mesh to obtain a lithium-rich clay powder sample;

[0051] S2: According to the mass ratio of liquid-solid ratio of 8:1, the lithium-rich clay ore powder sample obtained in S1 is placed in a sulfuric acid solution with a concentration of 2mol / L, stirred and dissolved for 0.5h at a temperature of 100°C, and separated by filtration , to obtain pickling solution and pickling residue;

[0052] S3: Mix the acid leaching residue obtained in S2 with the sodium hydroxide solution with a mass concentration of 40% according to a mass ratio of 1:3.5, stir at 100° C. for 0.5 h, and filter to obtain the alkali leaching solution and alkali leaching residue;

[0053] S4: After heating the alkali ...

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Abstract

The invention relates to a method for extracting lithium carbonate from lithium-rich clay by an acid-base combination method, the method comprises the following steps: adding the lithium-rich clay into a sulfuric acid solution with a certain concentration for leaching, and then filtering and separating to obtain an acid leaching solution and acid leaching residues; adding a sodium hydroxide solution into the acid leaching residues for alkaline leaching, then performing filtering separation, and obtaining alkaline leaching liquid and alkaline leaching residues; and introducing carbon dioxide gas into the alkaline leaching solution, and filtering when the pH value reaches 8.5-10.5 to obtain a lithium carbonate solid and a carbon component mother solution. The method has the advantages of being simple in technological process, free of special requirements for equipment, low in energy consumption, good in controllability of technological parameters, small in residual amount of residues, low in production cost and the like, and a new way is opened up for development and utilization of the lithium-rich clay.

Description

technical field [0001] The invention relates to a method for extracting lithium carbonate from lithium-rich clay by an acid-base combined method, belonging to the technical fields of metallurgy and mineral utilization. Background technique [0002] Lithium has special physical and electrochemical properties such as low density and high specific energy. It is widely used in cutting-edge industries such as new energy development, nuclear industry, aerospace and national defense, and has extremely high economic and strategic value. my country's lithium ore resources are relatively rich, accounting for about 13.8% of the world's total resources. However, due to the continuous growth of demand for lithium resources and the constraints of lithium mine development and utilization technology, the protection of lithium resources in my country is seriously insufficient, and the dependence on foreign countries is as high as 76%. At present, the lithium deposit resources mined and util...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/08
CPCC01D15/08
Inventor 潘爱芳马昱昭孙悦马润勇
Owner 潘爱芳
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