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Method for processing battery-level lithium carbonate mother liquor

A treatment method and technology of lithium carbonate, applied in water/sewage multi-stage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problems of large steam consumption and increased lithium loss, and achieve improved recovery. efficiency, increase productivity

Active Publication Date: 2011-11-23
GANFENG LITHIUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This treatment method also consumes a lot of steam, and the part returning to the mine leaching lithium system will increase the loss of lithium due to the circulation route.

Method used

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  • Method for processing battery-level lithium carbonate mother liquor
  • Method for processing battery-level lithium carbonate mother liquor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] In 1000L mother liquor, use 35% hydrochloric acid to adjust the mother liquor to pH = 1, stir for 20 minutes, then use 1.25mol / L liquid caustic soda NaOH to make it neutral, stir for 20 minutes, and the acidification is completed. Pour the acidified mother liquor into the evaporator, continue to evaporate and feed continuously, when the solid-to-liquid ratio is about 25%, discharge the material, shake off the water, separate the sodium chloride and lithium chloride solutions, and remove the saturated sodium chloride solution Rinse once. Put lithium chloride solution into the reaction kettle, and then add 0.9mol / L soda ash solution according to the calculated amount (the calculation formula is: lithium chloride volume × lithium chloride concentration ÷ 85 × 106 ÷ 230 × 1.05 (unit: L) ), keep the temperature at 90-95°C during the feeding process, after the feeding is completed, keep the temperature constant for 30 minutes and then shake off the water. The obtained lithiu...

Embodiment 2

[0048] In 1000L mother liquor, use 35% hydrochloric acid to adjust the mother liquor to pH = 2, stir for 20 minutes, then use 1.25mol / L liquid caustic soda NaOH to make it neutral, stir for 20 minutes, and the acidification is completed. Pour the acidified mother liquor into the evaporator, continue to evaporate and feed continuously, when the solid-to-liquid ratio is about 28%, discharge the material, shake off the water, separate the sodium chloride and lithium chloride solutions, and remove the saturated sodium chloride solution Rinse once. Pour lithium chloride solution into the reaction kettle, and then add 0.9mol / L soda ash solution according to the calculated amount. During the feeding process, keep the temperature at 90-95°C. After the addition, keep the temperature constant for 30 minutes and then shake off the water. After lithium precipitation, the mother liquor and washing liquid enter the stage of acidification, evaporation and lithium precipitation, and the cycle...

Embodiment 3

[0052] In 1000L mother liquor, use 35% hydrochloric acid to adjust the mother liquor to pH = 3, stir for 20 minutes, then use 1.25mol / L liquid caustic soda NaOH to make it neutral, stir for 20 minutes, and the acidification is completed. Pour the acidified mother liquor into the evaporator, continue to evaporate and feed continuously, and when the solid-to-liquid ratio is about 29%, discharge the material, shake off the water, separate the sodium chloride and lithium chloride solutions, and remove the saturated sodium chloride solution Rinse once. Pour lithium chloride solution into the reaction kettle, and then add 0.9mol / L soda ash solution according to the calculated amount. During the feeding process, keep the temperature at 90-95°C, keep the temperature for 30 minutes, and then shake off the water. The obtained lithium carbonate product is packaged after drying and pulverizing. After lithium precipitation, the mother liquor and washing liquid enter the stage of acidifica...

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Abstract

The invention discloses a method for processing battery-level lithium carbonate mother liquor. The processing method comprises the following process follow: A. acidizing lithium deposition mother liquid; B. evaporating, condensing and separating out sodium; C. depositing lithium; and D circulating: circularly carrying out steps from A to C on liquid obtained by dewatering in step B and leaching in the step C and the mother liquor subjected to lithium deposition. By the adoption of the method for processing battery-level lithium carbonate mother liquor, which is disclosed by the invention, the quality of lithium chloride can be guaranteed, and lithium recovery rate can be improved greatly on the basis of the formed sealed circulation. In addition, no the industrial three wastes are discharged, therefore the purpose of clean production is achieved.

Description

technical field [0001] The invention relates to a method for treating mother liquor in the lithium industry, in particular to a method for treating battery-grade lithium carbonate mother liquor. Background technique [0002] Lithium carbonate is a basic compound of lithium, which has many industrial uses and is widely used in ceramics, glass, atomic energy, aerospace, military industry and refrigeration, welding, lithium alloys, lithium batteries, controlled nuclear fusion reactors, medicine and other fields. In addition, lithium carbonate, as a basic raw material for lithium, can be converted into various other lithium compounds. [0003] Battery-grade lithium carbonate is mainly used in the production of lithium-ion battery cathode materials such as lithium cobalt oxide, lithium iron phosphate, lithium nickel oxide, lithium manganate or nickel-cobalt lithium manganese oxide. [0004] In the production of lithium carbonate by the traditional sulfuric acid method, the balan...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01D3/04C01D15/08
Inventor 李良彬朱实贵熊训满傅利华李芳芳刘明白有仙
Owner GANFENG LITHIUM CO LTD
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