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Method for preparing battery level lithium carbonate by using lithium chloride solution

A lithium chloride, lithium carbonate technology, applied in lithium carbonate;/acid carbonate, battery electrodes, circuits, etc., can solve problems such as high cost and complex technology, and achieve low production cost, simple process, The effect of good economic and social benefits

Active Publication Date: 2009-12-23
GANFENG LITHIUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcoming of high cost and complicated technology of the prior art, provide a kind of method utilizing lithium chloride solution to prepare battery-grade lithium carbonate, this method technology is simple and practical, production cost is low, product quality is stable, has relatively good economic and social benefits

Method used

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  • Method for preparing battery level lithium carbonate by using lithium chloride solution
  • Method for preparing battery level lithium carbonate by using lithium chloride solution

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Embodiment 1

[0031] Lithium chloride solution of 5 cubic meters, the calcium content in the lithium chloride solution of sampling analysis is 0.025g / l, will obtain lithium chloride solution and add pure water 7m 3 , the content of lithium chloride in the sampling analysis solution is 100g / l, be warmed up to 95 ℃, and add 2.33kg EDTA and 17kg mass concentration and be 30% liquid caustic soda, after stirring for 20 minutes, slowly add the carbonic acid of 220g / l wherein Sodium solution 7m 3 , the dropping time is 1.5 hours, keep the temperature for 1 hour after the addition, centrifuge, add pure water to rinse each time with a mass ratio of pure water to lithium carbonate of 1:2.5, rinse three times, and then dry at 140°C for 30 minutes , jet crushing to D 50 Obtain qualified battery grade lithium carbonate 685kg for 4.2 μm, the direct recovery rate of lithium is 65.4%. EDTA is ethylenediaminetetraacetic acid (Ethylene DiamineTetraacetic Acid), which is a complexing agent.

[0032] Such a...

Embodiment 2

[0038] at 2.5m 3 Add 2.5kg of activated carbon to the brine, absorb the organic matter in the brine at 80°C for 1 hour, and then press filter, raise the temperature of the press-filtered brine to 100°C, add liquid caustic soda to it, heat up and stir, adjust the pH to about 13, separate by plate pressure, and use 2.5m 3 Wash the magnesium hydroxide with water countercurrently for two times. After washing, mix the lotion and the mother liquor and pass carbon dioxide into it. The pH at the end point is controlled at 7, and 12 kg of activated carbon is added to it. The temperature is raised to 75°C, kept at a constant temperature for 1 hour, and press-filtered After the solution is sampled and analyzed, the calcium content in the lithium chloride solution is 0.03g / l, and the obtained lithium chloride solution is added to pure water for 7m 3 , the lithium chloride content in the sampling analysis solution is 100g / l, is heated up to 95 ℃, and adds 2.8kgEDTA and 17kg mass concentra...

Embodiment 3

[0040] at 2.5m 3Add 2.5kg of activated carbon to the brine, absorb the organic matter in the brine at 75°C for 1 hour, and then press filter, raise the temperature of the filtered brine to 100°C, add liquid caustic soda to it, heat up and stir, adjust the pH to about 13, separate by plate pressure, and use 3m 3 Wash the magnesium hydroxide with water countercurrently for two times. After washing, mix the lotion and the mother liquor and pass carbon dioxide into it. The final pH is controlled at 7, and 12kg of activated carbon is added to it. The temperature is raised to 75°C, kept at a constant temperature for 1 hour, and press-filtered After the solution is sampled and analyzed, the calcium content in the lithium chloride solution is 0.04g / l, and the obtained lithium chloride solution is added to pure water for 15m 3 , the lithium chloride content in the sampling analysis solution is 60g / l, is warmed up to 97 ℃, and adds 2.5kgEDTA and 24kg mass concentration and is 30% liqui...

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Abstract

The invention provides a method for preparing battery level lithium carbonate by using lithium chloride solution. The method includes the steps of the dilution of lithium chloride solution, lithium sedimentation in sodium carbonate, the separation of lithium carbonate, washing, drying, grinding and packing. The method is simple in technology, easy in operation and low in production cost, and the obtained product, namely, battery level lithium carbonate, has the advantages of low sulfate radical content, stable quality, high utilization rate of resources and suitability for the production and application of lithium ion battery raw materials, and has extensive market prospect, as well as favorable economic and social benefit.

Description

technical field [0001] The invention belongs to the field of battery materials, and in particular relates to a method for preparing battery-grade lithium carbonate from a lithium chloride solution. 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. Battery-grade lithium carbonate is mainly used to produce lithium-ion battery cathode materials such as lithium cobaltate, lithium iron phosphate, lithium nickelate, lithium manganate or lithium nickel-cobalt manganese oxide. % speed increase. Battery grade lithium carbonate is mainly produced by lithium sulfate transformation method produced ...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/58C01D15/08
CPCC01D15/08
Inventor 李良彬胡耐根黄学武葛钰玮朱实贵熊训满马振千
Owner GANFENG LITHIUM CO LTD
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