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Method for recovering cobalt and lithium from waste lithium cobaltite and preparing lithium cobaltite

A waste lithium cobaltate and lithium cobaltate technology, which is applied in the fields of materials, resource recycling and metallurgy, can solve the problems of high energy consumption and high recycling cost, and achieve the effects of low energy consumption, low consumption of auxiliary materials and simple process

Inactive Publication Date: 2011-06-22
HUNAN BRUNP RECYCLING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Recovering cobalt and lithium separately leads to high recovery cost and high energy consumption, but there is no effective method for simultaneously recovering cobalt and lithium at the same time

Method used

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  • Method for recovering cobalt and lithium from waste lithium cobaltite and preparing lithium cobaltite
  • Method for recovering cobalt and lithium from waste lithium cobaltite and preparing lithium cobaltite
  • Method for recovering cobalt and lithium from waste lithium cobaltite and preparing lithium cobaltite

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Take 2kg of spent lithium cobaltate, add 10L of water, add 1.7L of 98% sulfuric acid, slowly add 1.2L of 30% hydrogen peroxide, keep the temperature at about 65°C, keep stirring, react for 1.5h, and filter to obtain about 12L of filtrate. The copper in the solution was measured to be 10 mg / L, and 1.8 g of iron powder was added, stirred continuously, reacted for half an hour, and filtered to obtain about 12 L of filtrate. Add sodium carbonate to adjust the pH value of the solution after copper removal to 5.0 to remove iron and aluminum, keep stirring during the reaction and keep the system temperature at 70°C, and filter after the pH value reaches 5.0. After removing iron and aluminum, the calcium and magnesium in the solution were measured to be 5 mg / L and 65 mg / L, respectively, and 5 g of sodium fluoride was added. During the reaction, the temperature of the system was kept at 80 ° C with continuous stirring, and after half an hour of reaction, it was filtered. The sol...

Embodiment 2

[0031] Take 2kg of waste lithium cobaltate, add 10L of the filtrate after the precipitation of cobalt lithium in Example 1, add 2.1L of 36% hydrochloric acid and 1L of 98% sulfuric acid, slowly add 150g of iron powder, keep the temperature at about 65°C, and continue stirring. After reacting for 1.5h, filter to obtain about 10L of filtrate. Add sodium hydroxide to adjust the pH value of the solution after copper removal to 4.8 to remove iron and aluminum, keep stirring during the reaction and keep the system temperature at 85°C, and filter after the pH value reaches 4.8. Calcium and magnesium in the solution after iron and aluminum removal were measured to be 5mg / L and 65mg / L, respectively, and 5g of sodium fluoride was added. During the reaction, the temperature of the system was kept at 80°C with continuous stirring, and after half an hour of reaction, the solution was filtered to obtain the solution after removal of impurities. About 10L, its composition is shown in Table 2...

Embodiment 3

[0036] Take 2kg of waste lithium cobaltate, add 10L of the filtrate after cobalt lithium precipitation in Example 2, add 1.7L of 98% sulfuric acid, slowly add 300g of sodium metabisulfite, keep the temperature at about 65°C, keep stirring, react for 1.5h, filter, Get about 10L of filtrate. The copper in the solution was measured to be 12 mg / L, and 2.0 g of iron powder was added, stirred continuously, reacted for half an hour, and filtered to obtain about 10 L of filtrate. Add ammonium carbonate to adjust the pH value of the solution after copper removal to 5.0 to remove iron and aluminum. During the reaction, keep stirring and keep the system temperature at 90°C. Filter after the pH value reaches 5.0. Calcium and magnesium in the solution after iron and aluminum removal were measured to be 10mg / L and 70mg / L respectively, and 7g of sodium fluoride was added, stirring was continued during the reaction and the temperature of the system was kept at 85°C, the reaction was filtered ...

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Abstract

The invention discloses a method for recovering cobalt and lithium from waste lithium cobaltite and preparing lithium cobaltite. The method comprises the following steps: (1) leaching out the cobalt and lithium in the waste lithium cobaltite by using acid and a reducing agent, so as to obtain lixivium; (2) removing copper, iron, aluminum, calcium and magnesium in the lixivium by using a chemical method; (3) precipitating the cobalt and lithium in a solution without impurities with carbonate; (4) drying the cobalt lithium carbonate, and blending corresponding cobalt salt and / or lithium salt according to cobalt-lithium ratio; and (5) calcining so as to obtain lithium cobaltite product. The lithium cobaltite obtained by the method is good in property, cobalt and lithium recoveries are above 99% and above 96% respectively. The method has the advantages of simple process, low cost and high economic benefits, and is easy to carry out industrial production.

Description

technical field [0001] The invention relates to the technical fields of resource recycling and metallurgy and materials, in particular to a method for recovering cobalt lithium from waste lithium cobaltate and preparing lithium cobaltate. Background technique [0002] At present, the recovery of valuable metals from waste lithium cobalt oxide batteries is basically through leaching, impurity removal and separation to recover cobalt and lithium respectively. For example, in the patent document whose patent number is CN03113915 and titled "Method for recovering metal from waste lithium-ion batteries", a physical and chemical method is proposed to recover metal copper and cobalt by electrolysis after leaching and removing impurities. Salt precipitation recovers lithium. In the patent document CN101280357 and titled "An Environmentally Friendly Acid Leaching Extraction Process in the Recycling of Waste Lithium Batteries", a chemical method is proposed to treat waste lithium bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/00H01M10/54
CPCY02E60/12Y02W30/84
Inventor 谭群英李长东汤婕刘更好张立新蒋快良
Owner HUNAN BRUNP RECYCLING TECH
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