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Manganese dioxide recovery method by waste lithium ion battery powder selective lithium-extracting and electrolytic separation

A lithium-ion battery, manganese dioxide technology, applied in battery recycling, waste collector recycling, electrolysis process and other directions, can solve the problems of high production cost, low lithium recovery rate, difficult separation of lithium and sodium, etc., to achieve high-efficiency separation, quality excellent effect

Active Publication Date: 2020-06-09
CENT SOUTH UNIV
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  • Claims
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Problems solved by technology

[0004] In order to solve the problems of low lithium recovery rate, difficult separation of lithium and sodium, and high production cost in the current wet treatment process of waste lithium ion battery powder, the present invention provides a method for selectively extracting lithium from waste lithium ion battery powder and electrolytically separating and recovering manganese dioxide. method, the specific steps are as follows:

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  • Manganese dioxide recovery method by waste lithium ion battery powder selective lithium-extracting and electrolytic separation

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Embodiment 1

[0027] Such as figure 1 As shown, the present embodiment provides a method for selectively extracting lithium from waste lithium-ion battery powder and electrolytically separating and recovering manganese dioxide. The specific steps include the following:

[0028] (1) Mature roasting: using waste ternary lithium-ion battery powder as raw material, its main composition is Li4.38%, Ni18.72%, Co7.87%, Mn11.23%, Cu0.63%, Fe0.25% , Al0.92%. Weigh a certain amount of waste lithium-ion battery powder, add it according to n H2SO4 :n Li =0.95 (molar ratio) Slowly add concentrated sulfuric acid and stir evenly, then put it into an electric furnace and bake at 550°C for 2h, take out the calcined sand and cool it to room temperature, and then grind it evenly.

[0029] (2) Water immersion: put the evenly ground calcined sand into the leaching reactor, add pure water, mechanically stir and leaching for 3 hours at a liquid-solid ratio of 4:1, and a temperature of 60°C, and filter and sepa...

Embodiment 2

[0035] Such as figure 1 As shown, the present embodiment provides a method for selectively extracting lithium from waste lithium-ion battery powder and electrolytically separating and recovering manganese dioxide. The specific steps include the following:

[0036] (1) Slaking and roasting: use waste ternary and lithium cobalt oxide mixed battery powder as raw material, control its main composition as Li6.76%, Ni14.43%, Co42.56%, Mn10.86%, Cu0.42%, Fe0.15%, Al0.38%. Weigh a certain amount of waste lithium-ion battery mixed powder, add it according to n H2SO4 :n Li =1.1 (molar ratio) Slowly add concentrated sulfuric acid and stir evenly, then put it into an electric furnace and bake at 650°C for 2h, take out the calcined sand and cool it to room temperature, and then grind it evenly.

[0037] (2) Water immersion: put the evenly ground calcine into the leaching reactor, add pure water, mechanically stir and leaching for 5 hours at a liquid-solid ratio of 3:1, and a temperature...

Embodiment 3

[0043] Such as figure 1 As shown, the present embodiment provides a method for selectively extracting lithium from waste lithium-ion battery powder and electrolytically separating and recovering manganese dioxide. The specific steps include the following:

[0044] (1) Slaking and roasting: use waste ternary and lithium manganate mixed battery powder as raw material, control its main composition as Li6.25%, Ni15.23%, Co12.56%, Mn49.79%, Cu0.53%, Fe0.12%, Al0.36%. Weigh a certain amount of waste lithium-ion battery mixed powder, add it according to n H2SO4 :n Li =1.5 (molar ratio) Slowly add concentrated sulfuric acid and stir evenly, then put it into an electric furnace and bake at 750°C for 4h, take out the calcined sand and cool it to room temperature, and grind it evenly.

[0045] (2) Water immersion: put the evenly ground calcine into the leaching reactor, add pure water, mechanically stir and leaching for 2 hours at a liquid-solid ratio of 8:1, and a temperature of 90°C...

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Abstract

The invention discloses a manganese dioxide recovery method by waste lithium ion battery powder selective lithium-extracting and electrolytic separation. The method comprises the steps that a certainamount of waste lithium ion battery powder is weighed, concentrated sulfuric acid is added, and the mixture is fully stirred and mixed; the acid-stirred-and-mixed battery powder is placed in an electric furnace for being roasted at a certain temperature for a predetermined time; the roasted battery powder is mechanically stirred and leached with pure water at a predetermined temperature; slurry issubjected to liquid-solid separation, filter residue is fed to a wet method nickel-cobalt-manganese recovery system, and impurities of a lithium-containing leaching solution are removed by using sulfide precipitation and oxidation neutralization precipitation step by step; a lithium-containing purification solution electrolyzes to produce manganese dioxide powder at a predetermined current density, acidity and temperature; and after residual manganese ions of the lithium-containing solution after electrolytic manganese precipitation are removed, and a saturated sodium carbonate solution is added for carbonization lithium precipitation to produce lithium carbonate powder. The method creates good conditions for the subsequent recovery of nickel and cobalt by sulfuric acid leaching, and canrealize the efficient separation of lithium and manganese in lithium-rich liquid through electrodeposition, and comprehensively recover a electrolytic manganese dioxide product.

Description

technical field [0001] The invention relates to the technical field of waste lithium ion battery recycling and utilization, in particular to a method for selectively extracting lithium from waste lithium ion battery powder and separating and recovering lithium and manganese in solution. Background technique [0002] Lithium-ion batteries have been widely used in mobile electronic devices, power vehicles, energy storage and other fields due to their excellent characteristics such as high energy density, long cycle life, low self-discharge rate, low pollution, and no memory effect. It is estimated that in 2025, the decommissioning and scrapping of power batteries will be about 93GWh, and the market economy will reach 37.9 billion yuan. The recycling of waste lithium-ion batteries is of great significance for environmental protection and comprehensive utilization of resources. [0003] At present, the mainstream process of resource recovery and utilization of waste lithium bat...

Claims

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Application Information

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IPC IPC(8): C22B26/12C22B7/00C22B1/06C22B47/00C25B1/21C01D15/08H01M10/54
CPCC01D15/08C22B1/06C22B7/007C22B26/12C22B47/00C25B1/21H01M10/54Y02W30/84Y02P10/20
Inventor 陈永明石鹏飞胡芳常娣介亚菲席炎杨声海李云何静
Owner CENT SOUTH UNIV
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