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Method for selectively extracting valuable metals from waste lithium ion battery powder based on reduced sodium roasting phase conversion

A lithium-ion battery, sodium roasting technology, applied in the direction of battery recycling, process efficiency improvement, waste collector recycling, etc., can solve the problems of large consumption of reducing agent reagents, high production costs, many processes, etc., to reduce purification and removal The effect of low burden and low production cost

Inactive Publication Date: 2020-06-09
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The all-wet process is long and has many procedures. Lithium is disorderly dispersed in intermediate products such as purified residue, raffinate, and concentrated mother liquor in each unit process, resulting in a low recovery rate of lithium; at the same time, hydrogen peroxide needs to be added during the leaching process. , sodium sulfite, SO 2 Other reagents are used as reducing agents to increase the leaching rate of cobalt and manganese. The consumption of reducing agent reagents is large and the production cost is high.

Method used

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  • Method for selectively extracting valuable metals from waste lithium ion battery powder based on reduced sodium roasting phase conversion

Examples

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Effect test

Embodiment 1

[0024] Such as figure 1 As shown, this embodiment provides a method for selectively extracting valuable metals from spent lithium-ion battery powder based on the phase transformation of the reduced sodium roasted product, including the following steps:

[0025] (1) Using waste ternary battery powder as raw material, its main composition is: Li4.5wt%, Ni20.0wt%, Co7.6wt%, Mn11.7wt%, Cu0.09wt%, Fe0.03wt%, Al0.3wt% %, C28.5wt%. Mix waste ternary battery powder with sodium sulfate in molar ratio n Li :n Na2SO4 =1:1 mixing and ball milling for 1.5h to obtain the mixture.

[0026] (2) Put the mixture obtained in the step (1) in an electric furnace for reduction and sodium roasting at 750° C. for 1.5 hours to obtain calcined sand.

[0027] (3) The calcined sand obtained in step (2) is leached with pure water, and the liquid-solid ratio is 8:1, and reacted at 80° C. for 2 hours to obtain a lithium-containing leachate and conversion slag. The lithium-containing leachate can be used...

Embodiment 2

[0031] This embodiment provides a method for selectively extracting valuable metals from spent lithium-ion battery powder based on the phase transformation of reduced sodium-calcined products, including the following steps:

[0032] (1) Using waste ternary and lithium cobalt oxide mixed battery powder as raw material, control its main composition as Li6.57wt%, Ni5.93wt%, Co42.37wt%, Mn3.79wt%, Cu0.93wt%, Fe0.08wt% %, Al0.38wt%, C24.59wt%. Mix waste lithium battery powder with sodium sulfate in molar ratio n Li :n Na2SO4 =1:1.2 Mixing and ball milling for 1.5h to obtain a mixture.

[0033] (2) Put the mixture obtained in the step (1) in an electric furnace for reduction and sodium roasting at 700° C. for 3 hours to obtain calcined sand.

[0034] (3) The calcined sand obtained in step (2) is leached with pure water, and the liquid-solid ratio is 5:1, and reacted at 40° C. for 3 hours to obtain a lithium-containing leachate and conversion slag. The lithium-containing leachate ...

Embodiment 3

[0038] This embodiment provides a method for selectively extracting valuable metals from spent lithium-ion battery powder based on the phase transformation of reduced sodium-calcined products, including the following steps:

[0039] (1) Use waste ternary and lithium manganate mixed battery powder as raw material, control its main composition as Li6.25wt%, Ni5.23wt%, Co1.32wt%, Mn48.67wt%, Cu0.61wt%, Fe0.% , Al0.26wt%, C17.89wt%. Mix waste lithium battery powder with sodium sulfate in molar ratio n Li :n Na2SO4 = 1:1 mixing and ball milling for 2 hours to obtain a mixture.

[0040] (2) Put the mixture obtained in the step (1) in an electric furnace for reduction and sodium roasting at 700° C. for 4 hours to obtain calcined sand.

[0041](3) The calcined sand obtained in step (2) is leached with pure water, and the liquid-solid ratio is 6:1, and reacted at 80° C. for 3 hours to obtain lithium-containing leachate and conversion slag, which can be used to prepare lithium carbon...

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Abstract

The invention discloses a method for selectively extracting valuable metals from waste lithium ion battery powder based on reduced sodium roasting phase conversion. The method comprises the followingsteps: mixing waste lithium ion battery powder and sodium sulfate according to a preset molar ratio, and ball milling for a preset time to obtain a mixture; placing the mixture in an electric furnacefor reductive sodium roasting at a preset temperature, wherein an obtained reductive sodium roasting product is called calcine; leaching the calcine with pure water to obtain a lithium-containing leaching solution and conversion slag; and leaching the conversion slag by sulfuric acid to extract valuable metals such as nickel, cobalt, manganese and the like. The method is simple in flow, low in production cost and high in valuable metal recovery rate; according to the method, lithium is de-intercalated from the battery powder through reductive sodium roasting to form water-soluble lithium sulfate, and selective extraction of lithium can be realized by leaching with pure water; and meanwhile, valuable metal substances such as nickel, cobalt and manganese are converted into low-valence oxideswhich are likely to acid leaching, and favorable conditions are created for recovering nickel, cobalt and manganese through subsequent wet leaching.

Description

technical field [0001] The invention belongs to the field of recycling and utilization of secondary resources, and in particular relates to a method for selectively extracting valuable metals from waste lithium ion battery powder based on the phase transformation of reduced sodium roasted products. Background technique [0002] Due to the advantages of light weight, high energy density, long cycle life, and no memory effect, lithium-ion batteries are widely used in portable electronic devices and power vehicles. However, the service life of lithium-ion batteries is generally 3-6 years. The huge lithium-ion battery application market has produced a large number of waste lithium-ion batteries, which contain valuable metals such as lithium, nickel, cobalt, and manganese and toxic electrolytes. Improper disposal will not only cause environmental pollution pollution and waste of resources. Therefore, the recovery of valuable metals in waste lithium-ion batteries has multiple mea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B1/06C22B7/00C22B26/12C22B23/00C22B47/00H01M10/54
CPCC22B1/02C22B1/06C22B7/006C22B7/007C22B23/043C22B26/12C22B47/00H01M10/54Y02W30/84Y02P10/20
Inventor 陈永明常娣胡芳石鹏飞介亚菲席炎杨声海李云何静
Owner CENT SOUTH UNIV
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