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Method for extracting valuable metal from waste lithium ion battery material

A technology for lithium-ion batteries and valuable metals, applied in the field of extracting valuable metals, can solve problems such as secondary pollution, lithium loss, and long process flow, and achieve high-selectivity extraction, inhibition of leaching, and simple process flow Effect

Inactive Publication Date: 2019-08-16
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Aiming at the deficiencies in the prior art, the object of the present invention is to provide a method for extracting valuable metals from waste lithium ion battery materials, which can solve the problem that the existing process of recycling waste lithium ion battery positive electrode materials is long and difficult. It is prone to secondary pollution and serious loss of lithium, effectively improving the extraction rate of valuable metal elements

Method used

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  • Method for extracting valuable metal from waste lithium ion battery material

Examples

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Effect test

Embodiment 1

[0059] A method for extracting valuable metals from waste lithium-ion battery materials comprises the steps:

[0060] (1) The 100-mesh battery powder obtained after mechanical crushing and pretreatment (the powder is obtained by mixing and crushing the positive and negative electrodes of waste batteries, the shell, etc., the positive electrode material is nickel-cobalt lithium manganate ternary material, and the negative electrode material Graphite, in addition to aluminum and copper substituted into the positive and negative current collectors, and impurities such as iron introduced during the crushing process) were added to 5wt% sulfuric acid solution, and the solid-to-liquid ratio of the battery powder to the sulfuric acid solution was 200g / L to obtain a mixed material, which is heated and pressurized in an autoclave for 1 hour at a temperature of 180° C., a pressure of 2 Mpa, and a stirring speed of 800 rpm to obtain a leachate;

[0061] (2) Using NaOH to adjust the pH va...

Embodiment 2

[0070] The difference from Example 1 is that the concentration of the sulfuric acid solution in step (1) is 7wt%.

[0071] This example uses the same method as Example 1 to carry out the performance test, and the leaching rate of the obtained lithium element reaches 98%, and the contents of Ni, Co and Mn in the leaching solution are respectively 0.7g / L, 0.3g / L and 0.01g / L , the content of Al, Fe and Cu is respectively 0.001g / L, 0.001g / L and 0.001g / L, and the obtained lithium carbonate product purity is 99.56%, and lithium loss rate is 3%.

Embodiment 3

[0073] The difference from Example 1 is that step (1) is: after the lithium cobalt oxide positive electrode sheet obtained after discharge disassembly is roasted at 500°C for 5h, the obtained waste powder separated from the current collector is added to 5wt % sulfuric acid solution, the solid-to-liquid ratio of the waste powder and sulfuric acid solution is 100g / L, to obtain a mixed material, the mixed material is at a temperature of 200°C, a pressure of 3Mpa, and a stirring speed of 600rpm. Heat and pressurize in an autoclave for 1 hour to obtain a leaching solution.

[0074] This embodiment adopts the method identical with embodiment 1 to carry out performance test, and the obtained lithium element leaching rate reaches 98%, and cobalt content is 0.2g / L in the leaching solution, and the obtained lithium carbonate product purity is 99.56%, and lithium loss rate is 3.2% .

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Abstract

The invention relates to a method for extracting valuable metals from waste lithium ion battery materials. The method comprises the following steps of (1) mixing the waste lithium ion battery materials with a leaching agent to obtain a mixed material, heating and pressurizing the mixed material, and carrying out solid-liquid separation to obtain a leachate and primary solid slag; and (2) adjustingthe pH value of the leachate prepared in step (1) to obtain secondary solid slag and a lithium-containing purification solution. According to the method, the lithium in the waste lithium ion batterycan enter the solution selectively, other metal components are mainly formed in the reacted liquid in the form of solid slag. After the leachate is subjected to deep impurity removal and solid-liquidseparation, the obtained lithium-rich filtrate is used for preparing a lithium product, the solid slag obtained in the two steps further recovers the valuable metals in the product through other methods. The method is very good for the selective extraction effect of lithium, meanwhile, the method has the advantages of being low in acid consumption, no other additives, environmental friendliness and high in economic benefit.

Description

technical field [0001] The invention belongs to the field of waste lithium battery recycling, in particular to a method for extracting valuable metals from waste lithium ion battery materials. Background technique [0002] Lithium-ion batteries have attracted attention at home and abroad in recent years due to their excellent charge and discharge performance, cycle performance, and no memory effect, and have achieved rapid development. In recent years, as environmental problems have become more and more serious, new energy vehicles have become popular, and the output of lithium-ion batteries as their main power source has also increased year by year, becoming a secondary battery with a market share second only to lead-acid batteries. However, lithium-ion batteries also have a certain lifespan. When these lithium-ion batteries reach the end-of-life period, a large amount of solid waste will be generated. These discarded lithium-ion batteries have huge hidden dangers because ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B26/12C22B23/00C22B47/00C22B15/00C22B21/00C01D15/08H01M10/54
CPCC01D15/08C22B7/007C22B15/0069C22B21/0023C22B23/0423C22B26/12C22B47/00H01M10/54Y02W30/84Y02P10/20
Inventor 孙峙吕伟光王中行郑晓洪曹宏斌张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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