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Method for recovering metal elements in lithium battery anode and cathode materials

A recovery method and technology for metal elements, which are applied in the field of recovery of metal elements in positive and negative electrode materials of lithium batteries, can solve the problems of inability to eliminate bubbles, low recovery rate of valuable metals, long process cycle, etc. The effect of shortening the recovery period and increasing the reaction rate

Pending Publication Date: 2020-05-19
YINLONG ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a method for recovering metal elements in the positive and negative materials of lithium batteries, so as to solve the problems of low recovery rate of valuable metals and long process cycle in existing methods for recovering metal elements in positive and negative materials of lithium batteries , and the problem of a large number of bubbles that cannot be eliminated will be generated during the recycling process

Method used

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  • Method for recovering metal elements in lithium battery anode and cathode materials
  • Method for recovering metal elements in lithium battery anode and cathode materials

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Put 500 g of the positive and negative electrode powder of the waste lithium battery obtained after dismantling, crushing and screening into a box-type muffle furnace. 2 Reduction roasting is carried out under the atmosphere, wherein the reduction roasting temperature is 800 ° C, the reducing agent is a mixture of sodium sulfite, sodium thiosulfate and sodium bisulfite, the weight ratio of the three is 1:1:1, and the amount of reducing agent is positive 50% of the weight of negative electrode powder. After roasting for 1h, cool down to room temperature to obtain a sulfide alloy material (reduction roasting product) that removes electrolyte and organic matter, and the tail gas SO 2 Send acid system to make acid.

[0037] According to the liquid-solid weight ratio of 1:4, the sulfide alloy (reduced roasted product, 450g) and water are slurried, and then the uniformly slurried material is placed in a constant temperature water bath at 80°C for heating and water immersion,...

Embodiment 2

[0041] After dismantling, crushing and screening, 500 g of the positive and negative electrode powder of the waste lithium battery obtained after dismantling, crushing and screening, and the reducing agent are evenly mixed, and then placed in a box-type muffle furnace for reduction roasting, (wherein the reduction roasting temperature is 600° C., and the reducing agent is sodium sulfite, A mixture of sodium thiosulfate and sodium bisulfite, the weight ratio of the three is 1:1:1, and the amount of reducing agent is 50% of the weight of the positive and negative electrode powder). After roasting for 1h, cool down to room temperature to obtain a sulfide alloy material (reduction roasting product) that removes electrolyte and organic matter, and the tail gas SO 2 Send acid system to make acid.

[0042] According to the liquid-solid weight ratio of 1:3, take 450g of sulfide alloy (reduction roasting product) and water for pulping, then place the uniformly pulped material in a cons...

Embodiment 3

[0045] The difference with embodiment 1 is:

[0046] The reduction roasting temperature is 300°C, and the roasting time is 2h.

[0047] The leaching rate of valuable metal elements is Co 98.7%, Ni 98.1%, Cu 98.8%, Mn 97.3%, Li99.2%. In oxygen pressure leaching slag, the content of valuable metals in leaching slag is Co 0.27%, Ni 0.45%, Cu 0.53%, Li 0.12%, Mn 0.39%.

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Abstract

The invention provides a method for recovering metal elements in lithium battery anode and cathode materials. The method comprises the following steps of carrying out reduction roasting on the lithiumbattery anode and cathode materials and a reducing agent to obtain a reduction roasting product, wherein the reduction roasting temperature is 300-800 DEG C; carrying out heating and water leaching on the reduction roasting product and water to obtain water leached residues and water leached liquid, wherein the weight ratio of the reduction roasting product to the water is 1:(3-6), and the waterbath temperature is 60-90 DEG C; carrying out oxygen pressure leaching on the water leached residues to obtain oxygen pressure leached residues and oxygen pressure leached liquid, wherein the weight ratio of the water leached residues to the water is 1:(3-6), the reaction temperature is 130-180 DEG C, the reaction pressure is 1.2-1.7 MPa, and the oxygen partial pressure is 0.3-0.5 MPa; and mixingthe water leached liquid and the oxygen pressure leached liquid, and performing purifying to recover the valuable metal elements in a closed environment. By adopting the recovering method, the leaching rate of the metal elements in the lithium battery anode and cathode materials can be greatly improved, and the recovery period is shortened.

Description

technical field [0001] The invention relates to the field of lithium battery manufacturing, in particular to a method for recovering metal elements in positive and negative electrode materials of lithium batteries. Background technique [0002] In recent years, new energy vehicles have produced a large number of waste power batteries. If the waste power batteries are not properly recycled, there will be potential safety hazards, environmental pollution and waste of resources. At present, domestic waste lithium battery recycling is mainly based on wet method, supplemented by fire method. The wet method has become the main recovery solution due to its advantages of mild conditions and low energy consumption. Whether the efficient recovery of valuable metals can be achieved, leaching as the first step of wet recovery is very important. [0003] At present, inorganic acid and hydrogen peroxide or sodium sulfite (sodium thiosulfate) and other reducing agents are generally used f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00H01M10/54
CPCC22B7/006H01M10/54Y02W30/84Y02P10/20
Inventor 叶树宝张日阳卢卿高宁泽蔡惠群
Owner YINLONG ENERGY CO LTD
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