A method for the comprehensive recovery of valuable metals from ternary lithium battery cathode materials based on magnesium salt cycle

A ternary lithium battery and positive electrode material technology, applied in battery recycling, recycling technology, recycling by waste collectors, etc., can solve the problem of the direction of sulfate additives, the final treatment method is not clear, the final recovery rate is only 90%, and it is difficult to be economical Effectively deal with such problems as to achieve the effect of large promotion and application value, significant environmental and economic benefits, and reduced production costs

Active Publication Date: 2021-03-09
XUZHOU GUOMAO VALUABLE & RARE METAL COMPREHENSIVE UTILIZATION INST
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AI Technical Summary

Problems solved by technology

The above method uses sulfate to roast the positive electrode material of waste power batteries, and then performs leaching, separation and recovery of valuable metals, but it is mainly aimed at the separation and recovery of cobalt and lithium, and does not involve the recovery of nickel and manganese, and the final recovery rate of lithium is only 90%.
At the same time, the direction of the sulfate additive added in the roasting process in the system and the final treatment method are not clear.
The addition of magnesium sulfate will bring about the discharge and treatment of magnesium sulfate in workshop wastewater. The addition of calcium sulfate will cause a large amount of solid waste of calcium sulfate slag in the leaching process. The treatment cost is high and it is difficult to treat economically and effectively.

Method used

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  • A method for the comprehensive recovery of valuable metals from ternary lithium battery cathode materials based on magnesium salt cycle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Sulfation roasting: weigh 30gMgSO 4 .7H 2 O and 50g of ternary lithium battery cathode powder were mixed, and calcined at 900°C for 1h under anaerobic conditions to obtain 53.6g of calcined slag.

[0032] (2) Water immersion: mix the calcined material with water for water immersion, the liquid-solid ratio of water immersion is 3:1mL / g, the temperature is 50°C, and the time is 0.5h. After water immersion and filtration, a lithium-containing solution with a lithium concentration of 9.8 g / L was obtained. 41.84 g of filter residue was obtained, which contained 0.019% lithium, 15.4% nickel, 9.3% cobalt and 44.3% manganese.

[0033] (3) Concentrate and remove impurities from the lithium-containing filtrate, then add sodium carbonate to carry out alkali precipitation to obtain a lithium carbonate product.

[0034] (4) Acid leaching: Take the water leaching slag in step (2), add water according to the liquid-solid ratio of 5:1mL / g, add concentrated sulfuric acid according ...

Embodiment 2

[0041] (1) Sulfation roasting: weigh 35gMgSO 4 .7H 2 O, 50g of ternary lithium battery positive electrode powder, mixed, and roasted at 300°C for 3 hours under anaerobic conditions to obtain 56.9g of roasted slag.

[0042] (2) Water immersion: mix the calcined material with water for water immersion, the liquid-solid ratio of water immersion is 4:1mL / g, the temperature is 60°C, and the time is 1h. After water immersion and filtration, a lithium-containing solution with a lithium concentration of 6.97 g / L was obtained. 42.4 g of filter residue was obtained, which contained 0.015% lithium, 14.4% nickel, 8.8% cobalt and 41.7% manganese.

[0043] (3) Concentrate and remove impurities from the lithium-containing filtrate, add sodium carbonate to carry out alkali precipitation to obtain lithium carbonate product

[0044] (4) Acid leaching: take the water leaching residue in step (2), add water according to the liquid-solid ratio of 4:1mL / g, add concentrated sulfuric acid accordin...

Embodiment 3

[0051] (1) Sulfation roasting: weigh 50gMgSO 4 .7H 2 O, 50g of ternary lithium battery cathode powder, mixed, and roasted at 700°C for 5h under anaerobic conditions to obtain 63.39g of roasted slag.

[0052] (2) Water immersion: mix the calcined material with water for water immersion, the liquid-solid ratio of water immersion is 5:1mL / g, the temperature is 80°C, and the time is 1h. After water immersion and filtration, a lithium-containing solution with a lithium concentration of 6.59 g / L was obtained. 41.61 g of filter residue was obtained, which contained 0.01% lithium, 13.7% nickel, 8.3% cobalt and 39.4% manganese.

[0053] (3) Concentrate and remove impurities from the lithium-containing filtrate, add sodium carbonate to carry out alkali precipitation to obtain a lithium carbonate product.

[0054] (4) Acid leaching: take the water leaching slag in step (2), add water according to the liquid-solid ratio of 3:1mL / g, add concentrated sulfuric acid according to the acid-m...

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Abstract

The invention discloses a method for comprehensively recovering valuable metals from the cathode material of a ternary lithium battery based on magnesium salt circulation. Firstly, magnesium sulfate and the cathode powder of a ternary lithium battery are mixed in proportion and then roasted under anaerobic conditions to obtain a roasted material. Lithium-containing filtrate and water leaching slag are obtained by water immersion and filtration of roasting materials. Lithium-containing filtrate is removed by impurity and alkali precipitation to realize the priority recovery of lithium. , wherein the magnesium element is prepared to obtain the magnesium sulfate product, which is recycled in the system. The invention can realize the comprehensive recovery of all valuable metal components of nickel, cobalt, manganese and lithium, and simultaneously realize the recycling and reuse of magnesium sulfate in the system, which is beneficial to reducing the discharge of magnesium-containing wastewater and simultaneously reducing production costs.

Description

technical field [0001] The invention relates to a method for recovering positive electrode materials of ternary lithium batteries, in particular to a method for comprehensively recovering valuable metals from positive electrode materials of ternary lithium batteries based on magnesium salt circulation, and belongs to the technical field of recovery of valuable metals. Background technique [0002] With the explosive growth of the use of new energy vehicles, waste power lithium-ion batteries will be one of the main solid wastes in cities in my country in the future, and their metal content is much higher than that in ores, which is a typical " Urban Minerals" are of great recycling value. Due to high energy density, high tap density, and large specific capacity, ternary lithium batteries account for an increasing proportion of the power battery market and gradually become the mainstream of power batteries. Ternary power lithium-ion batteries contain a large amount of valuable...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/54C22B7/00C22B1/02C22B23/00C22B3/38C22B26/12C22B26/22C22B47/00
CPCC22B1/02C22B7/006C22B23/0453C22B26/12C22B26/22C22B47/00C22B3/3846H01M10/54Y02W30/84Y02P10/20
Inventor 张邦胜刘贵清张帆王芳解雪曲志平张保明
Owner XUZHOU GUOMAO VALUABLE & RARE METAL COMPREHENSIVE UTILIZATION INST
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