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Preparation method of battery-grade lithium hydroxide

A lithium hydroxide, battery-level technology, applied in the direction of lithium oxide;/hydroxide, battery recycling, waste collector recycling, etc., can solve the problems of high recycling cost, low purity of lithium products, and increased economic costs, etc., to achieve The effect of reducing lithium recovery cost, improving lithium recovery rate and improving production efficiency

Pending Publication Date: 2022-05-13
NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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AI Technical Summary

Problems solved by technology

The whole system wet recovery method has the following problems: using direct acid leaching, almost all the valuable metals in the positive electrode material are leached into the solution, and the lithium in the solution will have an adverse effect on the subsequent recovery of nickel and cobalt; the concentration of lithium in the raffinate At the same time, part of the lithium is entrained or extracted by miscible phases, and a large amount of evaporation and concentration is required to meet the requirements of lithium precipitation, resulting in high recovery costs and low lithium recovery rates; the raffinate contains a large amount of sodium ions, resulting in low purity of lithium products , it is difficult to prepare battery-grade lithium salt products
In this method in the prior art, there are toxic gases such as carbon monoxide during the entire roasting process, and additional tail gas treatment is required, and the requirements for roasting equipment are relatively high, which not only increases economic costs, but also causes safety issues such as environmental pollution

Method used

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  • Preparation method of battery-grade lithium hydroxide
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preparation example Construction

[0028] The invention provides a method for preparing battery-grade lithium hydroxide, comprising:

[0029] Roasting after mixing the waste ternary positive electrode powder and sulfate to obtain a roasted material;

[0030] filtering the calcined material after water immersion to obtain water immersion liquid and water immersion slag;

[0031] After the transformation reaction of the water immersion solution and quicklime, filtration is obtained to obtain transformation lithium liquid and calcium slag;

[0032] After mixing the transformation lithium liquid with the impurity remover and the purifying agent, filter to obtain lithium hydroxide solution and filter residue;

[0033] The lithium hydroxide solution is crystallized to obtain battery grade lithium hydroxide.

[0034] In the present invention, the preparation method of the waste ternary positive electrode powder preferably includes:

[0035] The waste ternary lithium battery is discharged, crushed, pyrolyzed and sor...

Embodiment 1

[0073] Place the waste ternary lithium battery in a 0.8mol / L NaCl solution for discharge treatment. After the discharge is completed, the waste lithium battery is cleaned, dried and crushed. After crushing, it is placed in a rotary kiln for pyrolysis under the protection of nitrogen. The pyrolysis temperature is 300°C, and finally the waste ternary cathode powder is obtained by sorting.

[0074] Mix 500g of the waste ternary positive electrode powder obtained from the pretreatment with 500g of sodium bisulfate evenly, and send it to a high-temperature furnace for calcination at a temperature of 500°C for 1 hour.

[0075] Add the roasted waste ternary positive electrode powder into pure water and stir to leaching, control the liquid-solid ratio of the water immersion to 4:1, the temperature is 80°C, and the time is 1h. The slurry after water immersion is press-filtered to obtain the water immersion liquid For subsequent processes, the water leaching residue is used to recover n...

Embodiment 2

[0081] Place the waste ternary lithium battery in a 1.5mol / L NaCl solution for discharge treatment. After the discharge is completed, the waste lithium battery is cleaned, dried and crushed. After crushing, it is placed in a rotary kiln for pyrolysis under the protection of nitrogen. The pyrolysis temperature is 350°C, and finally the waste ternary cathode powder is obtained by sorting.

[0082] Mix 500g of the pretreated waste ternary cathode powder with 600g of sodium bisulfate evenly, and send it to a high-temperature furnace for calcination at a temperature of 600°C for 2 hours.

[0083] Add the roasted waste ternary positive electrode powder into pure water and stir for leaching, control the liquid-solid ratio of the water immersion to 5:1, the temperature is 60°C, and the time is 2h. The slurry after water immersion is press-filtered to obtain the water immersion liquid For subsequent processes, the water leaching residue is used to recover nickel, cobalt and manganese. ...

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Abstract

The invention provides a method for preparing battery-grade lithium hydroxide by recycling a waste ternary lithium battery, which comprises the following steps of: uniformly mixing waste ternary positive electrode powder obtained by pretreatment with sulfate, roasting to convert lithium into soluble lithium sulfate, and leaching with pure water to obtain a lithium-containing solution; lithium hydroxide is prepared from the water leaching liquid through the procedures of lithium salt transformation, lithium liquid impurity removal, evaporative crystallization and the like, and water leaching residues can be used for recycling nickel, cobalt and manganese. According to the method, lithium is preferentially recycled through combination of a pyrogenic process and a wet process, so that the loss of lithium is reduced, the recycling rate of lithium is increased, the recycling cost is reduced, and the production income is effectively increased; the purity of the recycled and prepared lithium hydroxide reaches 99% or above and reaches the industrial standard of battery-grade lithium hydroxide, and the whole recycling process is short in flow and simple and has extremely high economic benefits.

Description

technical field [0001] The invention belongs to the technical field of recycling waste lithium batteries, and in particular relates to a method for preparing battery-grade lithium hydroxide, specifically the recovery of non-ferrous metals in waste lithium batteries, and a method for preparing battery-grade lithium hydroxide using waste ternary lithium batteries as raw materials Methods. Background technique [0002] In recent years, China's electric vehicle industry has developed rapidly, and the sales of electric vehicles in China are increasing day by day, but the average service life of power batteries in electric vehicles is about 10 years. Electric vehicles that entered the market early have now entered the battery decommissioning stage. According to market research forecasts, by 2020, the amount of scrapped lithium batteries for vehicles in my country will reach 32GWh, and the quality of scrapped batteries will reach about 500,000 tons; The amount of scrapped lithium b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D15/02H01M10/54
CPCC01D15/02H01M10/54C01P2006/80Y02W30/84
Inventor 王本平申屠华剑彭伟文张梦龙
Owner NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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