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A method for preparing lithium carbonate and ternary precursors by recycling waste ternary lithium batteries

A ternary lithium battery and a ternary battery technology, applied in the field of solid waste recycling, can solve the problems affecting the quality of nickel-cobalt-manganese precursors and the reduction of lithium recovery rate, so as to reduce the difficulty of acid leaching and high recovery rate of valuable metals , the effect of shortening the process

Active Publication Date: 2022-02-11
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when P507 is used for extraction, lithium will also be extracted into the organic phase, and will enter the stripping solution during back extraction, thereby affecting the quality of the nickel-cobalt-manganese precursor, and will also lead to a significant reduction in the recovery rate of lithium.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Put the waste ternary lithium-ion battery into salt water for discharge, then disassemble, crush and sieve. Take 50g of the undersize powder, and roast it under the condition of 550°C for 2h without air. The roasted product and 200mL water were mechanically stirred and leached at 45°C, and CO was continuously introduced at a flow rate of 200mL / min. 2 . After the reaction, the lithium-containing water immersion liquid and water leaching residue were obtained by solid-liquid separation. After testing and calculation, the leaching rate of lithium reached 90.2%, and the leaching rates of nickel, cobalt, and manganese were 0.65%, 0.08%, and 0.12%, respectively. Lithium-containing water The immersion solution is evaporated and crystallized at 100° C. to obtain a lithium carbonate product with a purity of more than 99%. The water leaching residue is acid-leached with sulfuric acid whose total molar weight of nickel, cobalt and manganese is 1.4 times, acid leaching for 2 hour...

Embodiment 2

[0026] Put the waste ternary lithium-ion battery into salt water for discharge, then disassemble, crush and sieve. Take 50g of undersize powder, and roast it in air isolation at 600°C for 3h. The roasted product was leached with 250 mL of water under mechanical stirring at 40 °C, and CO was continuously introduced at a flow rate of 100 mL / min. 2 . After the reaction, the lithium-containing water immersion solution and water leaching residue were obtained by solid-liquid separation. After testing and calculation, the leaching rate of lithium reached 91.3%, and the leaching rates of nickel, cobalt, and manganese were 0.64%, 0.05%, and 0.16%, respectively. Lithium-containing water The immersion solution is evaporated and crystallized at 100° C. to obtain a lithium carbonate product with a purity of more than 99%. The water leaching residue is acid-leached with sulfuric acid which is 1.2 times the total molar weight of nickel-cobalt-manganese, acid-leached for 1 hour at a solid-...

Embodiment 3

[0028] Put the waste ternary lithium-ion battery into salt water for discharge, then disassemble, crush and sieve. Take 50g of the undersize powder, and roast it under the condition of 650°C for 1h without air. The roasted product and 300mL water were mechanically stirred and leached at 25°C, and CO was continuously introduced at a flow rate of 150mL / min. 2. After the reaction, the lithium-containing water immersion solution and water leaching residue were obtained by solid-liquid separation. After testing and calculation, the leaching rate of lithium reached 90.4%, and the leaching rates of nickel, cobalt, and manganese were 0.69%, 0.09%, and 0.18%, respectively. Lithium-containing water The immersion solution is evaporated and crystallized at 100° C. to obtain a lithium carbonate product with a purity of more than 99%. The water leaching residue is acid-leached with sulfuric acid whose total molar weight of nickel, cobalt and manganese is 1.6 times, acid leaching for 3 hou...

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Abstract

The invention discloses a method for preparing lithium carbonate and a ternary precursor by recycling waste ternary lithium batteries, belonging to the field of solid waste recycling. The graphite and binder contained in the black powder obtained after the pretreatment of waste ternary batteries are used as reducing agents to destroy the structure of ternary materials through self-reduction phase transformation; the method of carbonation and water immersion is used to convert lithium carbonate into Lithium bicarbonate, which is easy to immerse in water, realizes the preferential leaching of lithium; the material after lithium extraction does not need to add a reducing agent, and is directly leached with sulfuric acid to obtain a nickel-cobalt-manganese solution. Deeply remove impurities such as copper, iron, and calcium in the solution through the impurity removal process, and control the content of aluminum and magnesium in the solution, and then use simultaneous extraction to extract nickel, cobalt, and manganese in the solution into the organic phase, and back-extract with sulfuric acid Finally, a nickel, cobalt, and manganese sulfate solution is obtained, and a high-quality ternary cathode material precursor can be prepared after adjusting the metal ratio. The invention has the advantages of high recovery rate of valuable metal lithium, nickel, cobalt and manganese, short process, good product quality, economical and environmental protection.

Description

technical field [0001] The invention belongs to the field of solid waste recycling, and in particular relates to a method for recycling waste ternary lithium batteries to prepare battery-grade lithium carbonate and ternary precursors. Background technique [0002] With the development of the power vehicle industry, the output and demand of lithium-ion batteries are increasing year by year. Since the effective life of lithium-ion batteries is 5 to 8 years, the amount of scrapped power batteries is also increasing year by year. It is estimated that 350,000 tons of waste lithium-ion batteries will be produced in 2025. Battery. Waste lithium-ion batteries contain organic substances and heavy metals. If they are directly discharged, they will cause environmental pollution and endanger human health. In addition, waste lithium-ion batteries contain valuable metals such as Li, Ni, Co, Mn, Cu, etc. The price of these metals is relatively high. Therefore, the efficient and green recy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/54C01D15/08C01G53/00
CPCC01D15/08C01G53/006H01M10/54Y02W30/84
Inventor 张家靓王成彦梁国强杨成陈永强
Owner UNIV OF SCI & TECH BEIJING
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