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Method for preparing lithium carbonate and ternary precursor by recycling waste ternary lithium battery

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

Active Publication Date: 2021-02-19
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 whose total molar weight of nickel, cobalt and manganese is 1.2 times, acid leaching for 1 hour under the...

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 a waste ternary lithium battery, and belongs to the field of solid waste recycling. Graphite and abinder carried in black powder obtained after pretreatment of a waste ternary battery are adopted as reducing agents, and the structure of the ternary material is destroyed through self-reduction phase inversion; lithium carbonate is converted into lithium bicarbonate which is easy to leach with water by adopting a carbonation water leaching method, so as to realize the preferential leaching of lithium; and sulfuric acid leaching is directly performed on the material subjected to lithium extraction without adding a reducing agent to obtain a nickel-cobalt-manganese solution. Copper, iron, calcium and other impurities in the solution are deeply removed through an impurity removal procedure, the content of aluminum and magnesium in the solution is controlled, then nickel, cobalt and manganese in the solution are extracted into an organic phase through synchronous extraction, a nickel sulfate solution, a cobalt sulfate solution and a manganese sulfate solution are obtained after reverseextraction is conducted through sulfuric acid, and a high-quality ternary positive electrode material precursor can be prepared after the metal proportion is adjusted. The method provided by the invention has the advantages of high recovery rate of valuable metals including lithium, nickel, cobalt and manganese, short flow, good product quality, economy and environment-friendliness.

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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IPC IPC(8): C01D15/08C01G53/00H01M10/54
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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