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Recovery method of lithium in waste battery

A waste battery and recovery method technology, applied in the direction of improving process efficiency, can solve the problems of increasing wastewater treatment cost, increasing the difficulty of wastewater treatment, and low purity of lithium carbonate, achieving small equipment investment, great practicality and economic value, The effect of high lithium yield

Active Publication Date: 2011-04-06
GUANGDONG BRUNP RECYCLING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Waste battery recycling companies mostly discharge it into the wastewater treatment system as industrial wastewater, which increases the difficulty of wastewater treatment and increases the cost of wastewater treatment while causing waste of resources
[0003] Today, the research on the effective recovery technology of lithium in waste batteries is mostly limited to the laboratory stage, and many studies have added saturated sodium carbonate to prepare lithium carbonate from the lithium-containing solution produced during the wet treatment of waste batteries after heating, evaporation and concentration. In fact, The concentration of lithium in the lithium-containing solution obtained in the industrial practice of wet treatment of waste batteries is very low, about 2 to 6g / L. The method of evaporation and concentration is used to enrich lithium, which requires evaporation of a large amount of water and consumes too much energy. And the lithium carbonate that this method gained is not high in purity, entrains a large amount of sulfate ion and cobalt, nickel impurity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Equipped to extract the organic phase: add 1-phenyl-3-methyl-4-benzoylpyrazolone-5 to the sulfonated kerosene solution containing 60% volume of tributyl phosphate and 40% volume to make the content 0.5mol / L; use the lithium-containing raffinate produced during the wet treatment of waste batteries as raw material, in which the lithium concentration is 3.5g / L; use 6mol / L hydrochloric acid solution as the stripping acid; use 10% to 15% The pH of the raw material was adjusted to 9 with a sodium hydroxide solution; the extraction agent was compared with the pH-adjusted raw material at a ratio of 1:2 for four-stage countercurrent extraction, and then the loaded organic phase was compared with the stripping solution at a ratio of 6:1. Carry out three-stage stripping. The lithium concentration in the obtained stripping solution is about 35g / L, the lithium concentration in the raffinate is about 0.33g / L, and the recovery rate is about 89.6%.

Embodiment 2

[0016] Equipped to extract the organic phase: add dipivaloyl ketone to the solution containing 50% tributyl phosphate and 50% sulfonated kerosene to make the content 0.25mol / L; The lithium-containing raffinate is used as the raw material, and the lithium concentration is 3.0 g / L; 7 mol / L hydrochloric acid solution is used as the stripping acid. Use 10% to 15% sodium hydroxide solution to adjust the pH of the raw material to 10; carry out five-stage countercurrent extraction of the extractant and the raw material after adjusting the pH at a ratio of 1:1.5, and then combine the loaded organic phase and the stripping solution according to the ratio of 1:1.5. 8:1 ratio for four-stage stripping. The lithium concentration in the obtained stripping solution is about 30g / L, the lithium concentration in the raffinate is about 0.45g / L, and the recovery rate is 86.27%.

Embodiment 3

[0018] Equipped to extract the organic phase: add hexanoylacetone to the solution containing 45% tributyl phosphate and 55% sulfonated kerosene to make the content 0.6mol / L; use the lithium-containing raffinate produced during the wet treatment of waste batteries as the raw material, wherein the lithium concentration is 2.8g / L; 8mol / L hydrochloric acid solution is used as the stripping acid; the pH of the raw material is adjusted to 9 with 10%-15% sodium hydroxide solution; Four-stage counter-current extraction was carried out at a ratio of 1:1, and then five-stage back-extraction was carried out between the loaded organic phase and the stripping solution at a ratio of 9:1. The lithium concentration in the obtained stripping solution is about 30.5g / L, the lithium concentration in the raffinate is about 0.43g / L, and the recovery rate is about 86.8%.

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Abstract

The invention discloses a recovery method of lithium in a waste battery. In the recovery method, with lithium-containing faffinate generated in the wet-treatment process of the waste battery as a raw material and ketone compounds, tributyl phosphate and sulphonated kerosene as extraction organic phase, the pH of value the raw material of the lithium-containing faffinate is adjusted; then the lithium-containing faffinate is subjected to multistage countercurrent extraction; lithium in the lithium-containing faffinate enters the organic phase; and the organic phase loaded with the lithium is subjected to the multistage countercurrent extraction to obtain a lithium-containing strip liquor with high purity and high concentration. The liquor can be used for subsequently preparing various high-purity lithium salts. With the technology, over 85 percent of lithium in the lithium-containing faffinate can be directly recovered for preparing the high-purity lithium salts and has remarkable recovery value.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and more specifically relates to a method for recovering lithium from a lithium-containing raffinate generated during the wet treatment of waste batteries. Background technique [0002] At present, most domestic waste lithium-ion batteries are recycled by leaching, purification and extraction wet process. The valuable metal lithium contained in the battery enters the solution along with cobalt and nickel in the acid-dissolving process. Most of it is separated from the cobalt and nickel and remains in the raffinate. Since the concentration of lithium contained in the raffinate is generally 2 to 6 g / L, which is relatively low, using the current lithium recovery technology to recover the above-mentioned lithium has low added value of recovery and utilization. Waste battery recycling companies mostly discharge it into the wastewater treatment system as industrial wastewater, which not only c...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B26/12C22B3/40
CPCY02P10/20
Inventor 李长东龙桂花谭群英蒋快良周汉章唐红辉
Owner GUANGDONG BRUNP RECYCLING TECH
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