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Method for recycling metal in lithium ion battery through inorganic acid leaching-bioleaching collaboration

A technology of biological leaching and ion battery, applied in the direction of improving process efficiency, can solve the problems of large amount of inorganic acid, inability to leaching metal, and increase operating cost, so as to improve the leaching rate, reduce the amount of acid, and consume less acid. Effect

Active Publication Date: 2018-07-17
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Inorganic acid leaching is generally used, but not only the amount of inorganic acid is large, but also acid mist is easily generated, the environmental conditions are poor, and the environmental protection is not up to standard, so the acid mist must be collected and treated, which increases the operating cost. Moreover, after acid leaching, there are still some metals that cannot be extracted. leaching

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1. Domestication of Thiobacillus ferrooxidans

[0022] The CHFe bacteria were first activated three times, and then domesticated for 6 months. The domestication steps are as follows: the activated CHFe bacterium liquid is taken in the Erlenmeyer flask of 20ml to 105ml 9K culture fluid, the initial pH is adjusted to 1.8-3 (the best is 2), add 0.1-0.15g (the best is 0.125g ) mixed electrode material powder, mixed evenly and placed on a shaker, 30 ° C, 120r min -1 Under the mixed culture for 14 days, the pH value was measured every 24 hours until the pH remained in the range of 1.8-3.5 and did not rise. Repeat the above steps again, but increase the dosage of the mixed electrode material by 10% in each repetition, continue the acclimatization and cultivation until the powder concentration of the mixed electrode material increases to 1.5-2.0g / L, and the last cycle is after the 14th day , CHFe bacteria maintain the pH in the range of 2-3 for the 1.5-2.0g / L mixed electrode ...

Embodiment 2

[0031] Battery dismantling: Disassemble the waste lithium-ion battery to remove the casing, discharge, and pulverize to obtain 1.5 kg of powder of positive and negative mixed electrode materials.

[0032] Acid leaching: Put 1.5kg of the obtained positive and negative mixed electrode material powder into the first reaction tank, add H at a solid-liquid mass volume ratio of 1:13 2 SO 4 (concentration 0.75mol / L)-H 2 o 2 (1:1)19.5m 3 , reacted and mixed for 3 hours to obtain a solution containing heavy metals and electrode powder with a pH of 2, and put the solution into the second reaction tank.

[0033] Bioleaching: add 1m in the second reaction pool 3 The CHFe bacterial liquid and 9K culture liquid (1:5.5) that have been domesticated by the domestication method of Example 1, the reaction temperature is controlled at 30°C, and the stirring is started. After 7 days of reaction, the stirring is stopped, and the mixed liquid is precipitated and separated, and the obtained elect...

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Abstract

The invention belongs to the technical field of waste battery metal recovery treatment, and relates to a method for recycling metal in a lithium ion battery through inorganic acid leaching-bioleachingcollaboration. The method includes the steps that (1) domestication of thiobacillus ferrooxidans is conducted; (2) battery disassembling is performed; (3) acid leaching is carried out, inorganic acidis thrown into mixed electrode material powder, a solution containing heavy metal and electrode powder is obtained, and the final pH of a reaction system is 1.8-2.5; and (4) bioleaching is performed,a culture solution is added into the solution, the domesticated thiobacillus ferrooxidans are further added, the mixed solution is precipitated and separated after reacting is completed, the mixed solution obtained through separation is centrifuged, and the centrifuged solution containing the heavy metal is subjected to heavy metal recovery. According to the method for recycling the metal in thelithium ion battery through inorganic acid leaching-bioleaching collaboration, inorganic acid leaching and bioleaching are combined, the using amount of acid is small, the metal leaching rate is high,the advantage of being moderate in bioleaching reaction condition is given into play, and environmental protection and safety are achieved.

Description

technical field [0001] The invention belongs to the technical field of waste battery metal recovery and treatment, and in particular relates to a method for synergistic recovery of metals in lithium ion batteries by inorganic acid leaching and bioleaching. Background technique [0002] With the development of science and technology, lithium-ion batteries are used more and more widely. At present, electronic products such as mobile phones and computers use lithium-ion batteries as energy storage units. However, the increasing amount of lithium-ion batteries scrapped has caused serious pollution to the environment. [0003] Waste lithium-ion batteries are important secondary resources of non-ferrous metals. Waste lithium-ion batteries contain 5-15%, 2-7%, and 0.5-2% cobalt, lithium, and nickel, respectively, as well as metals such as Cu, Al, and Fe. element. In particular, my country's cobalt resources are extremely scarce, and the mass fraction of cobalt in lithium-ion batte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/18C22B15/00C22B19/30C22B19/20C22B23/00
CPCC22B3/18C22B7/007C22B15/0071C22B19/22C22B19/30C22B23/043Y02P10/20
Inventor 程洁红张颢竞
Owner JIANGSU UNIV OF TECH
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