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Leaching system and method for recovering valuable metals from waste lithium cobaltate batteries

A technology of valuable metals and lithium cobaltate, applied in battery recycling, recycling technology, recycling by waste collectors, etc., can solve problems such as environmental secondary pollution, a large amount of acid waste gas and acid waste liquid, and achieve low equipment cost, Simple equipment, mild effect

Inactive Publication Date: 2020-05-01
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using acid leaching, the leaching process will produce a large amount of acid waste gas and acid waste liquid, etc., causing secondary pollution to the environment

Method used

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  • Leaching system and method for recovering valuable metals from waste lithium cobaltate batteries
  • Leaching system and method for recovering valuable metals from waste lithium cobaltate batteries
  • Leaching system and method for recovering valuable metals from waste lithium cobaltate batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A kind of leaching method that reclaims the valuable metal of waste lithium cobalt oxide battery comprises the following steps:

[0031] (1) After dismantling and crushing of waste lithium cobalt oxide batteries, the positive electrode material powder is separated. The positive electrode powder contains 7.39% Li and 60.23% Co, mainly in the form of lithium cobalt oxide (see figure 1 );

[0032] (2) Prepare a leaching system for recovering valuable metals from waste lithium cobaltate batteries, that is, a mixed aqueous solution of ammonia-sodium sulfite-ammonium chloride, in which the concentration of ammonia is 4mol / L, the concentration of sodium sulfite is 0.5mol / L, and the concentration of ammonium chloride The concentration is 1.5mol / L;

[0033] (3) Take 300mL of the leaching system of step (2) and add it to a 500mL three-neck flask, install a condensation device, then heat to 80°C, add 3g of the positive electrode powder obtained in step (1), and carry out the lea...

Embodiment 2

[0036] A kind of leaching method that reclaims the valuable metal of waste lithium cobalt oxide battery comprises the following steps:

[0037] (1) After dismantling and crushing of waste lithium cobalt oxide batteries, the positive electrode material powder is separated;

[0038] (2) Prepare a leaching system for recovering valuable metals from waste lithium cobaltate batteries with different ammonia concentrations, that is, a mixed aqueous solution of ammonia-sodium sulfite-ammonium chloride, where the ammonia concentrations are 0, 1, 2, 3, 4 and 5mol respectively / L, the concentration of sodium sulfite is 0.5mol / L, and the concentration of ammonium chloride is 1.5mol / L.

[0039] (3) Take 300mL of leaching systems with different ammonia concentrations in step (2) and add them to a 500mL three-neck flask, install a condensation device, then heat to 80°C, add 3g of the positive electrode powder obtained in step (1) respectively, and stir at 500rpm magnetic force , carry out t...

Embodiment 3

[0042] A kind of leaching method that reclaims the valuable metal of waste lithium cobalt oxide battery comprises the following steps:

[0043] (1) After dismantling and crushing of waste lithium cobalt oxide batteries, separate the cathode material powder;

[0044] (2) Prepare a leaching system for recovering valuable metals from waste lithium cobaltate batteries with different concentrations of sodium sulfite, that is, a mixed aqueous solution of ammonia-sodium sulfite-ammonium chloride, in which the concentration of ammonia is 4mol / L, and the concentration of sodium sulfite is 0 and 0.1 respectively , 0.2, 0.4, 0.5, 1.0, 2.0, 3.0mol / L, the concentration of ammonium chloride is 1.5mol / L.

[0045] (3) Take 300mL of the leaching system with different concentrations of sulfurous acid in step (2) and add them to a 500mL three-neck flask, install a condensation device, then heat to 80°C, add 3g of the positive electrode powder obtained in step (1) respectively. Under stirring, c...

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Abstract

The invention discloses a leaching system and method for recovering valuable metals from waste lithium cobaltate batteries. The leaching system is a mixed water solution prepared from ammonia, sodiumsulfite and ammonium chloride. The leaching method comprises the following steps that (1) the waste lithium cobaltate batteries are discharged, broken and separated to obtain positive pole powder; and(2) the leaching system is heated, then the positive pole powder is added into the leaching system, under a stirring condition, a leaching reaction is conducted, and after the reaction is completed,leachate containing Li<+> and Co(NH3)n<2+> is obtained. According to the leaching system, acid liquor does not need to be used, thus no harmful gas is generated, one-step leaching is conducted under the normal pressure, environmental protection is achieved, and secondary pollution is avoided; and the leaching method is safe, controllable and low in cost, and has industrial application prospects.

Description

technical field [0001] The invention relates to the field of waste battery resource recovery, in particular to a leaching system and a leaching method for recovering valuable metals from waste lithium cobalt oxide batteries. Background technique [0002] Lithium-ion batteries are widely used in portable devices and electric vehicles due to their excellent characteristics such as high working voltage, high theoretical specific capacity, no memory effect, and light weight. As a result, the amount of scrapped lithium-ion batteries has also continued to increase significantly. It is predicted that by 2020, the amount of scrapped lithium-ion batteries in my country will reach 500,000 tons. [0003] Lithium cobalt oxide is the first and most successful commercial lithium-ion battery cathode material product used in portable electronic devices. Therefore, the number of used spent lithium cobalt oxide batteries is also the largest. Waste lithium cobalt oxide batteries contain lit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B23/00C22B26/12H01M10/54
CPCC22B7/008C22B23/0446C22B26/12H01M10/54Y02P10/20Y02W30/84
Inventor 张佳峰李东民李鹏飞欧星张宝
Owner CENT SOUTH UNIV
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