Method for separating Co (cobalt) and Li (lithium) from LiCoO2 (lithium cobalt oxide) of waste lithium batteries to prepare cobaltous phosphate

A technology for waste lithium batteries and lithium cobalt oxide, applied in chemical instruments and methods, solid waste removal, phosphorus compounds, etc., can solve problems such as low recovery efficiency, secondary pollution, and complicated recovery process, and achieve separation and recovery High efficiency, small liquid-solid ratio, and solve the effect of complex recovery process

Active Publication Date: 2017-02-15
CENT SOUTH UNIV
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Problems solved by technology

[0003] Waste lithium-ion batteries contain a variety of non-ferrous metals (such as cobalt and lithium) with high recovery value, but the current recovery methods and processes for typical waste lithium batteries mainly include pyrometallurgy, hydrometallurgy and bioleaching processes. The method and process have obvious defects such as complex recovery process, easy to produce secondary pollution, and low recovery efficiency.

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  • Method for separating Co (cobalt) and Li (lithium) from LiCoO2 (lithium cobalt oxide) of waste lithium batteries to prepare cobaltous phosphate
  • Method for separating Co (cobalt) and Li (lithium) from LiCoO2 (lithium cobalt oxide) of waste lithium batteries to prepare cobaltous phosphate

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Embodiment 1

[0028] (1) Take about 5kg of typical waste lithium batteries (the positive electrode active material is LiCoO 2 ) for disassembly and pretreatment, and the metal case, separator, current collector pole piece (Al foil and Cu foil), positive and negative active material powder mixture and other components can be obtained respectively. Then the obtained 2.17kg positive and negative electrode active material powder (the main component is LiCoO 2 and C) calcined in a muffle furnace at 700 °C for 2 h, fully ground in a ball mill and passed through a 200-mesh sieve to obtain 1.38 kg of fine-grained waste LiCoO 2 powder.

[0029] (2) Then each time accurately weigh the LiCoO of the fine particles obtained above 2 About 5 grams of powder were placed in a 250mL three-necked flask; corresponding orthogonal experiments were designed (L16(4 5 ), a total of 16 experiments: No.1~No.16), under the experimental conditions of controlling the reaction temperature at 40~80℃, the stirring rate ...

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Abstract

The invention discloses a method for separating Co (cobalt) and Li (lithium) from LiCoO2 (lithium cobalt oxide) of waste lithium batteries to prepare cobaltous phosphate. The method comprises the following steps: (1) disassembling and peeling the waste lithium batteries to obtain anode and cathode active substances; (2) calcining and grinding the anode and cathode active substances to obtain LiCoO2-containing powder materials; (3) performing leaching on the LiCoO2-containing powder materials by mixed leaching liquid of H3PO4 and H2O2; neutralizing the obtained leaching liquid; performing solid-liquid separation to obtain cobaltous phosphate sediment and a lithium-containing solution. The method has the advantages that the LiCoO2 of typical waste lithium batteries is used as a raw material; the Co and the Li are effectively separated by a roasting and leaching method; the cobalt with high additional values is recovered for preparing the cobaltous phosphate (cobalt violet); the resource recycling and utilization of the LiCoO2 of the waste lithium batteries are realized.

Description

technical field [0001] The invention relates to a method for recovering valuable metals from waste lithium batteries, in particular to a method for separating and recovering Co and Li in positive active materials by hydrometallurgy, and belongs to the field of recovery of valuable metals from waste batteries. Background technique [0002] Lithium-ion batteries have many excellent electrochemical properties and are widely used in portable mobile devices such as mobile phones and notebook computers and electric / hybrid vehicles. According to statistics, the global production of lithium-ion batteries in 2010 was close to 2 billion; it is expected that the output will exceed 5 billion in 2020; the life of common lithium-ion batteries is about 2 to 3 years, and the analysis results of its composition show that: the average battery life of each battery is Contains: about 15% cobalt, about 1.5% lithium, about 18% copper, about 5% aluminum. With the end of life of these lithium batt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/37B09B3/00
CPCC01B25/37C01P2002/72C01P2002/80B09B3/80B09B3/40
Inventor 周涛陈湘萍孙琮浩徐莉萍
Owner CENT SOUTH UNIV
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