A method for preparing cobalt phosphate by separating cobalt lithium from waste lithium battery lithium cobaltate

A technology for waste lithium batteries and lithium cobalt oxide, applied in chemical instruments and methods, solid waste removal, phosphorus compounds, etc., can solve the problems of secondary pollution, complicated recycling process, low recycling efficiency, etc., and achieve separation and recycling High efficiency, solve the effect of complex recycling process and mild process conditions

Active Publication Date: 2018-06-29
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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  • A method for preparing cobalt phosphate by separating cobalt lithium from waste lithium battery lithium cobaltate
  • A method for preparing cobalt phosphate by separating cobalt lithium from waste lithium battery lithium cobaltate

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Embodiment 1

[0027] (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.

[0028] (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 preparing cobalt phosphate by separating cobalt lithium from lithium cobalt oxide in waste lithium batteries. The method comprises the following steps: 1) dismantling and stripping waste lithium batteries to obtain positive and negative active materials; 2) Calcining and grinding the positive and negative active materials to obtain a LiCoO2-containing powder material; 3) The LiCoO2-containing powder material is leached with a mixed leaching solution of H3PO4 and H2O2, and the obtained leaching solution is neutralized and solid-liquid separated , to obtain cobalt phosphate precipitate and lithium-containing solution. This method uses lithium cobalt oxide of typical waste lithium batteries as raw material, adopts roasting combined with leaching to effectively separate Co and Li, and recovers its high value-added cobalt to prepare cobalt phosphate (cobalt violet), realizing the recycling of lithium cobalt oxide in waste lithium batteries and exploit.

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 Patents(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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