Novel process for simultaneously recovering valuable metals and iron from mixed waste lithium ion batteries

A lithium-ion battery, hybrid technology, applied in battery recycling, waste collector recycling, recycling technology, etc., can solve problems such as increased treatment costs and ammonia nitrogen pollution

Active Publication Date: 2019-12-20
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the leaching of ammonia system will cause ammonia nitrogen pollution and increase the cost of follow-up treatment

Method used

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  • Novel process for simultaneously recovering valuable metals and iron from mixed waste lithium ion batteries
  • Novel process for simultaneously recovering valuable metals and iron from mixed waste lithium ion batteries

Examples

Experimental program
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Effect test

Embodiment 1

[0022] For a novel process for the simultaneous recovery of valuable metals and iron from hybrid spent lithium-ion batteries, the steps are as follows:

[0023] Take 1kg of waste lithium battery and carry out pretreatment procedures such as discharging, dismantling, and stripping to obtain 420g of positive electrode materials, wherein the detailed percentages of Co, Li, Mn, Ni and Fe are: 17.2%, 5.4%, 16.1%, 6.5% and 8.6%.

[0024] The positive electrode material is leached, the leaching temperature is 40°C, the leaching time is 40min, the liquid-solid ratio is 30mL / g, the acid concentration is 2mol / L, and the reducing agent dosage is 4%. After leaching, filter to obtain Co, Li, Mn, Ni mixed solution and iron compound residue. Adjust the content of metal ions in the leaching solution, then precipitate the metal ions, reuse the acid, then calcinate the precipitate at 600°C, and obtain synthetic LiNi after grinding 1 / 3 co 1 / 3 mn 1 / 3 o 2 Material. Lithium source is added to...

Embodiment 2

[0026] For a novel process for the simultaneous recovery of valuable metals and iron from hybrid spent lithium-ion batteries, the steps are as follows:

[0027] Take 3kg of waste lithium batteries, carry out pretreatment procedures such as discharging, dismantling, and stripping, and obtain 1.26kg of positive electrode materials, of which the detailed percentages of Co, Li, Mn, Ni and Fe are: 17.2%, 5.4%, 16.1%, 6.5% and 8.6%.

[0028] The positive electrode material is leached, the leaching temperature is 50° C., the time is 80 min, the liquid-solid ratio is 30 mL / g, the acid concentration is 1 mol / L, and the amount of reducing agent is 2%. After leaching, filter to obtain Co, Li, Mn, Ni mixed solution and iron compound residue. Adjust the content of metal ions in the leaching solution, then precipitate the metal ions, reuse the acid, then calcinate the precipitate at 900°C, and obtain synthetic LiNi after grinding 1 / 3 co 1 / 3 mn 1 / 3 o 2 Material. FePO obtained after lea...

Embodiment 3

[0030] For a novel process for the simultaneous recovery of valuable metals and iron from hybrid spent lithium-ion batteries, the steps are as follows:

[0031] Take 0.5kg of waste lithium battery, carry out pretreatment procedures such as discharging, dismantling, and stripping, and obtain 210g of positive electrode materials, of which the detailed percentages of Co, Li, Mn, Ni and Fe are: 17.2%, 5.4%, 16.1%, 6.5% and 8.6%.

[0032] The positive electrode material is leached, the leaching temperature is 80°C, the leaching time is 50min, the liquid-solid ratio is 30mL / g, the acid concentration is 6mol / L, and the reducing agent dosage is 8%. After leaching, filter to obtain Co, Li, Mn, Ni mixed solution and iron compound residue. Adjust the content of metal ions in the leaching solution, then precipitate the metal ions, reuse the acid, then calcinate the precipitate at 800°C, and obtain synthetic LiNi after grinding 1 / 3 co 1 / 3 mn 1 / 3 o 2 Material. Lithium source is added ...

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Abstract

The invention discloses a novel process for simultaneously recovering valuable metals and iron from mixed waste lithium ion batteries. The novel process comprises the following step that S1, preprocessing is carried out, namely, the waste lithium batteries are subjected to pre-treatment procedures such as discharging, disassembling, stripping and the like; S2, leach is carried out, namely, the obtained waste lithium ion battery cathode materials are leached out after stripping to obtain a leaching solution containing Mn <2+>, Ni <2+>, Co <2+>, Li <+>, and the main metal in the leaching residueis iron; S3, the metal ion proportion in the leaching solution is adjusted, then the metal ions are subjected to precipitating, grinding and calcining to obtain LiNi1 / 3CO1 / 3Mn1 / 3O2 materials; and S4, after the FePO4 residue obtained in the step S2 is added to a lithium source to prepare LiFePO4 materials. The novel process has the advantages of high selectivity, wide application range and high recovery rate.

Description

technical field [0001] The invention relates to the technical field of waste lithium batteries, in particular to a novel process for simultaneously recovering valuable metals and iron from mixed waste lithium ion batteries. Background technique [0002] In recent years, with the increasing output of mobile devices such as electronic equipment and vehicles, the demand for lithium batteries has also been increasing. However, the limited service life of lithium-ion batteries has led to a sharp increase in the number of discarded lithium batteries. my country is a country with a large population, and it is undoubtedly one of the main bodies of battery production and consumption in the world. According to statistics, due to the development of the electric vehicle industry, it is estimated that by 2020, the total amount of lithium-ion batteries discarded in the world will exceed 25 billion Only, the weight will reach 500,000 tons. [0003] Lithium-ion batteries contain cobalt, lit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B1/00C22B26/12C22B47/00C22B19/20C22B19/30H01M10/54
CPCC22B1/005C22B7/007C22B19/22C22B19/30C22B26/12C22B47/00H01M10/54Y02W30/84Y02P10/20
Inventor 陈湘萍李佳竺李静何志强何路凤
Owner SHAANXI UNIV OF SCI & TECH
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