Lithium recycling method in lithium-containing waste

A technology of waste and content, applied in recycling technology, recycling of waste collectors, battery recycling, etc., can solve problems such as hardening, achieve the effects of lowering reaction temperature, good thermal conductivity, and eliminating hardening

Active Publication Date: 2020-12-25
柯芬
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this scheme also has at least the following defects: serious hardening phenomenon is prone to occur in the reaction process

Method used

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  • Lithium recycling method in lithium-containing waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The recycling method of lithium in this lithium-containing waste material comprises the following steps:

[0024] A. Mix the lithium-containing waste material with graphite, so that the lithium-containing waste material is doped with a certain proportion of graphite;

[0025] B. the mixed waste obtained in step A is reacted with an acidic substance;

[0026] C. heat-treating the product obtained in step B to generate insoluble oxides and soluble lithium salts.

[0027] D. Leaching and solid-liquid separation of the product obtained in step C through an aqueous solution to obtain a lithium-rich solution and residue.

[0028] F. Add soluble salt or / and soluble base to the lithium-enriched solution obtained in step D, and filter to obtain lithium salt precipitation or directly obtain lithium salt crystals by evaporation or freezing. Acidic substances undergo a displacement reaction with mixed waste

[0029] LiCoO2+H+=HCoO2+Li+

[0030] Li2CO3+2H+=H2CO3+2Li+

[0031] I...

Embodiment 2

[0044] The only difference between this example and Example 1 is that the graphite content reaches 20%, and concentrated sulfuric acid is added according to the molar ratio of H / Li=1.3 (when H / Li=1.2, the lithium leaching rate is only 96%), and the reaction system is mixed. The temperature rises sharply, up to 117°C, and the material agglomerates. In order to make the reaction system uniform, it needs to be ball milled to 200 mesh, and it takes at least 8 hours to grind the material to 200 mesh.

[0045] Then carry out roasting treatment, the roasting temperature is set to 500 degrees, it needs roasting for at least 2.4 hours to make the lithium leaching rate above 99%, after the roasting is completed, the material has agglomerated, the measured hardness is 2, and the time required for ball milling to 200 mesh for 8h. Leaching with water, by detecting the transition metal content of the leaching solution, 4.2% of the transition metal was dissolved.

Embodiment 3

[0047]The only difference between this example and Example 1 is that the graphite content reaches 30%, and concentrated sulfuric acid is added according to the molar ratio of H / Li=1.1 (when H / Li=1.08, the lithium leaching rate is only 96%), and the reaction system is mixed. The temperature rises sharply, up to 90°C, and the material agglomerates. In order to make the reaction system uniform, it needs to be ball milled to 200 mesh, and it takes at least 2 hours to grind the material to 200 mesh.

[0048] Then carry out roasting treatment, the roasting temperature is set to 500 degrees, it needs roasting for at least 2.2 hours to make the leaching rate of lithium more than 99%, after the roasting is completed, the material has agglomerated, the measured hardness is 1.5, and the time required for ball milling to 200 mesh for 2h. Leaching with water, by detecting the transition metal content of the leach solution, 1.2% of the transition metal was dissolved.

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Abstract

The invention belongs to the technical field of lithium battery recycling, and relates to a method for recycling lithium in lithium-containing waste. The method solves the technical problems that in the prior art, a serious hardening phenomenon is prone to occurring to a reaction process and the like. According to the following technical scheme, the method comprises the steps that A, the lithium-containing waste is mixed with graphite to enable the lithium-containing waste to be doped with a certain proportion of graphite; B, mixed waste obtained in the step A is reacted with an acidic material; C, a product obtained in the step B is subjected to heat treatment to produce insoluble oxides and a soluble lithium salt; D, a product obtained in the step C is subjected to leaching and solid-liquid separation through an aqueous solution to obtain a lithium-rich solution and residues; and E, the lithium-rich solution obtained in the step D is added with a soluble salt or / and a soluble base and filtered to obtain lithium salt precipitation or directly obtain a lithium salt crystal by evaporation or freezing. Compared with the prior art, the method has the advantages of well relieving the hardening phenomenon in the reaction process.

Description

technical field [0001] The invention belongs to the technical field of lithium battery recovery, and relates to a method for recycling lithium in lithium-containing waste materials. Background technique [0002] Since its birth, lithium-ion batteries have been widely used in mobile electronic products such as mobile phones, notebooks, and charging treasures because of their high energy density and fast charging and discharging characteristics. Especially with the rise of new energy vehicles, the development of lithium-ion batteries Development has been greatly advanced. The lifespan of lithium-ion batteries is generally 3-5 years. With the large-scale use of lithium-ion batteries in the digital field and the field of new energy vehicles, a large number of used lithium-ion batteries are bound to be scrapped. Scrapped lithium-ion batteries contain organic substances, fluorides and heavy metals that are harmful to the environment and human body. If they are not properly treate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B1/02C22B26/12C22B23/00C22B47/00C01G51/10C01G53/10C01G45/10C01D15/08C01D15/06C01D15/00H01M10/54
CPCY02W30/84Y02P10/20Y02P20/129
Inventor 柯芬
Owner 柯芬
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