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Method for recovering lithium

A technology for recovering lithium and spodumene, applied in the field of lithium recovery

Active Publication Date: 2021-06-25
UMICORE AG & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] From this point of view, the separation of lithium from slags containing aluminum and lithium is problematic because both aluminum and lithium are leached during acid treatment and are prone to co-precipitation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 4

[0051] Example 4 demonstrates that the reduction in the amount of aluminum in the leach solution further limits the loss of lithium when the solution is purified. To date, the amount of slag used in the neutralization step is reduced and supplemented by another neutralizing agent such as lime.

[0052] The same acid solution and ground slag as in Example 3 were prepared. However, the solution was neutralized to a pH of 0.5 instead of 2.5 using slag. The amount of slag was about half of that required in Example 3.

[0053] After being neutralized to a pH of 0.5 using slag, the pH of the slurry was further raised to 5.5 using lime to purify the slurry by precipitating dissolved aluminum. The slurry was filtered and washed, and the filtrate and residue were analyzed for lithium and aluminum. The filtrate contained 1 mg / L Al, indicating that almost all of the aluminum had precipitated. The residue was found to contain 0.3% Li.

[0054] Thereby, aluminum is completely removed ...

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PUM

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Abstract

The present invention discloses a method for recovering lithium from smelting slag, the method comprising the steps of: roasting spodumene to convert it from an alpha modification to a beta modification; reacting the variant with sulfuric acid; repulping the reaction product with water to form an acidic slurry; neutralizing the acidic slurry to a pH between 5 and 7 by adding at least one neutralizing agent; filtering the neutralized slurry, Lithium-containing solutions and residues are thereby obtained; the method is characterized in that lithium-containing smelting slag is added as a neutralizing agent in one or both of the steps of repulping and neutralizing the acidic slurry. The lithium-containing smelting slag is used to replace at least some of typical neutralizing agents. Lithium from the slag is liberated and added to the lithium evolved from the spodumene.

Description

technical field [0001] The present invention relates to an improved method for recovering lithium from lithium-containing slag. Background technique [0002] This slag is obtained when the pyro-smelting process is used to recycle lithium-ion batteries or their derived products. The cells are fused together at high temperature with a slagging flux comprising one or more of oxides of silicon, calcium, aluminum, magnesium, iron and manganese. The oxygen potential is selected such that a cobalt-nickel-copper metal phase and slag are formed. Elements that are more easily oxidized (second to lithium) enter the slag. The organic fraction in the cell is efficiently pyrolyzed and the residual volatiles are captured in the exhaust gas cleaning system. [0003] Methods of recovering lithium from such slags have been investigated, but these methods remain complex and expensive. According to known methods, the slag is leached under acidic conditions. A leach solution containing a ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B26/12C22B7/04
CPCC22B7/006C22B7/04C22B26/12Y02P10/20Y02W30/84
Inventor 哈拉尔德·奥斯特胡夫大卫·杜邦
Owner UMICORE AG & CO KG
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