Clean process of recovering metals from waste lithium ion batteries
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United States of America Patent
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Feb 4, 2003
Grant Date -
N/A
app pub date -
Oct 30, 2001
filing date -
Aug 20, 2001
priority date (Note) -
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Abstract
A process of recovering metals from waste lithium ion batteries, wherein the waste batteries are calcined and sieved to generate an ash containing metals and metal oxides. The invented process includes subjecting the ash to a dissolution etching treatment, and a filtration treatment, and separately using a membrane electrolysis method to separate out metal copper and cobalt, wherein the acid generated on the cathode side in the electrolysis process can be recovered through a diffusion dialysis treatment. After electrolysis, the solution rich in lithium ion, after precipitating the metal impurities by adjusting the pH value, can be added with a carbonate ion to form a lithium carbonate.
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