METHOD FOR RECOVERING VALUABLE METALS

WIPO Patent Application WO/2024/062905

A1

Provided is a method capable of suppressing generation of dust during handling of a mixed powder of positive electrode active material and negative electrode active material, which is the raw material to be processed in the method for recovering valuable metals, and reducing recovery loss of valuable metals due to carry over that occurs when processing the mixed powder.　The present invention is a method for recovering valuable metals, wherein the method includes a preparation step S1 that prepares a raw material containing waste lithium-ion batteries, and a granulated material is prepared from a mixed powder in the preparation step S1 by implementing a preliminary kneading step S13 that adds water to a mixed powder containing the positive electrode active materials and the negative electrode active materials that constitute the waste lithium-ion batteries and preliminarily kneads the mixture and a granulation step S14 that further kneads and granulates the preliminarily kneaded material. The amount of water added in the preliminary kneading step S13 is preferably adjusted to 0.14-0.16 by weight ratio relative to the mixed powder. Also, a twin-shaft paddle granulator is preferably used in the granulation step S14, with the circumferential speed of the paddle tips set at 50-90 m/min.

NAGAKURA TOSHIHIKO (JP)
HAGIO TOMOYA (JP)

PCT/JP2023/032077

March 28, 2024

September 01, 2023

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SUMITOMO METAL MINING CO (JP)

C22B1/24; C22B5/02; C22B7/00; H01M10/54

JP2021188067A	2021-12-13
JP2021077657A	2021-05-20
JP2012201947A	2012-10-22

SHOBAYASHI Masayuki et al. (JP)

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