公开(公告)号：US20210210806A1

公开(公告)日：2021-07-08

申请号：US16733525

申请日：2020-01-03

Applicant: DOWA ECO-SYSTEM CO., LTD.

Inventor： Chihiro NISHIKAWA ,  Yoshihiro HONMA ,  Norio NAKAJIMA

IPC: H01M10/54 ,  H01M10/0525 ,  H01M4/66 ,  H01M4/587 ,  H01M2/02 ,  B03C1/28 ,  B03C1/10 ,  B02C23/10 ,  B02C23/20

Abstract: There is provided a means capable of recovering a valuable material such as cobalt and nickel, with a low grade of a metal derived from a negative electrode current collector, a low grade of fluorine, and a low grade of a material derived from a negative electrode active material. A method for recovering a valuable material from a lithium ion secondary battery, is characterized in that it includes: a heat treatment step of performing heat treatment on a lithium ion secondary battery; a crushing step of crushing a heat-treated object obtained through the heat treatment step; a classification step of classifying a crushed object obtained through the crushing step into a coarse particle product and a fine particle product; and a wet magnetic separation step of performing wet magnetic separation on the fine particle product obtained through the classification step.

公开(公告)号：US20210210807A1

公开(公告)日：2021-07-08

申请号：US16733537

申请日：2020-01-03

Applicant: DOWA ECO-SYSTEM CO., LTD.

Inventor： Chihiro NISHIKAWA ,  Yoshihiro HONMA ,  Norio NAKAJIMA

IPC: H01M10/54 ,  H01M10/0525 ,  H01M2/02 ,  H01M4/587 ,  H01M4/66 ,  B03C1/30 ,  B02C23/10

Abstract: A method for recovering a valuable material from a lithium ion secondary battery includes: a heat treatment step of performing heat treatment on a lithium ion secondary battery; a crushing step of crushing a heat-treated object obtained through the heat treatment step; a first stage of classification step of classifying a crushed object obtained through the crushing step based on a classification point of 1.2 to 2.4 mm, and a second stage of classification step of classifying an intermediate product and a fine particle product obtained on a fine side in the first stage of classification step based on a classification point of 0.3 mm or less; and a dry magnetic separation step of repeating one time or more a step of performing dry magnetic separation on an intermediate product obtained on a coarse side in the second stage of classification step and performing dry magnetic separation again.