公开(公告)号：US20250115487A1

公开(公告)日：2025-04-10

申请号：US18729269

申请日：2023-01-13

Applicant: DOWA ECO-SYSTEM CO., LTD.

Inventor： Chihiro NISHIKAWA ,  Shota TAHATA ,  Ryoei WATANABE ,  Changzhi LIU ,  Shohei YOSHIDA

IPC: C01D15/08 ,  B01D9/00 ,  B01D61/42 ,  H01M10/54

Abstract: Provided is a method of recovering valuable materials that is a method of recovering lithium carbonate from a lithium-ion secondary battery, where the lithium carbonate has a boron content of less than 1 ppm and a calcium content of 100 ppm or less. The method includes a heat treatment step, a crushing and classification step, a slurry formation step, a wet magnetic separation step, an acid leaching step, a neutralization step, a neutralized cake solid-liquid separation step, a calcium carbonate crystallization step, a calcium carbonate solid-liquid separation step, and a calcium adsorption and removal step.

公开(公告)号：US20240243381A1

公开(公告)日：2024-07-18

申请号：US18561768

申请日：2022-03-01

Applicant: DOWA ECO-SYSTEM CO., LTD.

Inventor： Masataka YAMASHITA ,  Yoshihiro HONMA ,  Chihiro NISHIKAWA ,  Jiahao LIU ,  Shota TAHATA ,  Changzhi LIU

IPC: H01M10/54 ,  C22B1/02 ,  C22B7/00

CPC classification number: H01M10/54 ,  C22B1/02 ,  C22B7/005

Abstract: A method of separating valuable materials. The method includes a heat treatment step of performing a heat treatment on a lithium-ion secondary battery including valuable materials, a crushing step of crushing a heat-treated product obtained in the heat treatment step, and a classification step including a first classification step of classifying a crushed product obtained in the crushing step into a coarse-particle product and an intermediate product at a classification cut-point of 0.6 mm or greater and 2.4 mm or less, and a second classification step of classifying the intermediate product into a medium-particle product and a fine-particle product at a classification cut-point of 40 μm or greater and 300 μm or less.

公开(公告)号：US20230116994A1

公开(公告)日：2023-04-20

申请号：US17793515

申请日：2021-01-13

Applicant: DOWA ECO SYSTEM CO., LTD.

Inventor： Shota TAHATA ,  Hisashi SASAKI ,  Ryoei WATANABE

IPC: B09B3/35 ,  B07B4/00 ,  B02C23/20 ,  C22B7/00

Abstract: A metal recovery method includes crushing a photovoltaic module or a photovoltaic sheet-like structure to form debris; and sorting the debris, wherein the photovoltaic sheet-like structure is obtained by removing a glass substrate and a frame member from the photovoltaic module, and includes at least a photovoltaic cell, a metal pattern wired from the photovoltaic cell, and an encapsulant to encapsulate the photovoltaic cell and the metal pattern.