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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
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.
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公开(公告)号：US20230411719A1
公开(公告)日：2023-12-21
申请号：US18025498
申请日：2021-09-07
Applicant: DOWA ECO-SYSTEM CO., LTD.
Inventor： Chihiro NISHIKAWA , Yoshihiro HONMA , Ryoei WATANABE , Masataka YAMASHITA
CPC classification number: H01M10/54 , C22B7/005 , C22B15/0004
Abstract: A method for recovering a valuable substance from a lithium ion secondary battery is provided. The method includes a thermal treatment step of thermally treating a lithium ion secondary battery containing aluminum, carbon, and a copper foil as constituting materials, and a wet sorting step of applying an external force to a thermally treated product obtained in the thermal treatment step in the presence of a liquid, to sort the thermally treated product into a heavy product and a light product containing copper.
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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
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.
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公开(公告)号：US20230318063A1
公开(公告)日：2023-10-05
申请号：US18024825
申请日：2021-09-03
Applicant: DOWA ECO-SYSTEM CO., LTD.
Inventor： Yoji SUGANUMA , Hiroki NAGAHARA , Minoru YOSHIHARA , Chihiro NISHIKAWA , Ryoei WATANABE , Yoshihiro HONMA , Masataka YAMASHITA
CPC classification number: H01M10/54 , C22B21/0092 , C22B7/005 , C22B15/0013 , B09B3/40
Abstract: A method for recovering a valuable substance is provided. The method includes: a thermal treatment step of thermally treating a target containing a valuable substance while supporting a target storing unit, in which the target is stored, by a supporting unit that can support the target storing unit, wherein the thermally treating includes heating a gas present in a region, in which the supporting unit is positioned, by a flame for thermally treating the target such that the target storing unit is not contacted by the flame; and a valuable substance recovering step of recovering the valuable substance from a thermally treated product of the target obtained in the thermal treatment step.
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公开(公告)号：US20230083016A1
公开(公告)日：2023-03-16
申请号：US17797548
申请日：2021-01-29
Applicant: DOWA ECO-SYSTEM CO., LTD.
Inventor： Tatsuya YODOSE , Ryoei WATANABE , Hitoshi SASAKI , Chihiro NISHIKAWA , Yoshihiro HONMA
Abstract: Provided is a sorting method for valuable resources, including a thermal treatment step of thermally treating a target containing valuable resources, to melt aluminum and separate a melt, a pulverizing step of pulverizing a thermally treated product remaining after the melt is separated, to obtain a pulverized product, a magnetic sorting step of sorting the valuable resources from the pulverized product by a magnetic force, and a wind force sorting step of sorting one valuable resource from another valuable resource in the valuable resources by a wind force.
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Patent Agency Ranking
公开(公告)号：US20220396852A1
公开(公告)日：2022-12-15
申请号：US17772041
申请日：2020-09-10
Applicant: DOWA ECO-SYSTEM CO., LTD.
Inventor： Chihiro NISHIKAWA , Yoshihiro HONMA , Ryoei WATANABE
Abstract: Provided is a method for separating lithium from a lithium solution containing lithium by 200 mg/L or more and fluorine by 20 mg/L or more, the method including: a first removal step of adding a first component, which solidifies the fluorine contained in the lithium solution, to the lithium solution and removing the fluorine solidified to obtain a F-removed liquid; and a second removal step of adding a second component, which solidifies the first component remaining in the F-removed liquid, to the F-removed liquid and removing the first component solidified to obtain a first component-removed liquid.
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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.
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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
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.
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公开(公告)号：US20230366061A1
公开(公告)日：2023-11-16
申请号：US18025490
申请日：2021-09-07
Applicant: DOWA ECO-SYSTEM CO., LTD.
Inventor： Chihiro NISHIKAWA , Yoshihiro HONMA , Ryoei WATANABE , Masataka YAMASHITA
CPC classification number: C22B15/0056 , H01M10/54 , C22B1/24 , C22B7/003
Abstract: A method for recovering a valuable substance is provided. The method includes a thermal treatment step of thermally treating a target containing a valuable substance using a continuous furnace configured to thermally treat the target while moving a target storing unit, in which the target is stored, such that the target storing unit is not contacted by a flame that is for thermal treatment, and a valuable substance recovering step of recovering the valuable substance from a thermally treated product of the target obtained in the thermal treatment step.
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公开(公告)号：US20230323506A1
公开(公告)日：2023-10-12
申请号：US18025485
申请日：2021-09-07
Applicant: DOWA ECO-SYSTEM CO., LTD.
Inventor： Chihiro NISHIKAWA , Yoshihiro HONMA , Ryoei WATANABE , Masataka YAMASHITA , Youichi FUKUCHI , Tomotaka IZUMI , Yoshiki ITO
CPC classification number: C22B9/22 , H01M10/54 , C22B15/0056 , C22B15/0095
Abstract: A method for recovering a valuable substance is provided. The method includes a thermal treatment step of thermally treating a target, which contains a valuable substance and is stored in a target storing unit, via a flame blocking unit configured to block a flame for thermally treating the target such that the target storing unit is not contacted by the flame, and a valuable substance recovering step of recovering the valuable substance from a thermally treated product of the target obtained in the thermal treatment step.
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