发明名称 |
Method for separating nickel and cobalt from active material contained in spent nickel-metal hydride battery |
摘要 |
A method for separating nickel, cobalt and a rare earth element from a material containing positive and negative electrode active materials of a nickel-metal hydride battery includes mixing a material containing positive and negative electrode active materials with a sulfuric acid solution and dissolving therein, and then separating a leachate from a residue; adding an alkali metal sulfate to the leachate to obtain a mixed precipitate of double sulfate of rare earth elements, and a rare-earth-element-free solution; and adding a sulfurizing agent to the rare-earth-element-free solution to separate a nickel and cobalt sulfide raw material and a residual solution. |
申请公布号 |
US8888892(B2) |
申请公布日期 |
2014.11.18 |
申请号 |
US201013809302 |
申请日期 |
2010.11.16 |
申请人 |
Sumitomo Metal Mining Co., Ltd. |
发明人 |
Kikuta Naoko;Asano Satoshi;Takano Masatoshi |
分类号 |
C22B7/00;C22B23/00;C22B59/00;C22B3/44;C22B3/00;H01M10/54 |
主分类号 |
C22B7/00 |
代理机构 |
|
代理人 |
Hespos Gerald E.;Porco Michael J.;Hespos Matthew T. |
主权项 |
1. A method for separating nickel, cobalt, and a rare earth element from a material containing positive and negative electrode active materials of a nickel-metal hydride battery, wherein a sulfide containing nickel and cobalt and a sulfate containing a rare earth element are obtained from the material containing positive and negative electrode active materials which constitutes the nickel-metal hydride battery, the method comprising:
(1) a leaching step of mixing the material containing positive and negative electrode active materials with a sulfuric acid solution and dissolving therein, followed by separating a leachate from a residue, (2) a rare earth crystallization step of adding an alkali metal sulfate to the leachate obtained in the leaching step and thereby obtaining a mixed precipitate of double sulfate of a rare earth element and a rare-earth-element-free solution, and (3) a sulfide raw material recovery step of adding a sulfurizing agent to the rare-earth-element-free solution obtained in the rare earth crystallization step and thereby separating a nickel and cobalt sulfide raw material from a residual solution, and (4) a dezincification step of adding a sulfurizing agent to the rare-earth-element-free solution obtained in the rare earth crystallization step to separate zinc in the rare-earth-element-free solution as a sulfide precipitate, and supplying a residual solution after the separation as the rare-earth-element-free solution in the sulfide raw material recovery step. |
地址 |
Tokyo JP |