{
  "$type": "site.standard.document",
  "description": "The present invention provides a method including the following three steps: (1) A leaching step of 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; (2) A rare earth…",
  "path": "/patents/990378",
  "publishedAt": "2013-05-29T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "C22B23/043",
    "SUMITOMO METAL MINING CO [JP]"
  ],
  "textContent": "The present invention provides a method including the following three steps: (1) A leaching step of 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; (2) A rare earth crystallization step of 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 (3) A sulfide raw material recovery step of adding a sulfurizing agent to the rare-earth-element-free solution to separate a nickel and cobalt sulfide raw material and a residual solution, wherein a sulfide containing nickel and cobalt and a sulfate containing rare earth elements are obtained, whereby nickel, cobalt and rare earth elements are separated from a material containing positive and negative electrode active materials which constitutes a nickel-metal hydride battery.",
  "title": "METHOD FOR SEPARATING NIKEL AND COBALT FROM ACTIVE MATERIALS CONTAINED IN SPENT NICKEL-HYDROGEN BATTERY"
}