{
  "$type": "site.standard.document",
  "coverImage": {
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  "description": "The objective of the present invention is to selectively extract light rare earth metals, and by extension, europium, from an acidic solution containing a plurality of types of rare earth metal. This valuable metal extraction agent is represented by the general formula. In the formula: R 1 and R 2…",
  "path": "/patents/980221",
  "publishedAt": "2014-01-01T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "C01F17/17",
    "UNIV KYUSHU NAT UNIV CORP [JP]"
  ],
  "textContent": "The objective of the present invention is to selectively extract light rare earth metals, and by extension, europium, from an acidic solution containing a plurality of types of rare earth metal. This valuable metal extraction agent is represented by the general formula. In the formula: R 1 and R 2 each indicate the same or different alkyl group; R 3 indicates a hydrogen atom or an alkyl group; and R 4 indicates a hydrogen atom or any given group other than an amino group bonded to the ± carbon as an amino acid. Preferably, the general formula has a glycine unit, a histidine unit, a lysine unit, an aspartic acid unit, or an N-methylglycine unit. Preferably, when extracting europium using the extraction agent, the pH is adjusted into the range of 2.0-3.0 inclusive, and when selectively extracting light rare earth metals, the pH is adjusted to 1.7-2.7 inclusive.",
  "title": "VALUABLE METAL EXTRACTION AGENT AND VALUABLE METAL EXTRACTION METHOD USING SAID EXTRACTION AGENT"
}