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Method for processing ash, particularly fly ash

  • US 9,783,870 B2
  • Filed: 11/30/2012
  • Issued: 10/10/2017
  • Est. Priority Date: 12/02/2011
  • Status: Active Grant
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1. Method for processing ash, in which method several elements are separated from the ash, characterized in that the several elements include both noble metals and rare earth elements, the noble metals and the rare earth elements are separated from the ash in two extraction processes, wherein the noble metals are separated in the first extraction process and the rare earth elements are separated in the second extraction process, and solutions obtained in the extraction processes are precipitated in two steps, in the first step of which noble metals are precipitated and in the second step of which rare earth elements are precipitated.

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