Extraction of trace metals from fly ash
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United States of America Patent
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Oct 9, 1984
Grant Date -
N/A
app pub date -
Aug 15, 1983
filing date -
Aug 15, 1983
priority date (Note) -
Expired
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Abstract
A process for recovering silver, gallium and/or other trace metals from a fine grained industrial fly ash associated with a process for producing phosphorous, the fly ash having a silicate base and containing surface deposits of the trace metals as oxides, chlorides or the like, with the process being carried out by contacting the fly ash with AlCl.sub.3 in an alkali halide melt to react the trace metals with the AlCl.sub.3 to form compositions soluble in the melt and a residue containing the silicate and aluminum oxide or other aluminum precipitate, and separating the desired trace metal or metals from the melt by electrolysis or other separation techniques.
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