Extraction of trace metals from fly ash

Details Extraction of trace metals from fly ash Extraction of trace metals from fly ash

1983-08-15

1984-10-09

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

204 64R, 204 66, 204 71, 75 25, 75 28, 75 62, 75 63, 75 66, 75 71, 75 72, 75 77, 75 78, 75 80, 75 83, C25C 106, C25C 112, C25C 116, C25C 118

Patent

active

044759932

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.

REFERENCES:
patent: 3291597 (1966-12-01), Mellgren et al.
patent: 3802870 (1974-04-01), Bell

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