Extraction of trace metals from fly ash

Patent · Tue Oct 09 04:00:00 EDT 1984

OSTI ID:5838642

Blander, M; Nagy, Z; Wai, Ch M

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.

• Assignee: The United States of America as represented by the United States Department of Energy
• Patent Number(s): US 4475993
• OSTI ID: 5838642
• Country of Publication: United States
• Language: English

Related Subjects

500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AEROSOL WASTES
ALUMINIUM CHLORIDES
ALUMINIUM COMPOUNDS
ASHES
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CRYSTAL STRUCTURE
DEMETALLIZATION
DEPOSITS
ELECTROLYSIS
ELEMENTS
FLY ASH
GALLIUM
GRAIN SIZE
HALIDES
HALOGEN COMPOUNDS
LYSIS
MANAGEMENT
MATERIALS RECOVERY
MELTING
METALS
MICROSTRUCTURE
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PROCESSING
RECOVERY
RESIDUES
SEPARATION PROCESSES
SILICATES
SILICON COMPOUNDS
SILVER
SIZE
TRACE AMOUNTS
TRANSITION ELEMENTS
WASTE MANAGEMENT
WASTE PROCESSING
WASTES