Extraction of trace metals from fly ash

Patent · Sun Jan 01 04:00:00 EST 1984

OSTI ID:865182

Blander, Milton ^[1]; Wai, Chien M ^[2]; Nagy, Zoltan ^[3]

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1. Palos Park, IL
2. Moscow, ID
3. Woodridge, IL

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.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL
• DOE Contract Number: W-31109-ENG-38
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4475993
• OSTI ID: 865182
• Country of Publication: United States
• Language: English

Related Subjects

/205/75/
alcl
alkali
alkali halide
aluminum
aluminum oxide
ash
associated
base
carried
chlorides
compositions
contacting
containing
deposits
desired
electrolysis
extraction
fine
fine grain
fine grained
fly
fly ash
form
gallium
grained
halide
industrial
melt
metal
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oxide
oxides
phosphorous
precipitate
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react
recovering
residue
residue containing
separating
separation
separation technique
separation techniques
silicate
silver
soluble
surface
surface deposit
techniques
trace
trace metal
trace metals