Recovery of aluminum and other metal values from fly ash

McDowell, William J; Seeley, Forest G

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Title: Recovery of aluminum and other metal values from fly ash

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Abstract

The invention described herein relates to a method for improving the acid leachability of aluminum and other metal values found in fly ash which comprises sintering the fly ash, prior to acid leaching, with a calcium sulfate-containing composition at a temperature at which the calcium sulfate is retained in said composition during sintering and for a time sufficient to quantitatively convert the aluminum in said fly ash into an acid-leachable form.

Inventors:

McDowell, William J ^[1]; Seeley, Forest G ^[1]

Oak Ridge, TN

Issue Date:: Thu Jan 01 00:00:00 EST 1981

Research Org.:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

OSTI Identifier:: 863810

Patent Number(s):: 4252777

Assignee:: United States of America as represented by United States (Washington, DC)

Patent Classifications (CPCs):: C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01F - COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS

C - CHEMISTRY C22 - METALLURGY C22B - PRODUCTION AND REFINING OF METALS

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C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01F - COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
C01F7/26 - with sulfuric acids or sulfates
C01F7/74 - Sulfates
C01F7/741 - {Preparation from elemental aluminium or elemental aluminium containing materials, e.g. foil, dross}

C - CHEMISTRY C22 - METALLURGY C22B - PRODUCTION AND REFINING OF METALS
C22B21/0007 - {Preliminary treatment of ores or scrap or any other metal source

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DOE Contract Number:: W-7405-ENG-26

Resource Type:: Patent

Country of Publication:: United States

Language:: English

Subject:: recovery; aluminum; metal; values; fly; ash; described; relates; method; improving; acid; leachability; found; comprises; sintering; prior; leaching; calcium; sulfate-containing; composition; temperature; sulfate; retained; time; sufficient; quantitatively; convert; acid-leachable; form; metal values; time sufficient; fly ash; calcium sulfate; comprises sintering; values found; /423/

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                    McDowell, William J, and Seeley, Forest G. Recovery of aluminum and other metal values from fly ash.  United States: N. p., 1981. 
        Web.

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                    McDowell, William J, & Seeley, Forest G. Recovery of aluminum and other metal values from fly ash.  United States.

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                    McDowell, William J, and Seeley, Forest G. Thu .  
        "Recovery of aluminum and other metal values from fly ash".  United States.  https://www.osti.gov/servlets/purl/863810.

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@article{osti_863810,

  title        = {Recovery of aluminum and other metal values from fly ash},

  author       = {McDowell, William J and Seeley, Forest G},

  abstractNote = {The invention described herein relates to a method for improving the acid leachability of aluminum and other metal values found in fly ash which comprises sintering the fly ash, prior to acid leaching, with a calcium sulfate-containing composition at a temperature at which the calcium sulfate is retained in said composition during sintering and for a time sufficient to quantitatively convert the aluminum in said fly ash into an acid-leachable form.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {Thu Jan 01 00:00:00 EST 1981},

  month        = {Thu Jan 01 00:00:00 EST 1981}

}

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Recovery of aluminum and other metal values from fly ash

Patent McDowell, W J; Seeley, F G

The invention relates to a method for improving the acid leachability of aluminum and other metal values found in fly ash which comprises sintering the fly ash, prior to acid leaching, with a calcium sulfate-containing composition at a temperature at which the calcium sulfate is retained in said composition during sintering and for a time sufficient to quantitatively convert the aluminum in said fly ash into an acid-leachable form.
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Extraction of trace metals from fly ash

Patent Blander, Milton [Palos Park, IL]; Wai, Chien M [Moscow, ID]; Nagy, Zoltan [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 frommore » « less
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