Recovery of aluminum and other metal values from fly ash

Patent · Wed Dec 31 23:00:00 EST 1980

OSTI ID:863810

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

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1. Oak Ridge, TN

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.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
• DOE Contract Number: W-7405-ENG-26
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4252777
• OSTI ID: 863810
• Country of Publication: United States
• Language: English

Related Subjects

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