Recovery of aluminum and other metal values from fly ash

Patent · Thu Jan 01 00:00:00 EST 1981

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 (United States)
• 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

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/