Salt-soda sinter process for recovering aluminum from fly ash

Patent · Thu Jan 01 00:00:00 EST 1981

OSTI ID:863825

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

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1. Oak Ridge, TN

A method for recovering aluminum values from fly ash comprises sintering the fly ash with a mixture of NaCl and Na.sub.2 CO.sub.3 to a temperature in the range 700.degree.-900.degree. C. for a period of time sufficient to convert greater than 90% of the aluminum content of the fly ash into an acid-soluble fraction and then contacting the thus-treated fraction with an aqueous solution of nitric or sulfuric acid to effect dissolution of aluminum and other metal values in said solution.

• Research Organization: Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
• DOE Contract Number: AC04-76
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4254088
• OSTI ID: 863825
• Country of Publication: United States
• Language: English

Related Subjects

salt-soda
sinter
process
recovering
aluminum
fly
ash
method
values
comprises
sintering
mixture
nacl
na
temperature
range
700
degree
-900
period
time
sufficient
convert
90
content
acid-soluble
fraction
contacting
thus-treated
aqueous
solution
nitric
sulfuric
acid
effect
dissolution
metal
metal values
time sufficient
fly ash
aqueous solution
sulfuric acid
recovering aluminum
comprises sintering
treated fraction
sinter process
/423/