Process of extraction of aluminum values from coal ash

Details Process of extraction of aluminum values from coal ash Process of extraction of aluminum values from coal ash

1978-05-23

1981-01-06

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group iiia metal or beryllium

423111, C01F 766

Patent

active

042436400

ABSTRACT:
A process for preparing a solution of high aluminum content from the combustion residue of a solid carbon-containing fuel having a carbon content of 2% or less by weight and an iron content calculated as Fe.sub.2 O.sub.3 of 4% or less by weight is described. The process consists of (a) pretreating said residue with nitric acid at a temperature lower than the next extraction stage which follows and removing the nitric acid solution from the residue and then (b) extracting said treated residue with nitric acid of strength about 30% to 65% by weight strength at about 100.degree. to 225.degree. C., the amount of nitric acid employed in said pretreatment step and in said extraction step being in excess of the cationic equivalent actually dissolved in each step.

REFERENCES:
patent: 1792410 (1931-02-01), Buchner
patent: 2174825 (1939-10-01), Freling et al.
patent: 3211524 (1965-10-01), Hyde et al.
patent: 3240562 (1966-03-01), Brown et al.
patent: 3383166 (1968-05-01), Gerry et al.
patent: 4069296 (1978-01-01), Huang

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