Process of extraction of aluminium values from coal ash

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

C - Chemistry, Metallurgy

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B

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C22B 7/00 (2006.01) C01F 7/24 (2006.01) C01F 7/66 (2006.01) C22B 21/00 (2006.01)

Patent

CA 1113254

- 1 - 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 Fe203 of 4% or less by weight, which comprises: (a) pretreating said residue with nitric acid at a temperature lower than the next extraction stage which follows, in order to obtain optimum solution of impurities combined with minimum solution of aluminum, 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° to the amount of nitric acid employed in said pretreatment step and in said extraction step being in excess of the cations actually dissolved in each said step.

323095

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