Recovery of aluminum and other metal values from fly ash

Details Recovery of aluminum and other metal values from fly ash Recovery of aluminum and other metal values from fly ash

C - Chemistry, Metallurgy

22

B

53/236, 53/354

C22B 7/00 (2006.01) C22B 21/00 (2006.01)

Patent

CA 1115064

ABSTRACT OF THE INVENTION The invention described herein relates to a method for recovering aluminum from fly ash comprising mixing the fly ash with calcium sulfate or a mixture of calcium sulfate with a material selected from the group consisting of calcium carbonate, magnesium sulfate, or magnesium carbonate, sintering the resultant mixture at a temperature which will convert the fly ash to a crystalline structure, and then leaching the aluminum from the sintered mass with an aqueous inorganic acid.

331231

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