Redox treatment of alunite ore

Details Redox treatment of alunite ore Redox treatment of alunite ore

C - Chemistry, Metallurgy

01

F

53/240, 23/250

C01F 7/02 (2006.01) C01F 7/06 (2006.01)

Patent

CA 1066026

ABSTRACT OF THE DISCLOSURE This invention relates to a method for recovering aluminum hydroxide from ore containing alunite by roasting the ore to remove the water of hydration, leaching the roasted ore with a weak base to remove potassium and sulfate, extracting the aluminum content with a mixture of sodium hydroxide and potassium hydroxide, and precipitating aluminum hydroxide crystals from the solution. Between the dehydration and leaching steps there are provided the steps of roasting the dehydrated ore prior to leaching in a reducing atmosphere to remove sulfate and then roasting the reduced ore in an oxidizing atmosphere to convert sulfides present after the reduction step to sulfur oxides.

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