REDOX TREATMENT OF ALUNITE ORE

This invention relates to a method for recovering aluminum hydroxide from alunite ore by roasting the ore to remove water of hydration, roasting it again in a reducing atmosphere to remove sulfate, roasting a third time in an oxidizing atmosphere to convert any sulfides formed in the second roast, l...

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Hauptverfasser: JULIAN VAWTER COPENHAVER, JR, LARRY DEAN JENNINGS, FRANCIS JOHN BOWEN, DAVID LANG THOMPSON, FRANK MOE STEPHENS, JR, DOUGLAS STEVENS, HELGE OLE FORBERG
Format: Patent
Sprache:eng
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Zusammenfassung:This invention relates to a method for recovering aluminum hydroxide from alunite ore by roasting the ore to remove water of hydration, roasting it again in a reducing atmosphere to remove sulfate, roasting a third time in an oxidizing atmosphere to convert any sulfides formed in the second roast, leaching with water to remove potassium and sulfate, extracting the aluminum content with a mixture of sodium hydroxide and potassium hydroxide, removing contaminant silica from the leach solution, and precipitating aluminum hydroxide by cooling and seeding the solution.