David Thompson
Electrician at 77 Ave, Arvada, CO
License number
Colorado 980417
Issued Date
Jan 19, 1998
Renew Date
Jan 19, 1998
Type
Electrical Apprentice
Address
Address
10815 W 77Th Ave, Arvada, CO 80005
Professional information
Redox Treatment Of Alunite Ore
US Patent:
4029737, Jun 14, 1977
Filed:
Apr 9, 1976
Appl. No.:
5/675383
Inventors:
Douglas Stevens - Golden CO
Helge O. Forberg - Owensboro KY
Larry D. Jennings - Arvada CO
David L. Thompson - Arvada CO
Julian V. Copenhaver - Arvada CO
Helge O. Forberg - Owensboro KY
Larry D. Jennings - Arvada CO
David L. Thompson - Arvada CO
Julian V. Copenhaver - Arvada CO
Assignee:
Southwire Company - Carrollton GA
National Steel Corporation - Pittsburgh PA
Earth Sciences, Inc. - Golden CO
National Steel Corporation - Pittsburgh PA
Earth Sciences, Inc. - Golden CO
International Classification:
C01F 706, C01F 714
US Classification:
423127
Abstract:
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 a weak base, 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.