David Thompson
Electrician at 77 Ave, Arvada, CO
License number
Colorado 107239
Issued Date
Jan 2, 2003
Renew Date
Oct 1, 2014
Expiration Date
Sep 30, 2017
Type
Journeyman Electrician
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.