Morris L Roberson

US Patent:

40369315, Jul 19, 1977

Filed:

Jun 25, 1976

Appl. No.:

5/699828

Inventors:

Morris L. Roberson - Baton Rouge LA
John W. Beck - Baton Rouge LA
Jack S. Maples - Baton Rouge LA
Anthony Savariste - Plaquemine LA
Donald J. Donaldson - Orinda CA
David L. Stein - Pleasanton CA
Allan C. Kelly - Pleasanton CA

Assignee:

Kaiser Aluminum & Chemical Corporation - Oakland CA

International Classification:

C01F 706

US Classification:

423121

Abstract:

A process is provided which allows control of the impurity level of Bayer process streams with simultaneous generation of an environmentally acceptable effluent and recovery of valuable dissolved aluminum and sodium values. The process involves carbonation of a blow-down stream at 40. degree. -100. degree. C to produce sodium dawsonite [NaAl(OH). sub. 2 CO. sub. 2 ] and an effluent essentially free of dissolved alumina and significantly depleted in dissolved sodium. The sodium dawsonite can be used as such or returned to the Bayer process after thermal decomposition to sodium aluminate. The effluent can be directly discharged into natural receiving bodies without further treatment.

US Patent:

46631330, May 5, 1987

Filed:

Sep 6, 1985

Appl. No.:

6/773265

Inventors:

John T. Malito - Baton Rouge LA
Morris L. Roberson - Baton Rouge LA

Assignee:

Kaiser Aluminum & Chemical Corporation - Oakland CA

International Classification:

C01F 706

US Classification:

423130

Abstract:

High molecular weight organic compounds, such as humic acid derivatives, are removed from Bayer process caustic liquors by oxidation of these compounds. The process involves addition of oxygen to the caustic liquor in quantities in the range established by the solubility of the oxygen in the liquor under the oxidation conditions.

US Patent:

45115427, Apr 16, 1985

Filed:

May 24, 1984

Appl. No.:

6/613701

Inventors:

Joseph L. Anjier - Baton Rouge LA
Morris L. Roberson - Baton Rouge LA
William E. Atchison - Greenwell Springs LA

Assignee:

Kaiser Aluminum & Chemical Corporation - Oakland CA

International Classification:

C01F 714

US Classification:

423127

Abstract:

An improved precipitation system is provided for the Bayer process production of alumina hydrate. In order to produce coarse and strong alumina hydrate at high yield, supersaturated Bayer process sodium aluminate liquor is seeded with a relatively small seed charge in a first precipitator at a relatively low temperature and the produced slurry is transferred to a second precipitator where without additional seeding, the solids content of the slurry is allowed to increase to about 250-700 g/l by accumulating solids in the line until the desired solids content is reached. After a suitable residence time, a coarse, strong product hydrate can be recovered in yields of or exceeding 80 g/l based on the alumina (Al. sub. 2 O. sub. 3) content of the supersaturated sodium aluminate liquor subjected to precipitation. The process not only produces the desired product at high yield but also, due to the use of a single, small seed charge, the precipitation system requires fewer precipitators and classifiers for a given residence time.