"The major waste product of the alkaline extraction of alumina from bauxite is known as red mud. All red muds contain either hematite or goethite. The iron oxide is a major constituent and problem in red mud treatment and disposal, and hinders the use of chemical processes for recovering titania and other constituents. An iron removal technique has been investigated to reduce the hematite or goethite in the red mud to magnetite at low temperatures, which can basically be removed by magnetic separation. Magnetic separation will generate a concentrate which could be used by an iron-ore processor, leaving behind a residue smaller in volume for further treatment. This thesis focuses on the investigation of separation techniques used for concentrating the magnetite from the reduced red muds.
The Davis tube tester was used to concentrate the magnetite from reduced red mud. Some parameters of the Davis tube tester operation were studied. The results indicate that the Davis tube tester did not really concentrate the iron in the magnetic fraction. A series of other separation techniques, such as dry magnetic separation, froth flotation, magnetic flotation, electrostatic separation, and gravity concentration have been employed to further concentrate the iron in the magnetic and non-magnetic fractions of reduced red muds. The results show that magnetic flotation and heavy liquid gravity concentration can somewhat lower the iron grade in the non-magnetic fraction.
Physical characterizations, such as XRD, SEM, TEM, and EDS were carried out on the reduced and magnetically separated red muds to determine the mineralogical compositions and interior structures of reduced red muds"--Abstract, page iii.
Schlesinger, Mark E.
Robertson, D. G. C.
Ownby, P. D.
Materials Science and Engineering
M.S. in Metallurgical Engineering
University of Missouri--Rolla
xi, 91 pages
© 2002 Xiaohong Zhang, All rights reserved.
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Zhang, Xiaohong, "Separation of iron from partially reduced red muds" (2002). Masters Theses. 2124.
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