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Dewatering of Red Mud.

Authors
Hood-GD; Wilemon-GM
Source
Pap in Floc in Biotech & Separation Sys Elsevier Sci Publ B V Asterdam 1987 Asterdam:175-185
Link
NIOSHTIC No.
10005635
Abstract
A solid-liquid separation technique was applied to red mud, the caustic-containing residue generated when alumina is extracted from bauxite by the Bayer process. Red mud obtained from Jamaican bauxite was dewatered in laboratory batch tests and small-scale continuous tests to develop an inexpensive method of washing the mud and recovering the valuable sodium aluminate and caustic. A number of high-molecular-weight polymers were evaluated; a high-anionic powder polymer used in combination with a high-anionic emulsion-type polymer proved to be most effective. In small-scale continuous tests using a baffled tube mixer to aid floc formation and a rotating trommel to dewater the solids, slurries with an initial concentration of 10 pct solids were dewatered to 27 pct solids using 0.17 Kg of combined polymer per ton of dry solids. After the trommel treatment, the flocculated red mud was placed in a column fitted with a screen to allow released water to drain; after 15 days, the solids content increased to over 40 pct.
Publication Date
19870101
Document Type
OP;
Fiscal Year
1987
NTIS Accession No.
NTIS Price
Identifying No.
OP 37-87
NIOSH Division
TURC;
Source Name
Pap in Floc. in Biotech. & Separation Sys., Elsevier Sci Publ. B.v., Asterdam, 1987, Pp 175-185
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