Liquid purification or separation – Processes – Separating
Patent
1995-07-14
1997-03-04
Reifsnyder, David A.
Liquid purification or separation
Processes
Separating
210787, 210806, 210294, 423121, B01D 2446, B01D 2126
Patent
active
056075987
ABSTRACT:
Red mud bauxite residue produced in the Bayer Process is treated in a plurality of centrifuges and repulp tanks to successively wash and dewater the red mud. A final centrate liquor is obtained in a first upstream centrifuge stage which is rich in alumina and caustic values for respective recovery and reuse. The concentrated red mud cake produced in the final downstream washing/centrifuge step is low in caustic and alumina concentration permitting environmentally friendly disposal. The concentrated red mud cake is reslurried and mixed with bauxite sand for disposal in a dry stacking impoundment area.
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Ormet Corporation
Reifsnyder David A.
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