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Development of New Bayer Process Flocculants
Spitzer, D P; Rothenberg, A S; Heitner, H I; Lewellyn, M E; Laviolette, L H; Foster, T; Avotins, P V
Light Metals 1991; New Orleans, Louisiana; USA; 17-21 Feb. 1991. pp. 167-171. 1991

New Bayer process flocculants which contain hydroxamate functional groups have been evaluated in laboratory settling tests in Bayer plants processing a wide variety of bauxites. Such tests have given consistently very low overflow solids, generally < 20% of the solids obtained with conventional polyacrylates. Pilot settler tests have given similar results. Plant settler tests have now also achieved overflow solids reductions of up to 80%. Floc structure and optimum mixing conditions are different from those for polyacrylates, and work is continuing to optimize compositions and application conditions.

Descriptors: Bauxite; Beneficiation; Bayer process; Flocculating; Additives; Acrylic resins