Process for alumina recovery

Details Process for alumina recovery Process for alumina recovery

C - Chemistry, Metallurgy

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C02F 1/56 (2006.01) B01D 21/01 (2006.01) B03D 1/016 (2006.01) B03D 3/06 (2006.01) C01F 7/06 (2006.01) C02F 1/52 (2006.01) C02F 1/54 (2006.01)

Patent

CA 1192322

PROCESS FOR ALUMINA RECOVERY Abstract of the Disclosure Aqueous suspensions of red mud are effectively removed from the Bayer process for making alumina by the addition to at least the first stage of the caustic recovery circuit of a flocculant selected from the group consisting of starch, homopolymers of acrylic acid or acrylates, co- polymers of acrylic acid or acrylates containing at least 80 molar percent acrylic acid or acrylate monomers and com- binations thereof and subsequent addition to later, more dilute stages in the caustic recovery circuit of a copolymer containing from about 35 to 75 molar percent of acrylic acid of acrylate and from about 65 to 25 molar percent of ethylenically unsaturated polymerizable monomers.

415406

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