Process for alumina recovery

Details Process for alumina recovery Process for alumina recovery

C - Chemistry, Metallurgy

01

F

23/246

C01F 7/06 (2006.01) C02F 1/54 (2006.01)

Patent

CA 1176031

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, copolymers of acrylic acid or acrylates containing at least 80 molar per- cent acrylic acid or acrylate monomers and combinations thereof and sub- sequent 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 or acrylate and from about 65 to 25 molar percent of ethyl- enically unsaturated polymerizable monomers.

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