FIELD: polymer materials.
SUBSTANCE: according to first embodiment, precipitation of suspended solids in Bayer process liquid comprises addition of polymer thereto containing side salicylic acid groups, said polymer being obtained via radical polymerization of (i) one or more acrylate monomers selected from group consisting of methacrylate and acrylic acid and (ii) one or more salicylic acid-containing monomers selected from group consisting of 4-methacrylamidosalicylic acid, 4-methacrylamidosalicylic phenyl ester, acid O-acetyl-4-methacrylamidosalicylic acid and O-acetyl-4-methacrylamidosalicylic acid phenyl ester. According to second embodiment, precipitation of suspended solids in Bayer process liquid comprises addition of polymer thereto containing salicylic acid groups in principal chain, said polymer being selected from group consisting of salicylic acid/formaldehyde copolymer and condensation polymer of salicylic acid, formaldehyde, and one or more compounds with active hydrogen selected from group consisting of amides, ureas, amines, and aromatics.
EFFECT: enhanced clarification process efficiency.
15 cl, 18 tbl
