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In the Bayer process of alumina production, flocculants of polyacrylamide (PAM) species are often added in the sedimentation process of red mud, and a little amount of PAM follows the overflow and enters the seeded precipitation process of sodium aluminate liquors, so it is necessary to study the effect of PAM species on the seeded precipitation process.Effect and its action mechanism of cationic PAM on the seeded agglomeration of sodium aluminate liquors were investigated, conclusions were drawn as follows.