The process in order to loosen the aqueous suspensions of red mud in the manufacture of the alumina by the bayer .

摘要

P process to fluidize the aqueous suspensions of red mud in the manufacture of the alumina by the bayer technique, which consists in dissolving the bauxite (1) by sodium hydroxide, then to separate by settling in the presence of a flocculant (f) the red mud formed (5) in order to separate the alumina (6), and then washed and decant the red mud in the tanks (8, 12, 20, 25) of successive while recycling upstream (13, 21, 22) the washing waters, and finally to eliminate (30, 31) the red muds (24) thus treated, and in which is added to the suspension a mixture containing at least a flocculant (f) and at least one dispersing agent (d), wherein: & br / - in that the flocculant (f) is a polyacrylamide of molecular weight greater than 10 million iu / ml; & br / - and in that the dispersing agent (d) is a polymer of acrylic acid with a molecular weight of less than fifty thousand / p