Effect of solvent ion on red-mud flocculation of Bayer Process

摘要

The effects of solvent ion on red-red-mud slurry flocculation in the Bayer process alumina industry were studied. Test shows that the carbonate ion, humic salt and organic impurity in alumina red-mud slurry will be firstly adsorbed on the surface of slurry ore grains, which will affect flocculation settlement. The experiment results show that the interference of carbonate ion can be eliminate by slaked lime causticizing. It is found that using synthetic macro-molecular polymer can replace large use of starch. The technology of using synthetic macro-molecular polymer instead of starch to clarify slurry can make more place available to adsorb humic salt and organic impurity, and the effect of clarification can be further promoted.