Pipeline Scaling Prevention and Removal Methods in Bayer Digestion Process

Abstract

Indirect heating digestion process can greatly reduce the energy consumption and raise economic benefits in alumina production. In the digestion process of diaspore type bauxite, Since the silicon titanium compound precipitation, the device wall will form a hard, dense encrustation, causes the device to heat transfer coefficient decreased. In view of Chinese high silicon insoluble diaspore type bauxite mineral characteristics, the microstructure of the silicon titanium scaling and mineral composition have been analyzed. The scale prevention and removal methods have been studied. Using bauxite slurry fully predesilication and predetitanium can effectively reduce and prevent fouling formation, application of catalytic acid leaching can loose hard, dense silicon titanium scaling, and high pressure water washing, such scaling can be easily washed away.