RED MUD DEWATERING AND WASHING PROCESS

摘要

PCT No. PCT/EP95/04021 Sec. 371 Date Oct. 16, 1997 Sec. 102(e) Date Oct. 16, 1997 PCT Filed Oct. 12, 1995 PCT Pub. No. WO96/11737 PCT Pub. Date Apr. 25, 1996The invention covers a process for dehydration/filtration, and washing of red mud, if applicable with addition of sand, particularly from the Bayer process for aluminum production from bauxite, in which filters are used and caustic is washed out on the filter. The invention is basically characterized by washing and dehydration being effected under pressure above atmospheric with regeneration of bound caustic and production of a residue with a high solids concentration. In addition, the invention covers a plant for the implementation of the process.