C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/240
C22B 21/04 (2006.01) C01F 7/06 (2006.01) C22B 21/00 (2006.01)
Patent
CA 1049795
ABSTRACT OF THE DISCLOSURE In a process for extracting alumina from alumina-containing ores by individually preheating a slurry of alumina-containing ores in alkali solution, and an alkali solution, and feeding the preheated slurry and tne preheated alkali solution to a digester maintained at a temperature of about 200° to about 300°C, thereby extracting alumina from the alumina- containing ore, the alumina extraction is carried out without any formation of scales on the inside surface of preheater with a considerably prolonged operating duration by preparing a slurry having a molar ratio of Na2O/Al2O3 of not more than 1 from the alumina- containing ores and an alkali solution, subjecting the slurry to preliminary desilication treatment, if necessary, then adding an alkali material to the slurry while preheating the slurry before the slurry reaches a temperature of forming scales originating from deposition of boehmite-type alumina from the slurry, thereby obtaining the slurry having an adjusted molar ratio of Na2O/Al2O3 of more than 1, further preheating the slurry having the adjusted molar ratio to a temperature higher than that of forming scales originating from deposition of boehmite- type alumina from the slurry before the adjustment of the molar ratio. and then extracting the alumina from the alumina-containing ores in the slurry admixed with a separately preheated alkali solution in the digester.
235362
Ishida Takahiro
Yamada Koichi
Yoshihara Masao
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