| abstract |
There is described a proces for the purification of metal oxides which comprises the steps of: (i) roasting a mineral ore in the presence of an alkali; (ii) extracting the desired metal salt produced in step (i); (iii) precipitation of a hydroxide salt; and (iv) converting the hydroxide salt into an appropriate oxide. The process applies to the recovery of alumina, titania and ferric oxide from bauxite and/or red mud. |