Procedure for the obtaining of aluminum sulphates, abrasive aluminum and potassium and ammonium lights from the electrofilter of a bayer process (Machine-translation by Google Translate, not legally binding)

摘要

Process for obtaining aluminum sulphates, abrasive alumina and potassium and ammonium alums from electrofilter powders of a bayer process comprising the following steps: a) acid leaching of aluminum trihydrate with sulfuric acid to obtain aluminum sulfate and an insoluble residue formed by alpha alumina and transition aluminas; b) attack to dryness with sulfuric acid in oven to sulfate the transition aluminas from the previous stage and obtain abrasive alumina and an acid liquor rich in aluminum sulfates; c) synthesis of alum by precipitation of the liquor obtained in the previous stage with ammonium or potassium or sodium hydroxides, to obtain the corresponding alum and a residual liquor. For use in industrial processes, especially those related to aluminum. (Machine-translation by Google Translate, not legally binding)