The production of manganese dioxide from manganese ores of some deposits of the Siberian region of Russia

The reductive leaching of manganese from oxidised manganese ores has been investigated. Preliminary mechanical activation of concentrate was used for increasing manganese extraction. A two-stage leaching with additional grinding of insoluble residue after the first-stage leaching was also carried out for this purpose. Recovery of 98.6-98.9% Mn in solution was achieved in both cases. The purification of solution by a sorption technique was effectively used. Electrolytic grade gamma-MnO2 with a few impurities was obtained. Cells using the manganese dioxide so produced were prepared and tested. (C) 2000 Elsevier Science B.V. All rights reserved.