IMPROVED PROCESS FOR THE PREPARATION OF ACTIVE MANGANESE DIOXIDE FROM PURE MANGANESE CARBONATE

摘要

Improved process for the preparation of active manganese dioxide from pure manganese carbonate comprising treating ground ore with a sulphatising agent, roasting the reaction mixture, leaching the roasted mass with water, separating manganese sulphate solution by filtration and treating the filtrate with a soluble carbonate or bicarbonate to obtain manganese carbonate as precipitate, characterised in that the roasting of the reaction mixture is carried at a temperature range of 500 to 750C the casted mass is leached with hot water at 60 - 90 C and the manganese carbonate is calcined in the presence off air/oxygen to obtain pure manganese oxide and further leached with a dilute mineral acid to obtain active manganese dioxide.