Author/Authors :
Darmane، نويسنده , , Y. and Cherkaoui، نويسنده , , M. and Kitane، نويسنده , , S. and Alaoui، نويسنده , , A. and Sebban، نويسنده , , A. Ouazzani Touhami and A. Douira، نويسنده , , M. Ebn Touhami، نويسنده ,
Abstract :
The preparation of manganese(IV) oxide from a Moroccan pyrolusite mine waste was studied. A sample of mine waste containing about 35% Mn was leached with 6.36 M HCl at 70 °C for 1 h with 98% leaching efficiency. The resulting solution was conditioned at pH 5 and sodium hypochlorite was added to obtain various oxide phases (Mn2O3, MnO2). Finally the oxides were transmuted by addition of nitric acid to obtain the α-MnO2, nH2O phase with 97% purity.
Keywords :
Pyrolusite , HCl leach , Hypochlorite , transmutation , MnO2
