AN IMPROVED PROCESS FOR CONVERSION OF LOW GRADE MAN-GANESE ORE TO A HIGH GRADE NATURAL MANGANESE ORE

摘要

Accordingly the present invention provides an improved process for the conversion of a low grade manganese ore to a high- grade natural manganese ore using a hydrometallurgical beneficiation without reduction and roasting which comprises leaching of the low grade manganese ore with acids accompanied by agitation at a stipulated temperature, followed by filtering to result in high-grade manganese ore having a 99.5 -99.9 % purity of MnO2 with an yield recovery of 70 – 85% of Natural manganese dioxide per ton.