Semi-Plant studies on the beneficiation of ferruginous manganese ore from Siljora-Kalimati Mines, Keonjhar District, Orissa

Abstract

An ingereous process based on low grade temperature gaseous reduction has been developed which economically produces high grade concentrates from low grade ferruginous to initiate the reduction process and yields a friable product which can be easily crushed and ground for subsequent magnetic separation. A concentrate of grade 52.3% Mn with a recovery of low grade ferruginous ore of 7:1 was obtained low grade ferruginous ore from Siljora-Kalimati mines, Keonjhar district, Orissa assaying 37.5% Mn, 16.4% Fe, 1.2% SiO2, 9.0% Al2O3 and 0.08% P. 1.8tons of run-of –mine ore is required to produce a ton of manganese concentrate suitable for making standard grade ferromanganese or for export purposes. The magnetic reject obtained during magnetic separation could be used as the starting material for the production of manganese sulphate.