The reduction process of manganese dioxide in low-grade manganese ore by biomass roasting was investigated. The calcine of manganese oxide ore was further leached by sulphuric acid, the manganese in ore can be converted into manganese sulfate. Effects of the mass ratio of manganese ore to sawdust, roasting temperature and time, leaching temperature and time, leaching agent concentration and liquid-solid ratio were studied. 97.71 % of manganese recovery can be achieved under the optimal conditions: the mass ratio of manganese ore to sawdust of 5:1, roasting temperature at 500 ℃ for 40 min, leaching temperature at 60 ℃ for 40 min, sulphuric acid concentration of 1 mol/L and liquid-solid ratio of 10:1. Other types of low-grade manganese ore like Guilin ore, Nanning ore and Gongcheng ore were tested and the same results were obtained.
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