Abstract: Based on existing morphology characteristics of manganese mineral in a low grade manganese ore, technology condition study of reduction roasting-directly acid leaching was done. The results indicated: suitable reduction roasting technologcial conditions: mass ratio of bituminous coal and sample 10%,calcination temperature 700 ℃,calcination time 60 min; suitable leaching condition: liquid-solid ratio 3∶1, sulfate amount 200 mL/kg, stirring speed 250 r/min, leaching time 30 min, finally leaching rate of manganese reached to 92.41%.

Key words: Low grade manganese ore, Reduction roasting, Directly acid leaching