A cleaner and efficient extraction of Mn from low grade Mn High acid consumption is a common problem in the treatment of low grade Mn carbonate ores by H 2 SO 4 leaching process In this study Fe 2 SO 4 3 solution was used to replace the commonly used H 2 SO 4 solution as a leaching agent to leach Mn from low grade Mn carbonate ores and therefore the acid consumption was reduced Simultaneously mechanical activation by ball milling was used to