Abstract
The ammonium salt roasting method is proposed to enrich and recover Mn from low grade ore of manganese carbonate. It included a process of mixing the ore with NH4Cl by ball milling, roasting this mixed ore in pipe stove at 450°Cfor one hour and leaching the calcine with hot water to obtain MnCl2solution. Further, manganese is precipitated by NH3·H2Oand CO2released from roasting process, washing and drying to get concentrated manganese ore. The NH4Cl obtained by vaporizing the filtrate solution can be reused for the ammonium salt roasting process. The result indicates that Mn recovery rate can be reached to be more than 90%. This method is considered to be a green chemistry process to enrich and recover Mn from low grade ore of manganese carbonate.
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