Papers by Keyword: Manganese Carbonate

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 MnCl₂ solution. Further, manganese is precipitated by NH₃·H₂Oand CO₂ released 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.

Abstract: Mn Forms and the effect on environment of electrolytic manganese residue (EMR) in Chongqing have been investigated through water extracting and sulpharic acid leaching. The ways of comprehensive utilization on EMR has been discussed in this research. The results show that the forms of Mn in EMR are chiefly water soluble Mn (II), the manganese carbonate and manganese dioxide. The groundwater pollution and the eco-environment damage will present if the EMR is randomly stacked and thrown. Having appropriate methods, the EMR may be used as recovery manganese (e.g. manganese sulfate and producing Fe-Mn bimetal oxide). The second residue from EMR can prepare water disposal agent.