Single cell extraction of zinc and manganese dioxide from zinc sulphide concentrate and manganese ores

Manganese recovery from secondary resources: A green process for carbothermal reduction and leaching of manganese bearing hazardous waste

“…Das et al [25] studied the reaction kinetics of reduction of manganese dioxide with ammonium sulfite solution by heating in the temperature range of 80-110 • C in an autoclave. To obviate the disadvantages encountered in above processes such as high cost of reducing agents, e.g., glucose/sucrose/oxalic acid, high processing time/fuel cost, need of autoclave and use of environmentally hazardous chemistry, a carbothermal treatment process for anode mud utilizing low density oil (LDO) -a liquid phase reducing agent has been developed in our laboratory to render its manganese content leachable in H 2 SO 4 [35] as leaching of partially reduced manganese ore in dilute sulphuric acid is by far the most commonly employed method in the industry for making manganese sulphate [36][37][38][39][40][41][42][43], which may subsequently be used for making manganese compounds such as manganese oxide [44,45].…”

Oxidation of sphalerite in hydrochloric acid medium in the presence of manganese dioxide

“…In recent years leaching of sphalerite concentrate has been widely studied as an alternative to the pyrometallurgical roasting method as it can not only reduce environmental pollution but also offer many other potential advantages over the conventional process. A number of hydrometallurgical routes 1,2 have been developed and some of them are operated commercially.…”