Development of hydrogen reduction system of metal sulfide under submarine hydrothermal conditions

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Seafloor and oceanic crust are geologically young compared with continental crust, and hydrothermal vents are located at extensional tectonic setting. Ore deposit within the seafloor could be estimated to form at shallower part compared with ore deposit in land, even for open and/or hidden deposits. According to geological characteristics of seafloor ore deposits, active mining technology, which is applied by hydrogen reduction system of metal sulfide, was studied.Pyrite (representative iron sulfide) could be reduced into pyrrhotite and magnetite by hydrothermal reaction, and hydrogen sulfide could produce hydrogen by hydrothermal reaction, and then produced sulfur oxides could be converted into hydrogen sulfide mixed with other biomass (or organic compounds). Those results could extend to establish active mining technology.