Direct reducing method for metal ore

In a high temperature steam electrolysis device using solid electrolyte, a hydrogen gas is generated from steams by using nuclear heat at high temperature from a high temperature gas cooling reactor (HTGR) and electric power generated by the nuclear temperature, to directly reduce metal ores by the hydrogen gas. With such procedures, no CO2 is evolved. Further, steams in a gas mixture of the hydrogen gas and the steams generated from the high temperature steam electrolysis device are adsorbed by a pressure swing type (PSA) steam adsorbing device to be separated from the hydrogen gas. Metal ores are directly reduced by the hydrogen gas separated from steams. With such procedures, since the steams are adsorbed and separated from hydrogen gas in the PSA without condensation, it is possible to reutilize separated steams as a heat source, thereby enabling to improve thermal efficiency. (T.M.)