Abstract
It is very difficult to process by the usual method the Manchurian mangauiferous ore with the low-grade manganese content, partly due to fine fibrous structure of the ore. However, it is easily reduced on account of its self-fluxing composition.
Magnetic roasting under the oxidizing atmosphere gives sometimes concentrates with about 30% manganese. In order to understand this phenomenon, the ferromagnetic properties of the products from the reaction between the oxides of iron and manganese at temperatures below 1200°C were studied.
Finally a method of utilizing the low-grade ore was proposed. According to the present method the ore is charged to a blast furnace to obtain spiegel iron with about 12% manganese, from which manganese-rich slag through oxidation of the spiegel iron is produced. The production of spiegel iron and its practical aspects were discussed, and experimental studies of the oxidation of the spiegel iron and iron ore on an industrial scale were presented. The authors concluded that the present method is not only technically practicable but also economically possible.
