未利用鉄鉱資源について

抄録

In this papery is descri bed tthe progress of studies and practices in respect to iron-sand and pyrrhotite during the past ten years as follows:
1) Fundamental research of pyrrhotite.
2) Beneficiation of pyrrhotite.
3) Mechanical concentration of iron-sand.
4) Reducing roasting of iron-sand.