According to the prevailing process of blast-furnace ironmaking and oxygen-converter steelmaking, a new technique named “precise reduction of Iron Oxide-separation of non-molten” was brought up. The equipment of the precise reduction was designed and improved, and L16(2^15) and L4(2^3)orthogonal table was planed, which were used in the experimental study of the precise reduction of magnetite in Kazuo and the steel dust of a factory. The results of the precise reduction showed that in the atmosphere of pure H2 and 100% CO, the iron oxide at the micron size can be reduced to metallic iron with high reduction degree. The study on dissociation, sintering, iron magnetic for the precise reduction product of iron oxide showed that the lower reduction temperature makes it possible for the iron oxide reduced to the magnetic metallic iron at the non-melting state. The reduction of product keeps power state and its interparticle sintering does not occur, which means that it is reasonable to separate iron from other impurity elements through the physical method.
