Abstract
The pore-radius distributions in the reduced iron from magnetite and wustite containing several foreign oxides were measured by the mercury penetration method, and the cross sections of the wustite grains in the partially reduced samples were observed.The following results were obtained.(1) Wustite grains reduced from magnetite containing Al2O3 are reduced nontopochemically and the micro pores are formed in the reduced iron. However, this behavior is not observed when the wustite as a starting material contains Al2O3.(2) Wustite grains which are reduced from magnetite and wustite containing CaO are reduced nontopochemically and the pore radius becomes larger with increasing the quantities of CaO.(3) Wustite grains containing MgO are reduced topochemically as in the case of pure wustite grains and the addition of MgO gives little effect to the pore-adius of reduced iron.(4) It is concluded that those effects of Al2O3 and also CaO can be found when the compounds of the foreign oxides with iron oxides are precipitated in wustite during the reduction.
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