Abstract
Phase relations in the FeO-ZnO-SiO2 system coexisting with the Fe, which are of considerable practical importance in the extractive metallurgy of zinc, have been studied at 1, 100 K by equilibrating synthetic samples in evacuated sealed quartz tubes. The phases were determined by the X-ray microanalysis and identified using X-ray diffraction. The results indicate that phase relations in the FeO-ZnO-SiO2 system coexisting with the Fe at 1, 100 K are composed of two-phase fields (FeO s.s. + Fe2SiO4 s.s., Fe0 s.s.+ Zn2SiO4 s.s., ZnO s.s.+ Zn2SiO4 s.s., Fe2SiO4 s.s.+ Zn2SiO4 s.s.), three-phase fields (FeO s.s.+ Fe2SiO4 s.s.+ Zn2SiO4 s.s., FeO s.s.+ ZnO s.s.+ Zn2SiO4 s.s.) and single phase fields (Fe2SiO4 s.s., Zn2SiO4 s.s.). The mutual solubilities between FeO and ZnO, between Fe2SiO4 and Zn2SiO4 were determined.The activities of FeO and ZnO in the FeO-ZnO-SiO2 system coexisting with the Fe were estimated by reference to the result of the Fe-Zn-ZnO-FeO system2). The activity of ZnO in the zinc sinter was estimated at unity from the present result and our previous results regarding the binary system ZnO-SiO2, the ternary systemsl) ZnO-SiO2 -CaO, ZnO-SiO2 -Al2O3, ZnO-SiO2 -MgO and the ternary system Fe-Zn-O. The relation between the reaction path of the iron-reduction distillation process and activities of FeO, ZnO in the Fe-Zn-O system at 1, 100 K was shown.
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