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Journal Articles

Effect of oxygen partial pressure on the viscosity of iron-bearing alkaline-earth silicate slags

Sukenaga, Sohei*; Osugi, Takeshi; Inatomi, Yosuke*; Saito, Noritaka*; Nakashima, Kunihiko*

Journal of MMIJ, 129(5), p.203 - 207, 2013/05

Viscosity changes of RO-SiO$$_{2}$$-FexO (R = Ca, Sr, Ba) melts due to changes in the oxidation states of the iron ions by systematically varying the oxygen partial pressure were measured at 1773 K. The initial compositions of the samples were 30RO-60SiO$$_{2}$$-10Fe$$_{2}$$O$$_{3}$$(mol%), and the ratio of Fe$$^{3+}$$ toFe$$^{2+}$$ in the RO-SiO$$_{2}$$-FexO melts increased with increasing oxygen partial pressure in all samples. Meanwhile, the viscosity of all the RO-SiO$$_{2}$$-FexO melts decreased with increasing Fe$$^{2+}$$ to total-Fe ratio (Fe$$^{2+}$$/t-Fe). The data indicate that the increase in the amount of Fe$$^{2+}$$ ions, which behave as network modifiers, would result in depolymerization of the silicate anions. In addition, the viscosity of the melts increased in the order of alkaline-earth cationic radius (Ba $$>$$ Sr $$>$$ Ca) when the Fe$$^{2+}$$/t-Fe values of the melts were comparable. This would be due to the change in the coordination structure of Fe$$^{3+}$$ in the melts.

Journal Articles

Effect of oxidation state of iron ions on the viscosity of alkali silicate melts

Osugi, Takeshi; Sukenaga, Sohei*; Inatomi, Yosuke*; Gonda, Yoshiyuki*; Saito, Noritaka*; Nakashima, Kunihiko*

ISIJ International, 53(2), p.185 - 190, 2013/02

 Times Cited Count:16 Percentile:64.15(Metallurgy & Metallurgical Engineering)

Understanding the changes in viscosity due to the different oxidation states of iron ions is important for simulating phenomena related to molten slags and also for understanding the structure of iron-oxidecontainingsilicate melts. However, these viscosity changes are not well understood. Here, we show the viscosity changes of R$$_{2}$$O-SiO$$_{2}$$-FexO (R = Li, Na, or K) melts due to changes in the oxidation states of the iron ions by systematically varying the oxygen partial pressure using several Ar-based gases at 1773 K. Not only the oxidation state of the iron ions but also the coordination structure of Fe$$^{3+}$$ may be important for understanding the viscosity.

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