Viscosity of blast furnace type slags
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8/28/03
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Viscosity of Blast Furnace Type Slags NORITAKA SAITO, NAOTO HORI, KUNIHIKO NAKASHIMA, and KATSUMI MORI The effect of MgO, TiO2, or Fe2O3 on the viscosity of 40CaO-40SiO2-20Al2O3 (mass pct) slags has been measured by the rotating crucible viscometer. Viscosity of these quaternary slags decreased with an increase in the content of additive oxide. At the same content of additive oxide, the viscosity decreases from MgO, TiO2 to Fe2O3. In addition, the effect of SiO2 or Al2O3 on the viscosity of 26.1CaO-73.9Fe2O3 (mass pct) (CF) and 14.9CaO-85.1Fe2O3 (mass pct) (CF2) slags has been measured. Viscosity of calcium ferrite slags increased with increasing SiO2 or Al2O3 content. Al2O3 was found to be more effective for increasing the viscosity at the same content of the additive oxide.
I. INTRODUCTION
VISCOSITY of molten slag changes in wide range depending on temperature and composition. Several of factors in a blast furnace process, such as the rate of various reactions and the fluid flows, are affected by the properties of molten slag. Among them, it is well known that the viscosity is an important physical property for understanding the network structure of slag melts and for simulating the rate of various phenomena in high-temperature metallurgical processes. Numerous viscosity measurements have been carried out for binary or ternary slags in the last several decades.[1–7] Although practical slags related to the ironmaking process are multicomponent systems, there are few data available on their viscosities. Furthermore, errors in the values of viscosity depending on published data range within 25 to 50 pct.[8] Thus, the accuracy of measurements in viscosity for multicomponent slag and flux is strongly required for understanding of the reaction behavior in the iron-making process. In recent years, the amount of demanded sinters in the blast furnace process has been increased to achieve high productivity. It is important to clarify the role of the liquid slag during the sintering process of ores, for the formation of liquid slags, and its flow controlling the strength and the reducibility of sinters in a blast furnace. However, there is no viscosity data available for this slag. Here, the effect of adding MgO, TiO2, or Fe2O3 on the viscosity of 40CaO-40SiO2-20Al2O3 (mass pct) slags relating to blast furnace was investigated. In addition, the effect of adding SiO2 or Al2O3 on the viscosity of calcium ferrite melts, 26.1CaO-73.9Fe2O3 (mass pct) (CF) and 14.9CaO-85.1Fe2O3 (mass pct) (CF2) relating to liquid-phase sintering of ore, was also measured.
NORITAKA SAITO and NAOTO HORI, Graduate Students, KUNIHIKO NAKASHIMA, Associate Professor, and KATSUMI MORI, Professor, are with the Department of Materials Science and Engineering, Graduate School of Engineering, Kyushu University, Fukuoka-city, Fukuoka 812-8581, Japan. Contact email: [email protected] This article is based on a presentation given in the Mills Symposium entitled “Metals, Slags, Glasses: High Temperature Properties &
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