Abstract
The metallurgical concepts with regard to the structures and properties of calcium aluminate melts have been based upon analogies within ternary CaO-Al2O3-SiO2 systems. In this work the results of surface tension, density and viscosity of some calcium aluminate slags, in the temperature range of 1500 to 1600°C are presented and the results are discussed based upon recent structural characterisation results of crystalline aluminates. The compositional range investigated was from 45 to 53 weight-% alumina. The results indicate a reduction in density as the molar ratio CaO-Al2O3 decreases. Surface tension falls on increasing either the molar ratio CaO-Al2O3 or temperature. Conversely, viscosity increases with increasing molar ratio CaO-Al2O3 and decreasing temperature. The compositional dependence of both surface tension and viscosity data may be associated with the presence of some aluminium ions in octahedral co-ordination, and a concept of surface behaviour is proposed which involves surface activity of aluminate anions containing aluminium ions in a reduced valence state, such as Al2+.
Highlights
The metallurgical concepts with regard to the structures and properties of calcium alumínate melts have been based upon analogies within ternary CaO-Al203-Si02 systems
Se discute la dependencia de las propiedades físico-químicas respecto de las transformaciones estructurales, a la luz de recientes investigaciones de caracterización estructural de los aluminatos de calcio
(19) CAMERON, J et al JISI, 204 Dea, 1966: 1223-1228
Summary
Los aluminatos son importantes como materiales refractarios y escorias metalúrgicas. Escorias alumi-. El estado actual del conocimiento de la estructura y la termodinámica de las fases de aluminatos líquidos es todavía incompleto, aunque suficiente. Estructuralmente, se asume que, semejantes a silicatos líquidos, los aluminatos poseen ajustes estructurales de aniones en diferentes grados de polimerización. Algunas interpretaciones concretas de las propiedades y estructura de escorias alúmino-siliciosas, pueden provenir de informaciones con respecto a los efectos del silicio en la estructuración vitrea y propiedades físico-químicas de aluminatos. El presente trabajo muestra los resultados experimentales de medidas de densidad, tensión superficial y viscosidad en escorias aluminosas, conteniendo 46 a 55% CaO en peso. Se discute la dependencia de las propiedades físico-químicas respecto de las transformaciones estructurales, a la luz de recientes investigaciones de caracterización estructural de los aluminatos de calcio
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