Rheological Transitions of the Solid-Bearing Slag During Cooling Process

© 2018, The Minerals, Metals & Materials Society and ASM International. The viscosity of basic oxygen furnace slag modified by the addition of Al2O3, SiO2, and Na2O was measured via a rotational-type rheometer. The experiment was performed under both continuous cooling condition (5 °C/min) at a constant rotational speed (30 rpm) and isothermal condition at various rotational speeds (between 2 and 120 rpm). The present work suggests that during cooling from liquid to solid, the slag successively undergoes Newtonian regime, shear thinning (time depedent) and thixotropy with a time-dependent apparent yield stress. The corresponding slag microstructure is (1) a fully liquid or partially liquid slag with negligible crystal–crystal interaction in the Newtonian regime, (2) a liquid slag with crystal aggregates/clusters in the shear thinning regime and (3) a skeletal solid network in the regime of thixotropy with a certain level of apparent yield stress.

Publication year:2018

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Authors from:Higher Education

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