Rheologscal and Dispersion Behaviour of Calcined Aluminas with Deflocculants

摘要

Several criteria are very significant in the formulation of refractory castables, the water demand should be minimal and the flowability of a castable maximised in the intended application (self-flowed, vibrated castable, etc.). A major component of this is the flowability of the alumina constituent in the cement matrix of castables. These criteria are almost always regarded by refractory customers as a first step. To assist this, one solution is to determine the flowability of alumina and the minimum water demand for its dispersion. The aim of this study is to understand, which mechanism could be at the origin of calcined alumina flowability, in order to enhance these properties. In this sense, this study is aiming to identify which physical (particle size, morphology of particles, pH, zeta potential, etc.) and/or chemical (impurities) parameters could explain the capacity of alumina to flow.