Several criteria are very significant in the formulation of refractory castables, the water demand should be minimal and the flowability of castable has to be maximum in the intended application (self-flowed, vibrated castable, etc.). Another significant criterion is the flowability of the alumina constituent the cementitious matrix of castable, criteria almost regarded by refractory customers in a first step. For this, one solution is to determine the flowability of alumina and the minimum water demand for its dispersion. The aim of this part of studies is to understand which mechanism could be at the origin of calcined alumina flowability, in view to enhance these properties. In this sense, we tried in this study 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.
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