This paper approaches the kinetics of the super-refractory calcia baria aluminous cements' hydration process. Besides a high refractoriness, the cements under investigation must have reactivity with water, which should be adequate for development of hardening resistance structures compatible with obtaining high performance refractory concretes. Based on this, the calcia baria aluminous cements belong to the oxide system BaO – CaO – Al2O3, which complies with the requirements mentioned, with a full delimitation of their significant potential compositions. The information obtained, regarding conversion on hydration and the process kinetics, respectively, have been processed by means of diffusion models, as the most adequate for this process. Three such models have been selected: the Jander model, the Ghinstling – Bronstein model and the Kröger – Ziegler model. Given the nature of the objectives approached in the paper, there have been obtained significant fundamental results, as well as their engineering applications.