Journal of the Southern African Institute of Mining and Metallurgy
On-line version ISSN 2411-9717
PARR, C.; FRYDA, H. and WOHRMEYER, Ch.. Recent advances in refractories - aluminate binders and calcium aluminate bonded high-performance monolithic castables. J. S. Afr. Inst. Min. Metall. [online]. 2013, vol.113, n.8, pp. 619-629. ISSN 2411-9717.
Monolithic refractory castables, bonded with calcium aluminate cements (CACs), have a rich history of nearly 90 years. They have evolved from high-cement conventional formulations to the era of reduced-cement castable systems that can be placed using a variety of techniques such as casting, gunning, self-flow, pumping, and shotcreting. The selection of calcium aluminate binders must be considered carefully in the quest to optimize performance and installation success of refractory monolithics. The paper discusses recent advances in aluminate binders for high-performance castables. A specific focus will be the key issues that impact the reliability and predictability of placing properties. The impact of formulation parameters such as the type of calcium aluminate, additive type and role upon final durability is also assessed. New types of aluminate-based binder systems offering enhanced usage characteristics relevant to high-temperature thermomechanical, abrasion, and corrosion resistance are introduced and their merits compared to existing systems. Future perspectives are discussed, along with possible developments. Conclusions are drawn as to the merits of each type of system and the specific advantages that castable systems possess.
Keywords : castable; refractory monolithic; spinel; ladle..