Calderys India has been in the Blast Furnace Trough (BFT) management business since mid 90s. In the early days of our BFT management, we offered Calcium Aluminate Cement (CAC) bonded alumina - silicon carbide - carbon castable. It is wellknown that CAC brings in lime, which acts as a fluxing constituent in any alumino - silicate system. BFT castable also falls in alumino - silicate category and hence are adversely affected by CAC addition. Owing to this fact, we worked on an alternate lime - free bonding system for BFT castable and a solution was arrived at by replacing CAC by silica sol. as binder. This specific success has led to significant reduction in wear rate of the BFT castable during its use.
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