Phosphate, Aluminate, And Water Glass Bonded Castables
Phosphate-Bonded Refractory Castables The composition of phosphate-bonded refractory castables is similar to that of general castables. Aggregates and powders include high-alumina, clay, silica, and magnesia. Phosphates such as aluminum phosphate and phosphoric acid react slowly with neutral and acidic aggregates and powders at room temperature. To enable hardening at room temperature, hardeners like active aluminum hydroxide, talc, ammonium fluoride, magnesium oxide, alkaline aluminum chloride, and calcium aluminate cement are added. Magnesium oxide is particularly effective as a hardener, but the…
