ZHANG Wei , DAI Wenyong

(Plibrico Industries Co., Ltd, Dalian Liaoning 116600, China)

Abstract: Effects of different heat treatment temperatures on properties of a low cement castable for cement kiln were investigated. The castable was prepared with bauxite as raw material, calcium aluminate cement and silica flour as binders. After 24h curing in mould and another 24 h curing at 110℃ after demoulding, the specimens were heat treated at 300℃, 500℃, 700℃, 900℃, 1100℃, 1300℃ and 1500℃ for 3h, respectively. The bulk density(BD), permanent linear change (PLC), modulus of rupture (MOR), cold crushing strength (CCS), abrasion resistance, coefficient of thermal expansion and thermal shock resistance were examined. The results show that with the increasing of heat treatment temperatures, the bulk density of the low cement castable for cement kiln decreases first and then is invariable and increases at last. The permanent linear change is that shrinkage increases first and then decreases and increases at last. The modulus of rupture and the cold crushing strength increase first and then decrease and increase at last. The abrasion loss of the low cement castable for cement kiln which is heat treated at 1500℃ is less than that of the low cement castable for cement kiln which is heat treated at 1300℃. The thermal shock resistance of low cement castable for cement kiln is good.

Key words: cement kiln; heat treatment; low cement castable; modulus of rupture; cold crushing strength; thermal shock

resistance