IMPROVE SOME PROPERTIES OF REFRACTORY MORTAR MANUFACTURED FROM GROG BAUXITE, ATTAPULGITE, CAO AND WHITE CEMENT BY USING GUM ARABIC

This research investigates the possibility of produce refractory mortar which can withstand at high temperatures in the industrial furnaces for different industries. The raw materials used represented by (Grog Bauxite, Attapulgite, CaO, White Cement and Gum Arabic). In this study, we used Gum Arabic liquid for the first time instead of solution of sodium silicate as adhesive material to improve cold bonding strength. Many types of mixtures are prepared with different ratios of the materials. The mortar mixtures were prepared by adding water to dry components, some mixtures prepared by adding gum Arabic liquid with weight ratio 40% of dry content. The samples of mortar were sintered at (1350, 1400, 1450) C°. Experimental study was carried out to evaluate physical and mechanical properties of mortar based on (sieve analysis, refractoriness, bonding strength, bulk density, and linear firing shrinkage). The results show that two types of refractory mortars that prepared by adding gum Arabic liquid have properties conform to the requirements of standard ASTM C64 with cold bonding strength more than 1.38MPa, the first type has accepted refractoriness at sintering temperature 1400 C°, the second one has accepted refractoriness at sintering temperature 1350C°