Tuscaloosa, AL: U.S. Department of the Interior, Bureau of Mines, RI 8845, 1984 Jan; :1-18
The Bureau of Mines has investigated the effect of refractory oxide additions, introduced in soluble form, on the refractory properties of 42-, 58-, and 70-pct-Al2O3 brick. Brick having porosities ranging from 12 to 16 pct were impregnated with solutions containing chrome, chrome-iron, zirconium, calcium, magnesium, cobalt, nickel, tin, and manganese ions. Additions of some of these ions provided dramatic improvements to such properties as hot modulus of rupture, hot load, and particularly slag resistance. These improvements can be related to reduction of porosity, amorphous grain boundary phases, formation of more refractory bond phases, and reduction of the wettability of Al2O3-containing refractories by metallurgical slags. Fifty-eight-percent-Al2O3 brick, impregnated with chrome, showed hot modulus of rupture, hot load, and slag resistance two to five times better than those of untreated 70-pct-Al2O3 brick. This could result in reducing the nation's dependence on imported refractory-grade bauxite generally required for high-Al2O3 brick, as domestic alumina resources could be used to produce the improved refractories.
Tuscaloosa, AL: U.S. Department of the Interior, Bureau of Mines, RI 8845