Corrosion resistant castable refractory mix

DETAILED DESCRIPTION In accordance with the invention, a particulate mixture capable of mixture with water to form a castable refractory having enhanced corrosion resistance to molten aluminum is provided consisting essentially of 90-94% by weight refractory material and 6-10% by weight zinc borosilicate frit consisting essentially of 50-60% by weight zinc oxide, 20-40% by weight boron oxide, 8-12% by weight silicon oxide, and 0-10% by weight aluminum oxide with less than 0.
5% by weight impurities and wherein the total amount of impurities within the refractory material is not greater than 1% by weight.
In a preferred embodiment, the refractory mixture consists essentially of 24-34 parts by weight calcium aluminate, 60-70 parts by weight fused silica, and 6-10 parts by weight of a zinc borosilicate frit consisting essentially of 50-60% by weight zinc oxide, 30-38% by weight boron oxide, and 8-12% by weight silicon oxide with less than 0.
5% by weight impurities in the frit and wherein the refractory mixture has a total impurity content of 1% by weight.