Magnesite-chrome refractory

A burned basic refractory shape made from a refractory size graded brickmaking batch, said batch comprising from about 75 to 90%, by weight, dead burned magnesite and from about 10 to 25%, by weight, chrome ore, said shape having a lime to silica ratio between about 1.7 and 2.1 to 1 and a chromic oxide to aluminum oxide plus iron oxide ratio in excess of about 1.5 to 1.

A burned basic refractory shape, having high hot strength at 2700.degree. F, good resistance to subsidence and slag erosion and low modulus of elasticity, made from a refractory size graded brickmaking batch, said batch comprising from about 75 to 90%, by weight, dead burned magnesite and from about 10 to 25%, by weight, chrome ore, said shape having a lime to silica ratio between about 1.7 and 2.1 to 1, a chromic oxide to aluminum oxide plus iron oxide ratio in excess of about 1.5 to 1, and a boric oxide content of less than about 0.02%.

A burned basic refractory shape, having high hot strength at 2700.degree. F, good resistance to subsidence and slag erosion, low modulus of elasticity and high spalling resistance, made from a refractory size graded brickmaking batch, said batch comprising from about 75 to 90%, by weight, dead burned magnesite and from about 10 to 25%, by weight, chrome ore, said shape having a lime to silica ratio between about 1.7 and 2.1 to 1, a chromic oxide to aluminum oxide plus iron oxide ratio in excess of about 1.5 to 1, a boric oxide content of less than about 0.02% and an R.sub.2 O.sub.3 content in excess of about 19%.