Indresco Inc.

Dresser Industries, Inc.

Albert L Renkey

David J Michael

Stanley R Pavlica

Mark C Kernion

Kenneth A McGowan

A burned chrome-containing refractory and method which provides a refractory having less than 5 ppm total soluble chromium. Such product is obtained by adding to the starting mix less than 10 wt. % (often less than 3 wt. %) zirconia, silica, zircon, or molybdic oxide either individually or in combination.

Burned refractories with low soluble chromium

High purity fused grain and refractory compositions that contain a high purity fused grain made up of 35 to 85 wt. % chromia, 5 to 55 wt. % alumina, and 5 to 45 wt. % magnesia. Burned refractory brick having such a chemistry was found to unexpectedly possess superior resistance to AOD and electric furnace slags.

High purity fused grain in the system Al.sub.2 O.sub.3 -Cr.sub.2 O.sub.3

Refractory brick comprising a refractory aggregate, carbonaceous material and powdered metal bonded with a combination of liquid thermosetting resin and impregnating pitch.

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Bridgeville, PA, United States of America

Albert L Renkey