Use of refractory concretes to line steel tapping runners

Abstract

With the aim of reducing the consumption of chamotte brick and possible mechanization of lining operations, the Zaporozhe Industrial Institute, in collaboration with the ' Zaporozhstal'" Works, has made industrial tests on monolithic linings of steel-tapping runners made of chrome--magnesite compound.At present the steel-tapping runners at the Zaporozhstal' Works are laid with chamotte bricks, of which the specific consumption is about 1.4 kg/ton steel. To protect the masonry from the action of fused metal and slag, it is covered with a layer of chamotte--clay--coke compound. However, the high open porosity (39.~7o) and low compressive strength (2.5 MPa) of the coating do not satisfy the service conditions of the lining. During tapping the fused steel erodes the protective coating and the lining. Moreover, the metal and slag stick to the masonry.