Investigation on Shot‐Cast Mixes for Blast Furnace Relining

For relining the blast furnaces at the Salzgitter Flachstahl GmbH (SZFG) shot‐cast refractory concretes were used in the shaft. The degradation of refractories used in this part of the furnaces, whether caused by the action of mechanical impact, vaporized melt constituents, products of fuel and coke combustion, or by batch dusts and vapours, can normally only be assessed after a campaign when the furnace is partially or completely disassembled. Thus, tests for investigation of the materials properties and to predict the behaviour and possible degradation on small laboratory specimens exposed to accelerated working conditions are needed. The current testing procedures for refractory concretes used for relining the shafts of the blast furnaces at the SZFG and the test results are expressed in this publication.