Development of High Quality Magnesite-Chrome Bricks for Secondary Steelmaking Furnaces

摘要

This paper describes developments of high quality magnesite-chrome bricks used for secondary steelmaking furnaces, mainly including direct-bonded magnesite-chrome brick, fully synthesized (co-clinker) magnesite-chrome brick, semi-rebonded magnesite-chrome brick and fused grain rebonded magnesite-chrome brick. Investigations have also been conducted on the effects of various chromites on the properties of the direct bonded magnesite-chrome brick, effects of different sesquioxides (Cr_2O_3, Al_2O_3, Fe_2O_3) on the properties of the fully synthesized (co-clinker) magnesite-chrome brick and effects of ZrO_2, Cr-Fe alloy, ultra-fine powders on the properties of the fused grain rebonded brick and the semi-rebonded magnesite-chrome brick. Applications of the bricks in various secondary steelmaking furnaces have been briefly introduced as well.