USE OF MAGNESIAN-DOLOMITE MIXTURES IN STEEL-MELTING FURNACE HEARTHS AND THE MECHANISM OF THEIR WEAR IN SERVICE. PT.1. STUDY OF JEHEARTH REFRACTORY MIXTURE

The results of mineralogical-petrographic analysis of Jehearth magnesian-dolomite refractory mixture used in the hearths of steel-melting furnaces are described. The variation regularities of its phase and chemical composition are identified and the mechanism of its wear due to chemical interaction between the refractory and molten metal and slag in service at a metallurgical works is considered. Studies were made on the basis of samples taken from the front bank at the level of the slag belt near the middle blow zone and from the back bank of an open-hearth furnace. 7 refs.