EUROPEAN STEEL TECHNOLOGY AND APPLICATION DAYS 2017 - ESTAD 2017

Results of the analysis of physical-chemical properties of sinter and pellets are presented. It was shown that at BF transition to operation with high proportion of non-fluxed pellets in furnace charge, it is necessary to change the basic parameters of the slag mode as well as furnaces loading practice. Results of calculation for BF of OJSC “MMK” operation with high proportion of non-fluxed pellets of Sokolov Sarbai Mining Beneficiation Plant in the charge with various content of local sinter are presented. Increasing proportion of pellets in metallic burden leads to reduction in magnesia concentration in the blast-furnace slag. This is accompanied by slag viscosity increasing, reducing its ability to absorb sulfur, as well as rising of melting temperatures of metallic burden with the increase in bottom gas differential pressure and limiting ability of process intensification by hot blast. To increase the concentration of magnesium oxide in the slag at sinter production it is advisable to use the combined basic flux consisting of 70% regular and 30% dolomite limestone.