High content of FeO in primary slag prevents formation of stable skull thereby increasing the thermal load on the fridges and heat losses. Development of indirect reduction reactions that determine the FeO content in primary slag depends on heat transfer conditions. The purpose of this research was to develop methods of modeling of heat transfer in the peripheral zone of blast furnace. The model was developed using the laws of heat transfer and gas dynamics. It allows to estimate the influence of ore load, size distribution of iron materials on development of heat transfer processes and recovery work of the gas flow in blast furnace.