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In this paper, the overall and zonal thermal balances of the blast-furnace smelting were analyzed. Under the current blast furnace smelting conditions, the specific consumption of coke is determined by the development of the heat transfer processes occurring in the lower zone of the furnace. In this case, the heat losses found by using the heat balance of the lower zone of the furnace sufficiently reflect such technological factors as specific coke consumption and silicon content in cast iron. It was shown that the existing methods of analytical calculation of the heat losses occurring during smelting of cast iron in blast furnaces do not adequately reflect the actual melting process. It was established that the analysis of the heat balance of the lower stage of heat transfer enables determining the heat losses in this zone of the furnace and estimating the correction factors when the blast furnace smelting conditions change. The control of heat losses is necessary for estimating the condition of the blast furnace masonry, rational gas distribution, and also, for adjustment of coke consumption. [ABSTRACT FROM AUTHOR]