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A mathematical model is constructed to calculate the unit productivity of a sintering machine that is used at Ural Steel to sinter ores and concentrates from the Kursk Magnetic Anomaly. The effect of the parameters of the sintering operation on the machine's unit productivity is analyzed. Keywords: mathematical model, sintering-machine charge, unit productivity of a sintering machine.The ongoing growth in blast-furnace smelting is making it necessary to increase the productivity of sintering machines while maintaining the present quality of the sinter that is produced. The main indices of the sintering operation and potential ameliorative measures can be studied qualitatively and sintering costs can be reduced by studying the sintering process on the basis of mathematical modeling. The interrelationships that are discovered by this approach can then be used to optimize and control the sintering operation.In connection with this, the goal set for the investigation being discussed in this article was to develop a mathematical model for calculating the unit productivity of a sintering machine used to sinter ores and concentrates from the Kursk Magnetic Anomaly (KMA). To do this, we used information in monthly technical reports issued on the performance of the sinter shop at Ural Steel during the period from January 2005 to September 2013. The reports contain the monthly average for the technological and quality indices of the sintering operation carried out on four sintering machines (each with a sintering area of 84 m 2 ). Tables 1-3 show some of these indices for the sinter shop at Ural Steel in the given period after the statistical data was subjected to a preliminary analysis.This statistical data and results obtained from analyzing the information in the studies [1-6] were used to establish a base set of factors that affect the unit productivity of a sintering machine:the total aerodynamic resistance of the bed of charge materials -the pressure gradient over the height of the bed (the difference between the vacuum above the bed on the sintering-machine strand and the vacuum under the bed (in the collection main) (Fig. 1); the height of the bed determines its average gasdynamic resistance (Fig. 2); the bulk density of the charge, this factor being regarded as a characteristic of the charge's composition (Fig. 3); the granulometric composition of the charge determines the capacity of the bed and depends on the initial composition of the charge, the lengths of time taken for mixing and balling of the charge materials, the designs and operating regimes of the mixers and balling drums (which are expressed through the weighted-mean coarseness of the bed, its coarseness based on an equivalent surface, and its porosity); sintering time is the quotient obtained by dividing the height of the bed by the vertical sintering speed (Fig. 4);4 sintering temperature determines the formation of the re-moistening zone (Fig. 5); the moisture content of the charge affects the quality of its mixing and balling; the content of fi nel...