The general regularities and mechanism of the process of sintering of iron ore are considered, taking into account the transformation occurring during sintering and with the participation of components of heterogeneous systems. It is shown that in heterogeneous systems during sintering significant influence on the change of mineralogical composition of the finished agglomerate is influenced by the amount of introduced ore and CaO due to which the phases are formed, which provide sufficient strength of the finished product. Microstructure studies have shown that the appearance of calcium ferrite agglomerates between magnetite grains and a decrease in the amount of silicate glass increases the agglomerate strength. Analysis of the sintering results shows that the ore substitution has no significant effect on the strength of the test sinter. However, with the ratio of ore / concentrate 9/1, the time at which the maximum temperature of the exhaust gases is reached is increased, which may be due to the change in the porosity of the charge layer when larger particles of iron ore are used. Obtaining agglomerate of a given basicity and properties is carried out at the size of limestone and solid fuel within 0-3mm, the size of the room-ore concentrate to 0.1 mm, iron ore was used without sieving by fractions, the humidity of the charge 7 - 8%, the consumption of solid fuel for the process 6 - 8%. The positive effect of the replacement of iron ore concentrate with the iron ore deposit "SUKHA BALKA" may be related to the chemical composition of the ore, which is rich in ore and contains aluminum oxide and magnesium oxide. Aluminum oxide promotes the formation of calcium Al2O3•SiO2•Fe2O3 and provides sufficient metallurgical strength for the agglomerate. The amount of magnetite decreased as it was spent on the formation of aluminosilicopherite. In addition, during crystallization, magnesium enters the lattice of two-calcium silicate and prevents the polymorphic transformation of β2CaO • SiO2 → γ 2CaO • SiO2, which also affects the strength of the agglomerate.