THE INFLUENCE CONDITIONS OF FORMATION A LAYER OF GRANULAR IRON ORE AND OF BAUXITES MATERIALS ON THE HEAT TRANSFER COEFFICIENT

To ensure competitiveness of the domestic metallurgical production enterprises against the background of General rise in price of energy resources the detailed study and sinter production process thermal mode improvement is required. The latter will allow to perform temperature regime of the agglomeration of individual horizons of sintered charge and to develop recommendations aimed at improving the efficiency of the agglomeration process. The temperature field in the heat treatment processes of a dense layer of granular material depends largely on the magnitude of the heat transfer coefficient that defines the intensity of thermal phenomena development. Agglomeration of iron ore and bauxite materials produced on machines of conveyor type, loading of bulk material is different boot system, which determines the layer structure of the bulk material prepared for heat treatment. The results of research aimed at the study of the granulometric composition of the layer of bulk iron ore and bauxite material, the formation of which is carried out with use of loading in the form of drum and vibratory feeders in conjunction with boot tray are presented in the paper. The values of the change of the average diameter of the particles of material on the layer height are prepared for sintering. It is established that the loading device has a significant impact on the nature of the distribution of size fractions of the bulk material. The latter determines the pattern of changes in the magnitude of volumetric coefficient of heat transfer height of the pallet. The obtained results allow to carry out studies of the thermal regime of sintering on the basis of the developed model, which will formulate recommendations to the conditions of sinter charge layer formation in order to ensure desired distribution of chemical compounds and solid fuels in each horizon and stabilization of sintering temperature-time regime.