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In the iron pellet plants additives are used in the mixing line. Iron ore pellets acquire physical, chemical and metallurgical properties to withstand the subsequent steps up to the loading of the product. Coal and coke added in green iron ore pellets improve their quality, mainly because the burning process is more homogeneous due to better heat transfer. However, one of the major problems of excessive addition of solid fuels to the composition of the iron ore pellet is the formation of a duplex structure within the pellets, thereby reducing the physical quality of the final product and generating fine in the following stage of loading and shipping. Therefore, it is necessary to find an optimal dosage of coke or coal to the pellets in order to improve their physical and metallurgical qualities. Thus, pellets were produced in Pot Grate and evaluated for their physical quality, having as a variable the fixed carbon in three levels (0.7%, 1.0% and 1.3%). The study showed that the best physical quality values (tumbler index and cold compression strength) were obtained for lower fixed carbon dosages (0.7%).

Avaliação da dosagem de materiais carbonáceos em pelotas de minério de ferro sobre sua resistência física