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Brazil is the second-largest producer of iron ore in the world. Brazilian richer superficial deposits are composed of brittle material with fine texture and significant amounts of fines are generated during mining and transport. Another type of ore found in this country is the itabirites that have lower iron contents. Beneficiation and concentration steps are required to prepare these materials for the pelletizing process. A general view of Brazilian types of iron ores, mines, and mining companies is given in this work. Special attention is given to pelletizing and the influence of mineralogical characteristics of different ores on the production and final properties of iron ore pellets. [ABSTRACT FROM AUTHOR]

Results are given for analysis of agglomerate and pellet physicochemical properties. It is shown that with transfer of blast furnace smelting into an operating regime with a high proportion unfluxed pellets in a charge requires changing the main slag regime parameters, and also the furnace charging regime. It is established that due to the difference in agglomerate and pellet physicomechanical properties, and also as a result the high corrosiveness of primary slag obtained using unfluxed pellets, it is necessary to change the regime for material charging into a furnace. With an increase in the proportion of Sokolovo-Sarbaiskii Ore Mining and Processing Combine pellets in Magnitogorsk Metallurgical Combine blast furnace charge, there is a reduction in amount of magnesium in final blast furnace slags. This is accompanied by an increase in molten slag viscosity, a reduction in its sulfur absorbing capacity, and also an increase in the temperature range for iron ore mix melting with an increase in bottom gas pressure drop and limiting melt blast force. [ABSTRACT FROM AUTHOR]

The process of pelletizing iron ore on disc pelletizers is mathematically modeled. Different methods of regression analysis are used to describe the pelletizing operation, and the equations that are obtained are compared with one another. The objective function is optimized based on the yield of green pellets of the class (-14+5) mm. [ABSTRACT FROM AUTHOR]