Determinação das fases presentes em amostra de sínter produzido em usina siderúrgica através de microscopia eletrônica de varredura

Abstract

Iron ore sinter is one of the raw materials for the steel production and to be loaded in the blast furnace must meet the physical, chemical and metallurgical properties appropriate to the operational stability of the blast furnace. The agglomerate at the end of the sintering process must have good permeability, adequate chemical composition, be resistant at cold temperature, low degradation rate due to reduction at low temperatures and good reducibility. Therefore it is necessary to know the microstructures present. Depending on the composition of its raw materials and firing conditions one can reach different phases of the agglomerate. The sinter consists of a set of various mineral phases, such as hematite, magnetite, calcium ferrite and calcium silicate of chemical composition and varied microstructures. With this, 6 sinter samples hade been produced in a brazilian steel mill. Then, those samples had been submitted to scanning electron microscopy and microanalysed on maps and points by EDS. The presence of vitreous phases, hematite and columnar SFCA is indicated.