The aim of this paper is to investigate the desulphurization process of steel using synthetic slags containing marble waste and aluminum oxide. The tests were performed using a SAE 1020 steel containing 80 ppm of sulfur. The temperature was 1600 °C under an argon flow of 1NL/minute. Each desulfurization test lasted 30 minutes long. Aliquots of steel were removed from the bath every 5 min. Then, each aliquot was characterized by LECO CS240 infrared spectrometer to determine the sulfur content. The results indicated a desulphurization yield up to 78.7 wt% and 70.0 wt% for slags containing aluminum oxide and marble waste, respectively. It was also concluded that the fraction of liquid phase had influence on the desulfurization yield. The maximum desulfurization yield was reached with 83.2 wt% and 82.0 wt% of liquid phase for slags containing aluminum oxide and marble waste, respectively. In addition, in slags containing lime, the maximum desulfurization yield was reached with 85.0 wt% of liquid phase. The tests also demonstrate that in desulfurization processes is necessary containing solid CaO phase in the synthetic slag composition to reach the maximum desulfurization yield. Therefore, the use of aluminum oxide instead fluorspar is an interesting alternate for desulfurization of steel, as well as the replacement of lime for marble waste.
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