* Technical contribution to the 47º Seminário de Aciaria – Internacional, part of the ABM Week, September 26 th -30 th , 2016, Rio de Janeiro, RJ, Brazil. EVALUATION OF CAST IRON DESULFURIZATION WITH SYNTHETIC SLAGS* Felipe Fardin Grillo 1 Eduardo Junca 2 Rodrigo de Oliveira Pezzin 3 Rüdiger Deike 4 José Roberto de Oliveira 5 Gustavo Bretz 6 Denise Crocce Romano Espinosa 7 Abstract The aim of this work was to study the use of slags to desulfurization of cast iron. It was proposed to use alumina instead fluorspar. In addition, marble waste was used instead lime. Simulations applying Thermo-Calc software were performed in order to obtain the theoretical phases thermodynamic data. Then, a comparison between theoretical data and experimental tests were performed. The cast iron was melting in induction furnace at 1550°C. Slags composed mainly for CaO and Al2O3 were used to cast iron desulphurization. It was observed that increasing liquid phase, the desulphurization reaction was favored. Besides, it was found that cast iron desulfurization occurs by top slag mechanism. Keywords: Desulfurization; Fluorspar; Marble waste; Cast iron. 1 Doutor em Engenharia Metalúrgica e de Materiais – USP, Pós-doutorando no Instituto Federal de Educação, Ciência e Tecnologia do Espírito Santo (IFES), Vitória, ES, Brasil. 2 Doutor em Engenharia Metalúrgica e de Materiais – USP, Pós-doutorando no Instituto Federal de Educação, Ciência e Tecnologia do Espírito Santo (IFES), Vitória, ES, Brasil. 3 Engenheiro Metalurgista, Mestrando em Engenharia Metalúrgica e de Materiais no Instituto Federal de Educação, Ciência e Tecnologia do Espírito Santo (IFES), Vitória, ES, Brasil. 4 Prof. Dr.-Ing. Rüdiger Deike, Universität Duisburg-Essen, Institut für Metallurgie und Umformtechnik, Duisburg, Norddrhein-Westfalen, Deutschland. 5 Professor Doutor do programa de pós-graduação em Engenharia Metalúrgica e de Materiais do Instituto Federal de Educação, Ciência e Tecnologia do Espírito Santo (IFES), Vitória, Brasil. 6 Master in Metallurgie und Umformtechnik, Universität Duisburg-Essen, Institut für Metallurgie und Umformtechnik, Duisburg, Nordrhein-Westfalen, Deutschland. 7 Professor Associado do Departamento de Engenharia Química, Universidade de São Paulo (USP), São Paulo, Brasil. 285 ISSN 1982-9345