Analysis of pig iron desulfurization with mixtures from the CaO-Fluorspar and CaO-Sodalite system with the use of computational thermodynamics - Grillo, Felipe Fardin; Sampaio, Raphael de Alcantara; Viana, José Flavio; Espinosa, Denise Crocce Romano; Oliveira, José Roberto de (REM: Revista Escola de Minas, 2013)