1. IPT - Institute for Technologial Research of São Paulo State; Laboratory of Metallurgical Processes; Av. Prof. Almeida Prado, 532 05508-901 São Paulo, SP Brazil
2. University of São Paulo; Department of Chemical Engineering; Polytechnic School; Av. Prof. Luciano Gualberto, trav. 3, n. 380 05508-010 São Paulo, SP Brazil