Affiliation: | 1.Pontifical Catholic University of Rio de Janeiro, 225 Marquês de S?o Vicente Street, Gávea, Rio de Janeiro, RJ, Brazil ;2.University of Brasilia, Darcy Ribeiro Campus, Asa Norte, Brasilia, DF, Brazil ;3.Mineral Technology Center of Rio de Janeiro, 900 Pedro Calmon Avenue, Rio de Janeiro, RJ , Brazil ; |