Optimizing the hot metal desulphurization process with the usage of rotating lance S.-L. de Souza Costa, E. Pacelli Meireles de Araújo, I. Lopes Alves and J. Lima de Siqueira Rev. Met. Paris, 103 12 (2006) 531-536 Published online: 10 January 2007 DOI: 10.1051/metal:2006120