RECOVERY OF LEAD AND NOBLE METALS AFTER PROCESSING PRINTED CIRCUIT BOARDS FROM CELL PHONES BY LEACHING WITH MIXTURES CONTAINING HYDROGEN FLUORIDE

by Walner Costa Silva, Roger de Souza Corrêa, Pedro Rosário Gismonti, Júlio Carlos Afonso, Rubens Souza da Silva, Cláudio Augusto Vianna, José Luiz Mantovano