PROCESSING OF A METAL CONCENTRATE FROM GROUND WASTE PRINTED CIRCUIT BOARDS IN ACIDIC MEDIA USING HYDROGEN PEROXIDE AS OXIDANT by Calvin Sampaio Moreira da Silva, Guido Tande Crespo Zeba, Christiano Mota Rodrigues da Rocha, Pedro Rosário Gismonti, Júlio Carlos Afonso, Rubens Souza da Silva, Cláudio Augusto Vianna, José Luiz Mantovano

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