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Procédé pour séparer le fer et le nickel du cuivre, en traitant des minerais sulfureux et des produits métallurgiques (matte) à teneur de cuivre, au moyen de la fonte avec de la chaux ou calcaire et avec des agents de réduction à teneur de carbone
Procédé d'extraction du cuivre des cendres de pyrites ou des minerais de cuivre, avec obtention simultanée de sulfate de cuivre sans passer par la cémentation