PROCESS FOR REFINING CRUDE MATERIAL FOR COPPER OR COPPER ALLOY

摘要

A process for refining a crude material for copper orcopper alloy which contains as impurity elements at leastone species of Pb, Ni, Sb, S, Bi, and As in combinationwith at least one species of Sn, Fe, and Zn, whichcomprises the sequential steps of(1) melting a crude material for copper or copper alloy,(2a) increasing the oxygen concentration in the melt,thereby oxidizing Sn, Fe, and Zn into slag, (this step iscarried out if the crude material contains as impurityelements at least one species of Sn, Fe, and Zn)(2b) adding to the melt at least one species selectedfrom the group consisting of Fe, Fe oxide, Mn, and Mnoxide, thereby causing Pb, Ni, Sb, S, Bi, and As in themelt to slag in the form of compound oxide of Fe and/or Mn,(3) removing the thus formed slag from the melt, and(4) subjecting the melt to reduction.