Mineralogical Characteristics of Copper Electrorefining Anode Slime and Its Leached Residues

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• 作者：Jhumki Hait ; R. K. Jana ; and S. K. Sanyal
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2004
• 出版时间：April 28, 2004
• 年：2004
• 卷：43
• 期：9
• 页码：2079 - 2087
• 全文大小：531K
• 年卷期：v.43,no.9(April 28, 2004)
• ISSN：1520-5045

文摘

A new approach for the treatment of copper electrorefining anode slime based on hydrometallurgical route involving sulfuric acid leaching with additives such as manganese dioxide andsodium chloride has been developed at National Metallurgical Laboratory (NML), Jamshedpur,India. Mineralogical characterization of the anode slime and the residues after various leachingtreatments, carried out by XRD, SEM, and EDX studies, are reported in this paper. The XRDstudies of the untreated anode slime sample revealed the presence of CuSO₄·5H₂O, NiO, CuSe,BaSO₄, and (Cu_0.2Ni_0.8)O phases. NiO crystals and selenide rings were found in the SEM studies.After sulfuric acid leaching, the residues under X-ray diffraction analysis showed the absenceof the (Cu_0.2Ni_0.8)O phase. When MnO₂ was added during sulfuric acid leaching, the new phasesMnSe and CuSeO₃·2H₂O were found in XRD studies of the residue. The general view of theresidue under SEM revealed a number of porous structures favoring the ash-diffusion-controlledreaction in leaching. Leaching with both MnO₂ and NaCl in the sulfuric acid medium resultedin precipitated AgCl in the residue, as observed by XRD studies. The porous AgCl mass observedunder SEM confirmed the ash-diffusion-controlled nature of the leaching reaction.