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Copper-Sulfate Pentahydrate as a Product of the Waste Sulfuric Acid Solution Treatment
RADMILA MARKOVI, JASMINA STEVANOVI, LJILJANA AVRAMOVI, DRAGUTIN NEDELJKOVI, BRANIMIR JUGOVI, JASNA STAJI-TROI, and MILICA GVOZDENOVI
The aim of this study is synthesis of copper-sulfate pentahydrate from the waste sulfuric acid solution-mother liquor generated during the regeneration process of copper bleed solution. Copper is removed from the mother liquor solution in the process of the electrolytic treatment using the insoluble lead anodes alloyed with 6 mass pct of antimony on the industrial-scale equipment. As the result of the decopperization process, copper is removed in the form of the cathode sludge and is precipitated at the bottom of the electrolytic cell. By this procedure, the content of copper could be reduced to the 20 mass pct of the initial value. Chemical characterization of the sludge has shown that it contains about 90 mass pct of copper. During the decopperization process, the very strong poison, arsine, can be formed, and the process is in that case terminated. The copper leaching degree of 82 mass pct is obtained using H2SO4 aqueous solution with the oxygen addition during the cathode sludge chemical treatment at 80 C 5 C. Obtained copper salt satises the requirements of the Serbian Standard for
Pesticide, SRPS H.P1. 058. Therefore, the treatment of waste sulfuric acid solutions is of great economic and environmental interest.
DOI: 10.1007/s11663-012-9721-8 The Minerals, Metals & Materials Society and ASM International 2012
I. INTRODUCTION
ALL the industries are stringent to take care of the process of manufacturing and of the all pollutants generated in the solid, liquid, or gaseous form according to the environment rules. The industrialization has led to a many-fold decline in the quality of environment in a last few decades. The copper industry generates a huge amount of solid, liquid, and gaseous waste during the copper ore processing procedures to obtain the copper metal, purity of 99.99 mass pct, as nal product. Conventional sulfate bath is used for the rened anode copper that has an average purity of 99.7 mass pct by electrolysis where the elements such as Ni, Fe, Zn, Mn, Pb, Sn, and Co, which have more negative potential than copper, move into solution during electrochemical anode dissolution.[1,2]
During the process when the impurity level...