Results 121 to 130 of about 211 (161)
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Experimental Modeling of Nodulation in Copper Electrorefining
Minerals, Metals and Materials Series, 2018Concerning nodulation in copper electrorefining, it has been reported that short circuits caused by nodulation have the largest impact on the current efficiency. Therefore, to improve the current efficiency, it is important to prevent nodulation. In this research, the nodulation growth was investigated by replicating nodulation in the laboratory.
Ken Adachi +2 more
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The effect of additives on anode passivation in electrorefining of copper
Chemical Engineering and Processing: Process Intensification, 2007Abstract In copper electrorefining process, some additives are added to the electrolyte to improve the morphology of cathode deposits as well as the quality of products. In the present investigation, the effects of thiourea, glue and chloride ions (as additives) on the passivation of industrial copper anodes under high current densities have been ...
H Yoozbashizadeh
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The mineralogy of copper electrorefining
JOM, 1990The impurities in copper anodes occur both in solid solution in the copper metal matrix and in discrete inclusions at the copper grain boundaries. During electrorefining, all the impurities undergo extensive chemical and/or morphological changes. These changes impact significantly on anode passivation, cathode quality, electrolyte purification and, of ...
T. T. Chen, J. E. Dutrizac
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Additive Behavior in Copper Electrorefining
JOM, 1987This paper reports on the mode of action of two different organic additives—gelatine and thiourea—during the electrorefining of copper from acid copper sulfate solutions. Gelatine increases the cathode current efficiency and produces smoother deposits up to a certain level of concentration, beyond which, however, these effects are diminished by the ...
S. E. Afifi +2 more
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Process Optimization in Copper Electrorefining
Advanced Engineering Materials, 2004Copper is one of the major metallic materials together with steel and aluminum. At present, approx. 11 Mt of copper are produced all over the world by electrorefining in sulfuric acid electrolytes. In the last years the current density could be increased to 320–340 A/m2 by simultaneous improvement of the cathode quality, although the parameters ...
M. Stelter, H. Bombach
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Sampling of Electrorefined Copper Cathodes
Journal of Testing and Evaluation, 1980Abstract Problems involved in the sampling of electrorefined cathode production in a typical refinery are examined. Items discussed include: nonhomogeneity in single cathodes, nonhomogeneity among cathodes from the same electrolytic cell, nonhomogeneity among cathodes from single production lots, and limitations of visual examination in ...
WM Tuddenham +2 more
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New Technology for Electrorefining of Copper
JOM, 2012New electrorefining technology utilizes a novel manifold electrolyte inlet, which allows improving productivity and production in new and existing tankhouses at high current efficiency and very good cathode quality. Two installation examples—Montanwerke Brixlegg AG, Brixlegg, Austria (upgrade existing tankhouse) and Xiangguang Copper, Yanggu, China ...
Andreas Filzwieser +2 more
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Precision of Electrorefined Copper Assaying
1984A principal measure of the quality of electrorefined copper cathodes is impurity content. As such, good analytical precision is needed to identify subtle improvements in quality and to ensure that industry specifications are being satisfied. The object of this study was to determine and document the current state of refined copper analytical precision.
JC Parr, JW Braithwaite
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The direct electrorefining of copper matte
JOM, 1993Direct electrorefining of copper matte would be a desirable alternative to copper converting and its associated troublesome sulfur dioxide emissions. After more than 100 years of study, however, no commercial process has been developed, even though an analogous process for the direct electrorefining of nickel matte anodes has been operating ...
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Calorimetric studies on the electrorefining process of copper
Journal of Thermal Analysis, 1997Calorimetric measurements were carried out on the electrorefining of copper using different current densities with a Calvet type microcalorimeter at room temperature. The ratio (R) of the measured heat (Qm orWm) to the input electric energy (Qin orWin) and the excess heat (Qex orWex), i.e.
Zhongliang Zhang +5 more
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