Results 131 to 140 of about 318 (175)

Additive Behavior in Copper Electrorefining

JOM, 1987
This 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, A. A. Elsayed, A. E. Elsherief   +2 more
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Developments in Alkaline Tin Electrorefining

JOM, 1988
Although alkaline stannate baths for electrorefining of tin have been used for some time, there is still room for improvement The effects of alkali concentration, current density and temperature on the cathodic current efficiency have been studied, and a bath temperature of 75°C is recommended.
A. E. Saba, S. E. Afifi, A. E. El Sherief   +2 more
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Studies on electrorefining of calciothermic hafnium

Journal of Nuclear Materials, 1978
Abstract The paper deals with a fused salt electrorefming process to produce pure hafnium metal starting from its calciothermically reduced intermediate. The electrolyte, NaCl-NaF-HfCl 4 , has been developed for its suitability for running hafnium electrorefining.
I.G. Sharma, C.K. Gupta
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Direct electrorefining of nickel matte

JOM, 1958
International Nickel Company has unveiled a new electrorefining process which recovers high purity sulfur, selenium, and cobalt.
L. S. Renzoni, R. C. McQuire, W. V. Barker   +2 more
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Precision of Electrorefined Copper Assaying

1984
A 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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Process Optimization in Copper Electrorefining

Advanced Engineering Materials, 2004
Copper 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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Electrorefining and Electrodeposition of Metals

1985
Copper is found in nature as the metal and in various types of ore such as oxide, hydroxide, carbonate, sulfide, and in mixtures and double salts of these compounds. Of these, the sulfide ore, chalcopyrite Cu2S • FeS • FeS2, is commonly used in Japan. Figure 10.1 illustrates an example of the flowsheet for copper concentrate processing.
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Fused Salt Electrorefining of Beryllium

JOM, 1960
The US Bureau of Mines has achieved laudable progress in its striving to attain high-purity beryllium. The following is a discussion of the Bureau’s work on the fused salt electrorefining of beryllium.
M. M. Wong, R. E. Campbell, D. H. Baker
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Sampling of Electrorefined Copper Cathodes

Journal of Testing and Evaluation, 1980
Abstract 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, AD Dangerfield, BB McMillan   +2 more
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The direct electrorefining of copper matte

JOM, 1993
Direct 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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