Results 131 to 140 of about 371 (178)
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Electrowinning of gold from anode slimes
Materials Chemistry and Physics, 1996Abstract An electrowinning process using air agitation in an acid electrolyte is described for the recovery of gold at 25 °C from anode slimes of the Wohlwill electrorefming cell. The degree of purification of gold improved from 93.4% to over 99%. The rate of gold dissolution is estimated to be 2.2 g A −1 per h at 80 mA cm −2 and 3 V.
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A Study on Recovery of Gold from Decopperized Anode Slime
Chemical Engineering & Technology, 2001A study was performed on the chlorination and cementation of gold from an anode slime. The gold from decopperized anode slime first was dissolved with chlorine gas in aqueous medium, later the dissolved gold was precipitated by using a rotational copper disc.
Çolak, Sabri +2 more
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Electrometallurgy of copper refinery anode slimes
Metallurgical Transactions B, 1990High-selenium copper refinery anode slimes form two separate and dynamically evolving series of compounds with increasing electrolysis time. In one, silver is progressively added to non-stoichiometric copper selenides, both those originally present in the anode and those formed subsequently in the slime layer, and in the other, silver-poor copper ...
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Identification of arsenato antimonates in copper anode slimes
Hydrometallurgy, 2006Abstract It was found that, in copper electrolyte, the combination of As(V) and Sb(V) can form arsenato antimonic acid (AAAc) and, the reactions of AAAc with As(III), Sb(III), and Bi(III) can produce the precipitates of arsenato antimonates. During copper electrorefining, the As, Sb, and Bi deposited into the anode slime from the electrolyte are ...
Wang Xue-Wen +3 more
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Tellurium distribution in copper anode slimes smelting
Metallurgical and Materials Transactions B, 1998Tellurium is a common minor constituent of copper anode slimes. The distribution of tellurium between the phases during slimes smelting is an important consideration, both in terms of metal quality and the capture of the oxidized tellurium. In this work, the oxidation by oxygen at 1100 °C of a silver-copper selenide matte containing 2 pct tellurium has
D. R. Swinbourne +2 more
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Recovery of selenium from copper anode slimes
Metallurgical Transactions, 1971Thermogravimetric studies were made on thin layers and spherical pellets of decopperized anode slimes. These have shown that deselenization proceeds initially by the volatilization of the free selenium content at about 360°C. At higher temperatures and under an oxidizing atmosphere, silver selenide is decomposed either directly or via the formation of ...
W. A. Dutton +2 more
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The treatment of copper refinery anode slimes
JOM, 1990There are numerous viable approaches to the treatment of anode slimes from electrolytic copper refining. Of particular interest in the treatment of slimes are the behavior and recovery of selenium. The understanding of the process chemistry involved in the treatment of anode slimes should be aided considerably by recent work on the formation and ...
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Adhesion of anode slime on anode surface in electrolytic refining of lead
Metallurgical Transactions B, 1977In the Betts process for electrolytic refining of lead, adhesion of anode slime onto anode surface is practically very important. This investigation was undertaken to reveal dominant factors governing adhesiveness of the anode slime. The results are summarized as follows: the adhesiveness depends considerably upon the form and the physical state of ...
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A study of anodic slime behaviour in the electrorefining of copper
Hydrometallurgy, 1995Abstract The kinetics of anode slime formation and propagation were studied in a laboratory-scale copper electrorefining apparatus. Laser-based illumination and digital image processing of videotaped records of slime movement, combined with current/time monitoring and polarization experiments, provide quantitative information about the complex ...
Z.H. Gu, J. Chen, T.Z. Fahidy
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Processing of copper anodic-slimes for extraction of valuable metals
Waste Management, 2003This work focuses on processing of anodic slimes obtained from an Egyptian copper electrorefining plant. The anodic slimes are characterized by high concentrations of copper, lead, tin and silver. The proposed hydrometallurgical process consists of two leaching stages for the extraction of copper (H(2)SO(4)-O(2)) and silver (thiourea-Fe3+), and ...
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