Copper electrolysis

Fujimura and A. Katai, Selenium Recovery from Copper Electrolysis Slimes at Mitsubishi Osaka Refinery, paper no. 82-12, TMS, Warrendale, Pa. 

L. A. Soshrukova and M. M. Kupchenko, Pererahotka Mednelektrolitnykh Shlamov ([Treatment of Copper Electrolysis Slimes), Metallurgiya, Moscow, 1978. 

Selenides and tellurides Anodic slimes from copper electrolysis... 

In copper electrolysis, there are only a very limited number of impurities that will cause a current efficiency decrease, and these occur particularly in electrowinning. One troublesome impurity is iron, as the ferric ion is preferentially reduced at the cathode to ferrous ion. The ferrous ion is subsequently reoxidized at the anode. The actual current efficiency obtained is dependent on the iron concentration. (8 ) For example, an electrolyte containing 10 gpl iron gives a 77% current efficiency, but with 1 gpl, a 90% value can be obtained. 

The influence of antimony at a level of 300 ppm in copper electrolysis is also significant. The morphologies of deposits made from a pure acid-copper sulfate electrolyte and from an identical solution to which the antimony was added are shown in Figures 5 and 6. There are many other combinations of impurities and electrolytes which exhibit this changing surface appearance and deposit orientation besides those selected as examples. Anion effects are also not uncommon, with the halogens often causing the more notable changes. 

As might now be expected, certain similar occurrences are present in copper electrolysis. Table IV lists the concentration of antimony analyzed in the copper cathode when various levels of the additives were in the electrolyte. The data indicate a critical concentration of antimony in solution is necessary (approximately 300 ppm) before appreciable amounts are taken into the cathode. Glue does not alter the results for 600 ppm antimony but chloride ion reduces the effective antimony to 200 ppm or less. 

Intermolecular coupling Many papers on hydrodimerization of aromatic carbonyl compounds have appeared indicating the importance of this reaction. The rac/meso ratio for the pinacolization of acetophenone in aqueous ethanol ranges between 0.9 and 1.4 in acidic medium and between 2.5 and 3.2 in basic medium. The diastereoselectivity is independent of the cathode material mercury, tin, or copper. Electrolysis conditions such as current density, potential, or current-controlled electrolysis also do not influence the diastereoselectivity. The same holds for propiophenone. For benzaldehyde, the rac/meso ratio is 1.1 to 1.2 in acidic as well as in basic media [283]. In the presence... 

Through the marketing of mechanization facilities, MESCO, jointly with Marubeni Corporation, was awarded a contract for the construction of the PASAR Copper Smelter and Refinery (production capacity 138,000 t/y) in the Philippines in 1980 and the construction was completed in 1984. This project was successfully completed within the scheduled time and with satisfactory operational results. This success became a milestone for MESCO to promote an active copper business in overseas countries. Utilizing our own technology for the mechanization of copper smelting plants and with the collaboration of Copper Refinery Ltd. (CRL) of Australia, MESCO has supplied technology and constructed plants for copper electrolysis in foreign countries. 

MESCO supplied stripping machines for the original ISA Process and has been contributing to the development of the ISA Process. In addition to mechanical technologies, MESCO has supplied the overall electrolysis technology based on the ISA Process. To mention some, MESCO supplied the basic and detailed engineering for a 200,000 tonnes per year copper electrolysis plant in Indonesia, and Carried out the basic engineering for a copper electrolysis plant in Australia. 

As an application example, in the field of magnetohydrodynamics, the profile sensor measured the temporal evolution of the velocity field near the electrode at a copper electrolysis experiment under the influence of a magnetic field in order to study the interaction between Lorentz force and buoyancy-driven convection [6]. 

I.S. Laitenen, Modelling, Simulation and Optimization of Copper Electrolysis Cell Group (Thesis, Tampere University of Technology, 2009), 10-13. 

From the copper and nickel ore concentrates platinum metals are collected in the anode sHme from the copper electrolysis or in a residue after the nickel matte treatment with CO in the MONO process. This residue and the anode slime are worked up in a noble metal refinery. 

If a current of 0.123 amps is passed through a copper electrolysis cell for one hour, how much copper will deposit ... 

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