Download or read book Fundamental Study of the Role of Cathode Structure on Zinc Electrowinning written by Horacio M. Aros and published by . This book was released on 1987 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The influence of cathode macromorphology on the current efficiency of zinc electrowinning was determined. The studies have shown that surface roughness affects current efficiency during zinc electrowinning, particularly when the electrolyte contains impurities such as nickel and antimony. Current efficiency does not change with surface roughness as long as the electrolyte is sufficiently pure. Zinc deposited on smooth zinc cathodes tends to retain a more favorable structure and macromorphology, which is less sensitive to the effects caused by antimony and nickel. Glue helps to counteract the effect of the impurities; however, its presence in the electrolyte at certain combinations with other additives produces an increase in surface roughness and a dramatic decrease in current efficiency. A definite relationship was observed between the data obtained by cyclic voltammetry and the long time current efficiency tests. A statistical screening design program was conducted to determine the individual effects and interactions of temperature (35-45°C), antimony (0.02-0.06 mg/l), nickel (1-5 mg/l), glue (5-15 mg/l) and acid concentrations (175-225 g/l) on current efficiency. The results show that smooth zinc cathodes are less susceptible to impurity attack while rough deposits give consistently lower current efficiencies than smooth zinc. Under certain conditions, glue proved to be an important factor in influencing roughness evolution. The influence of cathode current distribution on current efficiency was also investigated. The effect of current density (up to 50 mA/cm2) and sulfuric acid concentration (150-250 g/l) on current efficiency was determined. The results show that low current densities (up to 10 mA/cm2) cause an increase in hydrogen evolution and an eventual dissolution of the zinc deposits. At the same operating conditions of current efficiency tests (12 hour deposition time), cyclic voltammetry tests show that the current rise measurements present a good correlation with current efficiency. Electrolytes containing antimony and glue show that, at low current densities, glue does not completely counteract the effect that antimony and high acid concentrations have on current efficiency. A proper chemical balance of the electrolyte was very critical. The experimental results have shown that surface macromorphology of the electrode was an important factor to be considered in the evaluating the efficiency of zinc electrowinning. In addition, surface macromorphology plays an important role in the interpretation of the impurity effects"--Abstract, leaves iii-iv
Download or read book Zinc Electrowinning written by Roberto C. Villas-Bôas and published by CYTED-CETEM. This book was released on with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive study on zinc electrowinning and the fundamentals and practices of the same, under the influence of several important industrial variables and impurities associated with the leached concentrate.
Download or read book Metals Abstracts written by and published by . This book was released on 1995 with total page 1192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book American Doctoral Dissertations written by and published by . This book was released on 1987 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Index to American Doctoral Dissertations written by and published by . This book was released on 1989 with total page 1252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bulletin written by United States. Bureau of Mines and published by . This book was released on 1985 with total page 972 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book CFD Modeling and Simulation in Materials Processing 2016 written by Lifeng Zhang and published by John Wiley & Sons. This book was released on 2016-02-08 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: This collection explores computational fluid dynamics (CFD) modeling and simulation of engineering processes, with contributions from researchers and engineers involved in the modeling of multiscale and multiphase phenomena in material processing systems. The papers cover the following processes: Iron and Steelmaking (Tundish, Casting, Converter, Blast Furnace); Microstructure Evolution; Casting with External Field Interaction; and Smelting, Degassing, Ladle Processing, Mechanical Mixing, and Ingot Casting. The collection also covers applications of CFD to engineering processes, and demonstrates how CFD can help scientists and engineers to better understand the fundamentals of engineering processes.
Download or read book List of Bureau of Mines Publications and Articles with Subject and Author Index written by United States. Bureau of Mines and published by . This book was released on 1992 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Industrial Electrochemistry written by D. Pletcher and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 669 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this second edition remains the discussion of the many diverse roles of electrochemical technology in industry. Throughout the book, the intention is to emphasize that the applications, though extremely diverse, all are on the same principles of electrochemistry and electrochemical engineer based ing. Those familiar with the first edition will note a significant increase in the number of pages. The most obvious addition is the separate chapter on electrochemical sensors but, in fact, all chapters have been reviewed thoroughly and many have been altered substantially. These changes to the book partly reflect the different view of a second author as well as comments from students and friends. Also, they arise inevitably from the vitality and strength of electrochemical technology; in addition to important improvements in tech nology, new electrolytic processes and electrochemical devices continue to be reported. In the preface to the first edition it was stated: . . . the future for electrochemical technology is bright and there is a general expectation that new applications of electrochemistry will become economic as the world responds to the challenge of more expensive energy, of the need to develop new materials and to exploit different chemical feedstocks and of the necessity to protect the environment. The preparation of this second edition, seven years after these words were written, provided an occasion to review the progress of industrial electro chemistry.
Download or read book Metals Abstracts Index written by and published by . This book was released on 1996 with total page 1622 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lead Zinc 2000 written by J. E. Dutrizac and published by John Wiley & Sons. This book was released on 2013-09-12 with total page 1071 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Lead-Zinc 2000 Symposium is the fourth in the series of decennial conferences on the processing of lead and zinc; it isorganized by the Minerals, Metals and MaterialsSociety (TMS). The Symposium the culmination of over two years of work that included the preparation of the papers by the authors, as well as the refereeing, proof-reading and indexing by the editors. The proceedings volume contains sixty-four papers which cover all aspects of lead and zinc processing, including the global business trends of the metals, plant operations, new processing installations, emerging technologies and environmental considerations. The Lead-Zinc 2000 Symposium will also honor Dr. T.R.A. Davey for his many contributions to metallurgical science and the industry throughout his distinguished career.
Download or read book Techniques of Metals Research Techniques for the direct observation of structure and imperfections Editor R F Bunshah 2 v written by Rointan Framroze Bunshah and published by . This book was released on 1968 with total page 872 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Journal of Scientific and Industrial Research written by and published by . This book was released on 1990 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Electrometallurgy 2012 written by Michael L. Free and published by John Wiley & Sons. This book was released on 2012-05-09 with total page 273 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of a symposium sponsored by The Metallurgy and Materials Society of CIM and the Hydrometallurgy and Electrometallurgy Committee of the Extraction and Processing Division of TMS (The Minerals, Metals & Materials Society) Held during the TMS 2012 Annual Meeting & Exhibition Orlando, Florida, USA, March 11-15, 2012
Download or read book CIM Bulletin written by Canadian Institute of Mining and Metallurgy and published by . This book was released on 2003 with total page 994 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the 5th International Symposium Honoring Professor Ian M Ritchie written by Courtney Young and published by John Wiley & Sons. This book was released on 2013-09-19 with total page 1061 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sponsored by The Extraction and Processing Division (EPD) of TMS, The Mineral and Metallurgical Processing Division (MPD) of SME, Metallurgical Society (MetSoc) of CIM 2003 TMS/EPD Fall Meeting held in conjunction with 33rd Annual Hydrometallurgy Meeting and 2003 Conference of Metallurgists Vancouver BC Canada August 24-27,2003.
Download or read book An Introductory Guide to EC Competition Law and Practice written by Valentine Korah and published by . This book was released on 1994 with total page 2354 pages. Available in PDF, EPUB and Kindle. Book excerpt:
