Download or read book The Effects of Addition Agents on Zinc Electrowinning from Kidd Creek Electrolyte written by D. J. MacKinnon and published by . This book was released on 1990 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: Study to determine an effective additive control strategy for the Kidd Creek zinc electrorefinery. In this phase of the study, systematic laboratory tests followed by several plant evaluations were done to determine the optimum mix of the various reagents required to maximize zinc deposition current efficiency and maintain a low deposit lead content. The individual and combined effects of antimony, sodium silicate, Dowfroth and Saponin on zinc deposition current efficiency and polarization and on the zinc deposit morphology and preferred orientation were determined in 6-h electrolysis tests conducted at 38C and 500 A/sq m current density. Platinum anodes and aluminum cathodes were used with Kidd Creek electrolyte containing 55 g/L Zn and 200 g/L H2SO. The trends identified in the 6-h experiment were confirmed in 24-h electrolysis tests employing Pb-Ag anodes with SrCO3 additions to simulate plant operating conditions.
Download or read book Proceedings of the International Symposium on Electrometallurigical Plant Practice written by P. L. Claessens and published by Elsevier. This book was released on 2013-10-22 with total page 343 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Symposium covers most of the aspects of modern aqueous electrometallurgical practice, with a stronger emphasis on copper than zinc and nickel, which can be regarded as being the three major electrolytic metals. Of the minor electrolytic metals, there are contributions describing cobalt, lead and gold electrometallurgy, as well as the production of electrolytic manganese dioxide. The sessions divide neatly into modern copper tankhouse practice, purification techniques, modernization and automation, and new developments. A cross section of worldwide practice is represented, with a perhaps understandable concentration of Canadian operations. Plant tours to a modern zinc electrowinning operation, CEZ Inc at Valleyfield, and one of the world's largest copper refineries, Noranda Minerals, Inc., CCR Division in Montreal East, have been included as an integral part of the Symposium.
Download or read book CANMET Catalogue of Publications written by Canada Centre for Mineral and Energy Technology and published by . This book was released on 1990 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Investigation of the Effects of Addition Compounds on the Electrolysis of Zinc written by Louis H Peterson and published by . This book was released on 1951 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Study of the Effects of Certain Addition Agents in the Electrodeposition of Zinc written by James S Wood and published by . This book was released on 1950 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book CIM Bulletin written by Canadian Institute of Mining and Metallurgy and published by . This book was released on 1990 with total page 788 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book CANMET Special Publication written by and published by . This book was released on 1990 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Government Reports Announcements Index written by and published by . This book was released on 1991 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Metals Minerals Annual Review written by and published by . This book was released on 1998 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government reports annual index written by and published by . This book was released on 199? with total page 1646 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Microlog Canadian Research Index written by and published by . This book was released on 1990 with total page 1222 pages. Available in PDF, EPUB and Kindle. Book excerpt: An indexing, abstracting and document delivery service that covers current Canadian report literature of reference value from government and institutional sources.
Download or read book Hydrometallurgy V written by Courtney Young and published by Minerals, Metals, & Materials Society. This book was released on 2003 with total page 998 pages. Available in PDF, EPUB and Kindle. Book excerpt: This collection of papers documents presentations from an influential forum for industry, government, academic and administrative personnel interested in all facets of hydrometallurgy and its application to metal recovery and water purification.
Download or read book Process and Chemical Engineering written by and published by . This book was released on 2001 with total page 630 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Copper Leaching Solvent Extraction and Electrowinning Technology written by Gerald V. Jergensen and published by SME. This book was released on 1999 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume recognizes the growing role of solvent extraction and electrowinning technology in the world copper business. This well-established, remarkable hydrometallurgical achievement fills an important role in our technical ability to extract copper in an efficient and cost-effective way. This proceedings documents the present status of the SX-EW business. It represents a substantial body of historical, scientific, engineering, and commercial information regarding the growth and application of the technology.
Download or read book Extractive Metallurgy of Copper written by Anil Kumar Biswas and published by Oxford ; Toronto : Pergamon. This book was released on 1980 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mineral Facts and Problems written by and published by . This book was released on 1956 with total page 1054 pages. Available in PDF, EPUB and Kindle. Book excerpt:
