Download or read book Thermodynamics of Selenium and Tellurium in Molten Metallurgical Slags and Alloys written by Murray Johnston and published by . This book was released on 2007 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: There are a number of impurity elements present in sulphide ores that can have a deleterious effect on the properties of the final copper metal product. In this thesis, an equilibrium distribution technique was used to determine the thermodynamic behaviour of selenium and tellurium in molten slags used in copper production. Calcium ferrite based slags and copper or silver alloy were equilibrated in magnesia crucibles at temperatures of 1200 to 1400 °C and oxygen partial pressures of 10-11 to 10-0.68 atm. Under conditions typical of those employed during copper converting, the minor elements were found to enter the slag as negatively charged species. The partitioning of selenium and tellurium to the slag was greatest at high temperature, low oxygen partial pressure and at highest concentration of basic oxide (CaO or BaO). The experimentally derived data were combined with published information to calculate the selenide and telluride capacities of the slag, and also to generate fundamental thermodynamic activity data for selenium and tellurium in the slag phase. It was found that the activity coefficients of selenium and tellurium were independent of their concentration in the slag over the range studied, but were strongly dependent on the temperature, slag chemistry and oxidation state of the slag. Experiments were also designed and carried out to determine what effect the presence of iron oxide and its oxidation state has on the behaviour of selenium in the slag. A series of experiments involving iron oxide additions to a calcium aluminate slag was conducted under increasingly oxidising conditions to assess the effect of total iron on the selenide capacity as the dominant oxidation state of iron in the slag changed. It was shown that at a constant ratio of CaO:Al2O3, the selenide capacity increased with total iron in the slag. However, the effect on the selenide capacity did not appear any more significant as the Fe3+:Fe2+ ratio changed in a particular direction. 4 Another series of experiments was carried out with iron calcium silicate slags to determine the stability of phases within the slag, and how this affected the equilibrium distribution and activity coefficient of selenium in the slag. A number of solid phases were identified and their composition determined by scanning electron microscopy, energy dispersive spectroscopy and electron microprobe analysis. The composition and minor element content of the remaining liquid was calculated using a thermodynamic model. From this it was found that the capacity of the liquid slag has a region of independence against slag chemistry, before increasing strongly with increasing lime content to the calcium ferrite composition. Some of the implications of this work are discussed with reference to the practicality of adjusting the process variables in a large-scale industrial process for the purpose of managing minor element content of the molten phases. Considerations include the effect on copper recovery and rate of wear of furnace refractory materials.
Download or read book Selenium and Tellurium a Materials Survey written by Arnold Marshall Lansche and published by . This book was released on 1967 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chemical Thermodynamics written by M L McGlashan and published by Royal Society of Chemistry. This book was released on 2007-10-31 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: Specialist Periodical Reports provide systematic and detailed review coverage of progress in the major areas of chemical research. Written by experts in their specialist fields the series creates a unique service for the active research chemist, supplying regular critical in-depth accounts of progress in particular areas of chemistry. For over 80 years the Royal Society of Chemistry and its predecessor, the Chemical Society, have been publishing reports charting developments in chemistry, which originally took the form of Annual Reports. However, by 1967 the whole spectrum of chemistry could no longer be contained within one volume and the series Specialist Periodical Reports was born. The Annual Reports themselves still existed but were divided into two, and subsequently three, volumes covering Inorganic, Organic and Physical Chemistry. For more general coverage of the highlights in chemistry they remain a 'must'. Since that time the SPR series has altered according to the fluctuating degree of activity in various fields of chemistry. Some titles have remained unchanged, while others have altered their emphasis along with their titles; some have been combined under a new name whereas others have had to be discontinued.
Download or read book Materials Transactions JIM written by and published by . This book was released on 1992-07 with total page 594 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book 10th International Symposium on High Temperature Metallurgical Processing written by Tao Jiang and published by Springer. This book was released on 2019-02-12 with total page 785 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years, global metallurgical industries have experienced fast and prosperous growth. High-temperature metallurgical technology is the backbone to support the technical, environmental, and economical needs for this growth. This collection features contributions covering the advancements and developments of new high-temperature metallurgical technologies and their applications to the areas of processing of minerals; extraction of metals; preparation of refractory and ceramic materials; sintering and synthesis of fine particles; treatment and recycling of slag and wastes; and saving of energy and protection of environment. The volume will have a broad impact on the academics and professionals serving the metallurgical industries around the world.
Download or read book Metals Abstracts written by and published by . This book was released on 1993 with total page 1216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Thermodynamics of Tellurium in Ferrous Alloys written by Gautam Gupta and published by . This book was released on 2003 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The objective of this project was to determine the solubility of tellurium in liquid and solid iron and iron-carbon alloys in the temperature range from 1273 K to 1673 K. The solubility of tellurium was measured in the austenite phase in solid iron, and also in iron-carbon and iron-carbon-manganese alloys in the liquid state."--Introduction, p. 2.
Download or read book Thermodynamic Properties of Inorganic Materials written by Bertrand Cheynet and published by Elsevier Publishing Company. This book was released on 1989 with total page 1648 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This book is a bibliographical database of articles on thermodynamical properties of inorganic compounds, gases, solutions, metals and alloys, published between 1970 and 1987. This reference source book compiles 25,846 references about more than 13,400 systems and should be particularly useful for people working in inorganic chemical engineering, metallurgy, and new materials processing."--Preface.
Download or read book Transactions of the American Institute of Mining Metallurgical and Petroleum Engineers written by American Institute of Mining, Metallurgical, and Petroleum Engineers and published by . This book was released on 1961 with total page 1304 pages. Available in PDF, EPUB and Kindle. Book excerpt: Some vols., 1920-1949, contain collections of papers according to subject.
Download or read book Materials Transactions written by and published by . This book was released on 1992-12 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book AusIMM Extractive Metallurgy Conference written by and published by . This book was released on 1994 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A S M Review of Metal Literature written by American Society for Metals and published by . This book was released on 1967 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Hearings written by United States. Congress. Senate. Committee on Appropriations and published by . This book was released on 1961 with total page 1744 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Chemical Thermodynamics written by and published by . This book was released on 1973 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Acta Polytechnica Scandinavica written by and published by . This book was released on 1985 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Report written by Nihon Gakujutsu Kaigi and published by . This book was released on 1951 with total page 962 pages. Available in PDF, EPUB and Kindle. Book excerpt:
