Solid state phase transformations during the oxidation of copper sulfides: Roaster diagrams for the Cu-S-O system |
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| Institution: | 1. School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun, 130022, China;2. Research Center for Nanotechnology, Changchun University of Science and Technology, Changchun, 130022, China;3. College of Materials Science and Engineering, Jilin University, Changchun, 130022, China;1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, People''s Republic of China;2. School of Computer Science, Southwest Petroleum University, Chengdu 610500, People''s Republic of China;3. School of Oil & Natural Gas Engineering, Southwest Petroleum University, Chengdu 610500, People''s Republic of China |
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| Abstract: | Roaster diagrams that represent the stabilities of condensed phases as a function of temperature and percent oxygen appear to be more useful than the predominance area diagrams (PADs), which show the stability of different phases in the metal-sulfur-oxygen system at constant temperature. Roaster diagrams can be obtained from PADs and represent the intersection of total pressure lines with lines on a PAD extended in temperature. In this paper, PADs at four different temperatures and roaster diagrams for the system Cu-S-O are derived from PADs at total pressures of 0.25 atm and 1 atm. These diagrams show that at total pressures of 0.25 atm and 1 atm the CuO/CuO·CuSO4 phase transformation occurs at 1063 K and 1133 K at 50% oxygen. The more complex four-component system Cu-As-S-O will follow in a subsequent publications. |
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| Keywords: | Predominance area diagrams Copper Roaster diagrams Sulfide roasting |
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