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    Thermodynamics of trace elements As, Bi, Pb, and Sb in copper-iron and nickel-copper matte

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    Author
    Zhong, Xu, 1966-
    Issue Date
    1996
    Keywords
    Engineering, Materials Science.
    Advisor
    Lynch, David C.
    
    Metadata
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    Publisher
    The University of Arizona.
    Rights
    Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
    Abstract
    A transportation method was used to evaluate the activity coefficients of the minor elements, As, Bi, Pb, and Sb, in both Cu - Fe and Ni - Cu mattes, white metal, and molten Ni₃S₂ as a function of their concentration. Values for the activity coefficients are compared to values obtained by other investigators. With the Cu - Fe mattes and white metal, the analysis was conducted at Cu/Fe molar ratio between 1 to ∞, at sulfur deficiencies from -0.02 to +0.02, and at temperatures between 1493 and 1573 K. Activities of As and Sb in the melts are both concentration dependent at weight percents less than 0.3. No such dependency is observed for Bi or Pb. First and second order self interaction parameters are also reported for As and Sb in Cu - Fe matte. With the Ni-Cu mattes only the sulfur deficiency and the Ni/Cu molar ratio were varied. The experiments were conducted at 1473 K at Ni/Cu molar ratios of ∞, 2, and 1, and at SD values from 0 to -0.1. As and Sb are substantially more stable in Ni - Cu mattes than in Cu - Fe mattes, while for Pb and Bi the presence of Ni does not change the activity of Pb and Bi significantly. The Henrian activity coefficients of these minor elements in both Cu - Fe and Ni - Cu mattes are reported. (Abstract shortened by UMI.)
    Type
    text
    Dissertation-Reproduction (electronic)
    Degree Name
    Ph.D.
    Degree Level
    doctoral
    Degree Program
    Graduate College
    Materials Science and Engineering
    Degree Grantor
    University of Arizona
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