Impact of sulfur loss on activity coefficient measurements of trace elements in matte
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[11]
Eq. [10] would give the dashed curve for ka/ka,S shown in Figure 3. This gives a closer fit than the straight line with the experimental data, and extrapolation of the value of KS to 2 mol pct S would bring the results of the two kinetic studies into reasonable agreement. Clearly, the experimental precision is insufficient for other than a tentative conclusion that the simple site blockage model with composition-independent values for the adsorption coefficients is very much a first-order approximation for this system. Measurements of steady-state oxygen concentrations in liquid copper under flowing CO2-H2 mixtures have been shown[13] to be consistent with significant deviations from ideal adsorption behavior for oxygen. Gallois and Lupis[14] have also concluded from surface tension studies that there are attractive interactions among adsorbed oxygen atoms, leading to negative deviations from ideal adsorption. No additional information is available on the adsorption behavior of sulfur on liquid copper.
REFERENCES 1. S. Sun and G.R. Belton: Mineral Processing Extr. Metall. Rev., 1992, vol. 10, pp. 291-305. 2. A.W. Cramb, W.R. Graham, and G.R. Belton: Metall. Trans. B, 1978, vol. 9B, pp. 623-29. 3. K. Sano and H. Sakao: J. Jpn. Inst. Met., 1955, vol. 19, pp. 655-59. 4. G.K. Sigworth and J.F. Elliott: Can. Met. Q., 1974, vol. 13, pp. 455-61. 5. P.T. Morland, S.P. Mathew, and P.C. Hayes: Metall. Trans. B, 1991, vol. 22B, pp. 211-17. 6. L.S. Darken and E.T. Turkdogan: in Heterogeneous Kinetics at Elevated Temperatures, G.R. Belton and W.L. Worrell, eds., Plenum Press, New York, NY, 1970, pp. 25-95. 7. G.R. Belton: Metall. Trans. B, 1976, vol. 7B, pp. 35-42. 8. K. Monma and H. Suto: J. Jpn. Inst. Met., 1960, vol. 24, pp. 374-77. 9. C.F. Baes and H.H. Kellogg: Trans. AIME, 1953, vol. 197, pp. 643-48. 10. P. Sahoo, T. Debroy, and M.J. McNallan: Metall. Trans. B, 1988, vol. 19B, pp. 483-91. 11. G.R. Belton: Metall. Trans. B, 1993, vol. 24B, pp. 241-58. 12. C.F. Acton and G.R. Belton: Metall. Trans. B, 1976, vol. 7B, pp. 69397. 13. Y. Sasaki and G.R. Belton: Metall. Trans. B, 1980, vol. 11B, pp. 22124. 14. B. Gallois and C.H.P. Lupis: Metall. Trans. B, 1981, vol. 12B, pp. 54957.
Impact of Sulfur Loss on Activity Coefficient Measurements of Trace Elements in Matte TOM ZHONG and DAVID C. LYNCH The influence of sulfur loss on activity coefficient measurements of trace elements is investigated. Roine and Jal-
TOM ZHONG, Senior Staff Process Engineer, is with the Silicon Valley Group, Inc., San Jose, CA 95131-1284. DAVID C. LYNCH, Professor and Associate Head, is with the Department of Materials Science and Engineering, University of Arizona, Tucson, AZ 85721. Manuscript submitted June 10, 1997. 298—VOLUME 29B, FEBRUARY 1998
Fig. 1—Impact of sulfur content in Cu-Fe mattes on partial pressure of S2.[1]
Table I.
Linear Regression Constants for the Lines in Figure 1
Cu/Fe
C1
C2
` 25 2.5 1
276.6 281.4 276.6 260.5
218 225 175 132
kanen[1] employed an elegant transpiration technique using quantitative chemical analys
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