Abstract
The sulfide capacities of CaO-SiO2 melts containing CaF2 and B2O3 have been measured by simultaneous equilibration of samples within quartz capsules at 1503°C. In this method, the compositions of both the condensed phases and the static gas environment adjust to es-tablish a mutual equilibrium. Although the sulfurizing potential,P S 2/P O 2, is neither preset nor directly measured, the sulfide capacities,C s, of all samples within the capsule are related by the following equation:C S(j)=(pct S)j/(pct S)i · CS(i)· Hence, the sulfide capacities of all samples may be calculated from the measurement of the final sulfur content of each sample and the inclusion of a “reference” slag sample for which CS is known from previous measurements. In the present study, quartz capsules containing as many as fifty slag samples including several reference samples have been equilibrated. With considerable difficulty the encapsulation-equilibration method atl503°C has been developed into an acceptable procedure. The influences of CaF2 and B2O3 on the sulfide capacities of several CaO-SiO2 melts have been measured. The results may be summarized as follows: 1) for melts of fixed CaO/SiO2 ratio, the addition of CaF2 increases sulfide capacity and the addition of B2O3 decreases sulfide capacity, 2) the substitution of CaF2 for CaO does not alter sulfide capacity significantly, and 3) the substitution of B2O3 for SiO2 increases sulfide capacity slightly. These results have been obtained for melts with CaO/SiO2 mass ratios ranging from 1.00 to 1.28 and with flux additions up to 10 wt pct.
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C. J. B. Fincham and F. D. Richardson:Proc. Roy. Soc. (London), 1954, vol. A223, pp. 40–62.
G. R. St. Pierre and J. Chipman:Trans. AIME, 1956, vol. 206, pp. 1474–83.
P. T. Carter and T. C. Macfarlane:J. Iron Steel Inst., 1957, vol. 185, pp. 54–66.
K. P. Abraham, M. W. Davis and F. D. Richardson:J. Iron Steel Inst., 1960, vol. 196, pp. 309–12.
K. P. Abraham and F. D. Richardson:J. Iron Steel Inst, 1960, vol. 196, pp. 313–17.
G. J. W. Kor and F. D. Richardson:Trans. TSM-AIME, 1969, vol. 245, pp. 319–27.
R. J. Hawkins, S. G. Meherali, and M. W. Davies:J. Iron Steel Inst., 1971, vol. 209, pp. 646–57.
R. A. Sharma and F. D. Richardson:J. Iron Steel Inst., 1962, vol. 200, pp. 373–79.
R. A. Sharma and F. D. Richardson:Trans. TMS-AIME, 1965, vol. 233, pp. 1586–92.
C. Wagner:Met. Trans. B, 1975, vol. 6B, pp. 405–09.
K. L. Komarek:Metallurgical Chemistry, O. Kubaschewski, ed., pp. 75–95, National Physical Laboratory, London, 1972.
K. W. Lange and H. Schenck:Techniques of Metals Research, R. A. Rapp, ed., vol. IV, Part 1, pp. 300–02, Interscience Publishers, New York, 1970.
J. H. Norman and P. Winchell:Techniques of Metals Research, R. A. Rapp, ed., vol. IV, Part l, pp. 143–46, Interscience Publishers, New York, 1970.
E. M Levin, C. R. Robbins, H. F. McMurdie, and M. K. Reser, eds.:Phase Diagrams for Ceramists, p. 224, American Ceramic Soc, Columbus, Ohio, 1964.
J. Mukerji:J. Am. Ceram. Soc, 1965, vol. 48, pp. 210–13.
F. D. Richardson:Physical Chemistry of Melts in Metallurgy, vol. 2, p. 293, Academic Press, New York, 1974.
C. B. Alcock:Principles of Pyrometallurgy, p. 208, Academic Press, New York, 1976.
W. Eitel:Silicate Science, vol. VI, p. 85, Academic Press, New York, 1975.
G. J. Kor:Met. Trans. B, 1977, vol. 8B, pp. 107–13.
J. F. Elliott, D. C. Lynch, and T. B. Braun:Met. Trans. B, 1975, vol. 6B, pp. 495–501.
T. Forland and K. Grjotheim:Met. Trans. B, 1978, vol. 9B, pp. 45–49.
T. Forland and K. Grjotheim:Met. Trans. B, 1977, vol. 8B, pp. 645–50.
M. Blander:Met. Trans. B, 1977, vol. 8B, pp. 529–650.
F. D. Richardson:The Physical Chemistry of Melts, pp. 75–100, Institution of Mining and Metallurgy, London, 1953.
I. D. Sommerville and D. A. R. Kay:Met. Trans., 1971, vol. 2, pp. 1727–32.
D. Kumar, R. G. Ward, and D. J. Williams:Disc. Faraday Soc, 1961, vol. 32, pp. 147–54.
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Bronson, A., Pierre, G.R.S. Determination of sulfide capacities of CaO-SiO2 slags containing CaF2 and B2O3 by an encapsulation method. Metall Trans B 10, 375–380 (1979). https://doi.org/10.1007/BF02652508
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DOI: https://doi.org/10.1007/BF02652508