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A new approach for the diffusion coefficient evaluation of sulfur in CaO-SiO2-Al2O3 slag
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Process Science.
2011 (English)In: 6th International Conference on Diffusion in Solids and Liquids, DSL-2010, 2011, 626-634 p.Conference paper (Refereed)
Abstract [en]

The Diffusion coefficient of sulfur in a ternary slag with composition of 51.5% CaO- 9.6% SiO2- 38.9% Al2O3 was measured at 1723 K by chemical diffusion from the variation of concentration of sulfur in silver metal. A MATLAB program was developed to find the concentration variation of sulfur in silver metal using various critical parameters like the diffusion coefficient of sulfur in slag available in literature, sulfur partition ratio, sulfide capacity of the slag and the its density. The P S2 and PO2 pressures were calculated from the Gibbs energy of the equilibrium reaction between CaO in the slag and solid CaS and confirming the same by using ThermoCalc. The density of the slag at 1723 K was obtained from earlier experiments. Initially the order of magnitude for the diffusion coefficient was taken from the works of Saito and Kawai but later was modified so that the concentration changes of Sulfur obtained from the program agreed with the experimental results. The diffusion coefficient of sulfur in 51.5% CaO- 9.6% SiO2- 38.9% Al2O3 slag at 1723 K was estimated as 4.14×10-6 cm2/sec.

Place, publisher, year, edition, pages
2011. 626-634 p.
, Defect and Diffusion Forum, ISSN 1012-0386 ; 312-315
Keyword [en]
Calcium sulfide, Diffusion coefficient, Slag, Sulfide capacity, Sulfur partition ratio, Chemical diffusion, Concentration change, Concentration variation, Critical parameter, Diffusion Coefficients, Equilibrium reactions, Gibbs energy, MATLAB program, Silver metal, Sulfur partition, Thermocalc, Aluminum, Diffusion in solids, Silicon compounds, Slags, Sulfur
National Category
Materials Chemistry
URN: urn:nbn:se:kth:diva-151224DOI: 10.4028/ 000297606300107ScopusID: 2-s2.0-79955859371ISBN: 9783037851173OAI: diva2:747746
5 July 2010 through 7 July 2010, Paris

QC 20140917

Available from: 2014-09-17 Created: 2014-09-15 Last updated: 2014-09-17Bibliographically approved

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Seetharaman, Seshadri
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