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On the Dissolution Behavior of Sulfur in Ternary Silicate Slags

Title
On the Dissolution Behavior of Sulfur in Ternary Silicate Slags
Authors
Kang, YBJoo Hyun Park
Date Issued
Dec-2011
Publisher
SPRINGER
Abstract
Sulfur dissolution behavior, in terms of sulfide capacity (C (S)), in ternary silicate slags (molten oxide slags composed of MO - NO - SiO(2), where M and N are Ca, Mn, Fe, and Mg), is discussed based on available experimental data. Composition dependence of the sulfur dissolution, at least in the dilute region of sulfur, may be explained by taking into account the cation-anion first-nearest-neighbor (FNN) interaction (stability of sulfide) and the cation-cation second-nearest-neighbor (SNN) interaction over O anion (oxygen proportions in silicate slags). When the Gibbs energy of a reciprocal reaction MO + NS = MS + NO is positive, the sulfide capacity of slags with virtually no SiO(2) or low SiO(2) concentration decreases as the concentration of MO increases. However, in some slags, as SiO(2) concentration increases, replacing NO by MO at a constant SiO(2) concentration may increase sulfide capacity when the basicity of NO is less than that of MO. This phenomenon is observed as rotation of iso-C (S) lines in ternary silicate slags, and it is explained by simultaneous consideration of the stability of sulfide and oxygen proportions in the silicate slags. It is suggested that a solution model for the prediction of sulfide capacity should be based on the actual dissolution mechanism of sulfur rather than on the simple empirical correlation.
URI
http://oasis.postech.ac.kr/handle/2014.oak/11656
DOI
10.1007/S11663-011-9541-2
ISSN
1073-5615
Article Type
Article
Citation
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE, vol. 42, no. 6, page. 1211 - 1217, 2011-12
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