Identification of Rate, Extent, and Mechanisms of Hot Metal Resulfurization with CaO-SiO2-Na2O Slag Systems
| Autor: | Ville-Valtteri Visuri, Timo Fabritius, Timo Paananen, Tero Vuolio |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
chemistry.chemical_classification Materials science Structural material Sulfide Thermodynamic equilibrium Kinetics 0211 other engineering and technologies Metals and Alloys Thermodynamics chemistry.chemical_element Slag 02 engineering and technology Condensed Matter Physics 01 natural sciences Sulfur Metal chemistry Mechanics of Materials visual_art Phase (matter) 0103 physical sciences Materials Chemistry visual_art.visual_art_medium 021102 mining & metallurgy |
| Zdroj: | Metallurgical and Materials Transactions B. 50:1791-1807 |
| ISSN: | 1543-1916 1073-5615 |
| Popis: | The resulfurization of hot metal has not been comprehensively studied in literature. This study presents an experimental and mathematical modeling study of resulfurization in thermodynamic and kinetic point of view. The rate, extent, and mechanisms of resulfurization were evaluated by analyzing concurrently the physical properties and sulfur-extracting ability of the slag. Experiments were conducted in a chamber furnace in an argon atmosphere, and the hot metal was sampled with pre-defined basis. The experiments were continued until the metal–slag system reached an apparent thermodynamic equilibrium. To obtain a quantitative measure on the effect of system properties on the rate and extent of resulfurization, the results of this study were combined with previous studies handling the sulfide capacities of Na2O-SiO2 and CaO-SiO2-Na2O slag systems. The sulfide capacities of the slag and corresponding metal–slag sulfur partition ratios were mathematically modeled with data-driven techniques such as multiple linear and non-linear regression and artificial neural networks. Finally, with the help of these, to study the kinetics of resulfurization, a simple mechanistic reaction model was derived. The results suggest that resulfurization of hot metal follows 1st-order kinetics and that the rate and extent can be regulated through the control of the associated thermodynamic driving force and by modifying the physical properties of the slag. The rate-limiting factor was found to be determined by the morphology of the slag phase. |
| Databáze: | OpenAIRE |
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