1. Some observations and insights on BOS refining
- Author
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A Kapilashrami, M S Millman, A. Overbosch, D Malmberg, and M Brämming
- Subjects
Materials science ,business.industry ,Component (thermodynamics) ,Mechanical Engineering ,Phosphorus ,Metallurgy ,Metals and Alloys ,chemistry.chemical_element ,Slag ,Scrap ,Residence time (fluid dynamics) ,Steelmaking ,chemistry ,Mechanics of Materials ,visual_art ,Emulsion ,Materials Chemistry ,visual_art.visual_art_medium ,business ,Refining (metallurgy) - Abstract
Selected IMPHOS heats, have been used to make observations on decarburising and dephosphorising performance, scrap melting and slag foaming characteristics during BOS refining. If it is assumed that decarburisation takes place solely in the slag/metal emulsion then maximum metal residence time in the emulsion is just under 9 seconds and at peak decarburisation time, the maximum amount of metal in the emulsion is ∼50% of the total metal content in the converter. To evaluate the effects of changes in slag component chemistry on phosphorus refining it is necessary to account for changes in slag weight, which can change substantially throughout a heat and be significantly different heat-to-heat. Dephosphorising performance depends on the thermodynamic stability of slag phases that are able to take up phosphorus and the distribution of phosphorus between these thermodynamically stable phases. The application of proprietary thermodynamic models such as MTDATA and FACTSage has helped to clarify such even...
- Published
- 2013