Diffusive Steel Scrap Melting in Carbon-Saturated Hot Metal—Phenomenological Investigation at the Solid–Liquid Interface
| Autor: | Michael Reischl, Florian Markus Penz, Johannes Schenk, Krzysztof Pastucha, Gerald Klösch, Rainer Ammer |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Basic oxygen steelmaking
Materials science scrap dissolution 0211 other engineering and technologies Scrap 02 engineering and technology lcsh:Technology Article basic oxygen furnace thermodynamics Impurity Mass transfer General Materials Science lcsh:Microscopy Dissolution scrap melting 021102 mining & metallurgy lcsh:QC120-168.85 lcsh:QH201-278.5 business.industry lcsh:T Metallurgy 021001 nanoscience & nanotechnology Steelmaking Coolant Forced convection steelmaking kinetics lcsh:TA1-2040 lcsh:Descriptive and experimental mechanics lcsh:Electrical engineering. Electronics. Nuclear engineering 0210 nano-technology business lcsh:Engineering (General). Civil engineering (General) lcsh:TK1-9971 |
| Zdroj: | Materials Materials; Volume 12; Issue 8; Pages: 1358 Materials, Vol 12, Iss 8, p 1358 (2019) |
| ISSN: | 1996-1944 |
| Popis: | The oxygen steelmaking process in a Linz-Donawitz (LD) converter is responsible for more than 70% of annual crude steel production. Optimization of the process control and numerical simulation of the LD converter are some of the current challenges in ferrous metallurgical research. Because of the process conditions and oxidation of impurities of the hot metal, a lot of chemical heat is generated. Therefore, steel scrap is charged as a coolant with the economical side aspect of its recycling. One of the more complex aspects is, among others, the dissolution and melting behaviour of the scrap in carbon-saturated hot metal. Heat and mass transfer act simultaneously, which has already been investigated by several researchers using different experimental approaches. The appearances at the interface between solid steel and liquid hot metal during diffusive scrap melting have been described theoretically but never investigated in detail. After an experimental investigation under natural and forced convective conditions, the samples were further investigated with optical microscopy and electron probe microanalysis (EPMA). A steep carbon concentration gradient in the liquid appeared, which started at an interface carbon concentration equal to the concentration on the solid side of the interface. Moreover, the boundary layer thickness moved towards zero, which symbolized that the boundary layer theory based on thermodynamic equilibrium was not valid. This fact was concluded through the prevailing dynamic conditions formed by natural and forced convection. |
| Databáze: | OpenAIRE |
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