Characterization of Slag‐Metal Emulsion and Its Impact on Foaming Behavior and Slopping in the LD Process

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Fältnamn	Indikatorer	Metadata
000		03548naa a2200445 4500
001		oai:DiVA.org:ltu-72759
003		SwePub
008		190201s2019 \| \|\|\|\|\|\|\|\|\|\|\|000 \|\|eng\|
024	7	a https://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-727592 URI
024	7	a https://doi.org/10.1002/srin.2018002692 DOI
040		a (SwePub)ltu
041		a engb eng
042		9 SwePub
072	7	a ref2 swepub-contenttype
072	7	a art2 swepub-publicationtype
100	1	a Brämming, Matsu Swerim AB, Luleå, Sweden4 aut
245	1 0	a Characterization of Slag‐Metal Emulsion and Its Impact on Foaming Behavior and Slopping in the LD Process
264		c 2018-12-06
264	1	b John Wiley & Sons,c 2019
338		a print2 rdacarrier
500		a Validerad;2019;Nivå 2;2019-02-06 (johcin)
520		a In the Basic Oxygen Steelmaking (BOS) process, a heterogeneous emulsion‐solid mix will form, consisting of an emulsion of liquid slag and metal droplets, in which 2nd phase particles of undissolved fluxes and solid in‐blow precipitates are suspended. When the carbon in the metal droplets reacts with iron oxide, small bubbles of CO gas are formed. If the upward movement of these bubbles is obstructed by the physical properties of the emulsion‐solid mix, foaming will occur. Certain process conditions may lead to an excessive foam growth, in the worst case forcing foam out of the vessel. This undesired process event is known as “slopping”. Extensive studies during recent decades have shown that emulsion characteristics strongly connected to foaming are: viscosity, surface tension, and density. The extent of foaming is also dependent on bubble size; foaming increasing with smaller bubble size. However, investigations into the influence of the mineralogy and morphology of the emulsion‐solid mix on foaming in basic oxygen steelmaking are scarce. In this work, samples from trials in a 6‐tonne pilot plant BOS vessel are examined by XRD and with SEM for the determination of emulsion‐solid mix mineralogy and morphology at different stages of the oxygen blow. The study confirms the importance of tight process control in order to minimize the emulsion‐solid mix apparent viscosity and, hence, the foam height, but this without over‐oxidizing the liquid slag phase, which would result in increased gas generation within the slag‐metal emulsion.
650	7	a TEKNIK OCH TEKNOLOGIERx Materialteknikx Metallurgi och metalliska material0 (SwePub)205062 hsv//swe
650	7	a ENGINEERING AND TECHNOLOGYx Materials Engineeringx Metallurgy and Metallic Materials0 (SwePub)205062 hsv//eng
653		a sic oxygen steelmaking (BOS)
653		a emulsion characterization
653		a foaming
653		a LD process
653		a mineralogy
653		a morphology
653		a slopping
653		a Process Metallurgy
653		a Processmetallurgi
700	1	a Engström, Fredriku Luleå tekniska universitet,Mineralteknik och metallurgi4 aut0 (Swepub:ltu)fren
700	1	a Samuelsson, Caisau Luleå tekniska universitet,Mineralteknik och metallurgi4 aut0 (Swepub:ltu)casa
700	1	a Björkman, Bou Luleå tekniska universitet,Mineralteknik och metallurgi4 aut0 (Swepub:ltu)bobj
710	2	a Swerim AB, Luleå, Swedenb Mineralteknik och metallurgi4 org
773	0	t Steel Research Internationald : John Wiley & Sonsg 90:2q 90:2x 1611-3683x 1869-344X
856	4 8	u https://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-72759
856	4 8	u https://doi.org/10.1002/srin.201800269

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Av författaren/redakt...: Brämming, Mats; Engström, Fredri ...; Samuelsson, Cais ...; Björkman, Bo

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