Direct observation of spontaneous emulsification and associated interfacial phenomena at the slag–steel interface
1998; Royal Society; Volume: 356; Issue: 1739 Linguagem: Inglês
10.1098/rsta.1998.0202
ISSN1471-2962
Autores Tópico(s)Fluid Dynamics and Heat Transfer
ResumoRestricted accessMoreSectionsView PDF ToolsAdd to favoritesDownload CitationsTrack Citations ShareShare onFacebookTwitterLinked InRedditEmail Cite this article 1998Direct observation of spontaneous emulsification and associated interfacial phenomena at the slag–steel interfacePhil. Trans. R. Soc. A.356981–993http://doi.org/10.1098/rsta.1998.0202SectionRestricted accessDirect observation of spontaneous emulsification and associated interfacial phenomena at the slag–steel interface Published:15 April 1998https://doi.org/10.1098/rsta.1998.0202AbstractInterfacial tension decreases drastically when an intense chemical reaction occurs at a steel–slag interface. This phenomenon results in spontaneous droplet spreading during the initial period of reaction and droplet recovery as the rate of reaction decreases. In the present work, spreading tendency was found to be associated with spontaneous emulsification of both steel in slag and slag in steel. Spontaneous emulsification was observed at 1550°C when a liquid Fe–3.28%Al alloy droplet was placed in contact with liquid CaO–SiO2–Al2O3 (40:40:20 by weight) slag.Surface turbulence induced metal emulsification and droplet spreading was observed by X–ray photography. Spontaneous droplet spreading was noted at alloy aluminium contents as low as 0.25%. Spontaneous emulsification was steel into slag was documented at aluminium contents greater than 3%. From the observation of quenched Fe–3.28%Al alloy droplets by optical and scanning electron microscopy, slag entrapment and metal emulsification were documented and the metal–slag interface was shown to be extremely perturbed during the reaction of aluminium with silica. 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López-Montilla J, Herrera-Morales P, Pandey S and Shah D (2002) Spontaneous Emulsification: Mechanisms, Physicochemical Aspects, Modeling, and Applications, Journal of Dispersion Science and Technology, 10.1080/01932690208984202, 23:1-3, (219-268), Online publication date: 1-Jan-2002. Chevalier Y, Chivé A, Delfort B, Born M, Barré L and Gallo R The emulsification of inorganic colloidal particles in an organic medium Trends in Colloid and Interface Science XIV, 10.1007/3-540-46545-6_21, (100-105) Chatain D, Wynblatt P, de Ruijter M, De Conninck J and Carter C (1999) The shape of two-phase drops in the presence of perfect wetting, Acta Materialia, 10.1016/S1359-6454(99)00136-6, 47:10, (3049-3056), Online publication date: 1-Aug-1999. This Issue15 April 1998Volume 356Issue 1739Discussion Meeting Issue 'Marangoni and interfacial phenomena in materials processing' organized by E. D. Hondros, M. McLean and K. C. Mills Article InformationDOI:https://doi.org/10.1098/rsta.1998.0202Published by:Royal SocietyPrint ISSN:1364-503XOnline ISSN:1471-2962History: Published online15/04/1998Published in print15/04/1998 License: Citations and impact KeywordsX–ray photographycastingsteel–slag interfaceinterfacial tensionspontaneous emulsification
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