The Ability of Slags to Absorb Solid Oxide Inclusions
By M. Valdez, G. Shannon, S. Sridhar. 2006
137 citations recorded by the source corpus.
The capture rate of solid oxide-inclusion particles from molten steel by molten slag depends on the rate of steel film drainage (which occurs at certain particle velocities), interfacial separation, and dissolution into the slag. In this study the capture of common oxide inclusions of sizes 2.5–200 µm and with velocities ranging from their terminal velocities to 0.3 m·s−1 approaching the interface between molten iron and slags with chemistries corresponding to ladle, tundish and mold slags are investigated. Calculations, based on a model available in literature, show that film drainage (when applicable) is rapid enough to be ignored. A sensitivity analysis based on the slag properties show that the interfacial energy between slag and inclusion is the most pertinent property that could hinder interfacial separation. However, the interfacial tension needed to achieve this has to be a minimum of 0.41 N/m which is unreasonable for the case of common oxide inclusions such as Al2O3, MgO, ZrO2 and MgAl2O4. The final step of dissolution was found based on studies with Confocal Scanning Laser Microscope experiments, to be significantly slower than the other steps. For a 100 µm particle, in the slags/inclusions investigated a correlation between slag viscosity, η [Pa·s] and super saturation, ΔC [kg·m2−3] with inclusion dissolution time, τ [s] was shown to be, τ=2.04·10−2/(C/η).
Subfields: Mechanical Engineering, Ocean Engineering, Water Science and Technology
View Paper: https://www.semanticscholar.org/paper/87bca71801dc866f9146c507ebad2bf48973d283
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In Mechanical Engineering
In Water Science and Technology
Citations in the corpus
- Non-metallic inclusions in steels – origin and control (2018, background): “More recently Sridhar and co-workers [81,82,84,85] have concluded that their in situ observations indicated film drainage to be a pervasive phenomenon, delaying the passage of inclusions to the slag in most cases.”