Premium
Study on Oxide Inclusion Dissolution in Secondary Steelmaking Slags using High Temperature Confocal Scanning Laser Microscopy
Author(s) -
Michelic Susanne,
Goriupp Jürgen,
Feichtinger Stefan,
Kang YounBae,
Bernhard Christian,
Schenk Johannes
Publication year - 2016
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201500102
Subject(s) - dissolution , slag (welding) , steelmaking , viscosity , materials science , diffusion , confocal laser scanning microscopy , inclusion (mineral) , metallurgy , oxide , optical microscope , laser microscopy , analytical chemistry (journal) , scanning electron microscope , chemistry , mineralogy , thermodynamics , confocal , composite material , chromatography , optics , medicine , physics , biomedical engineering
High temperature confocal scanning laser microscopy (HT‐CSLM) is used to study the dissolution behavior of Al 2 O 3 inclusions in various slag compositions in the system CaO‐Al 2 O 3 ‐SiO 2 ‐MgO. This method enables the in situ observation of the dissolution at steelmaking temperatures. The change of the diameter of the spherical inclusion is measured by image analysis of pictures obtained from the HT‐CSLM. Subsequently, dissolution rates and normalized dissolution curves are determined, and the governing dissolution mechanism is identified by the use of a modified approach of the diffusion equation introduced by Feichtinger et al.[27][S. Feichtinger, 2014] and compared with the dissolution of SiO 2 previously reported by the same authors.[27][S. Feichtinger, 2014] Finally, effective binary diffusion coefficients are calculated. Slag viscosity is shown to essentially affect the dissolution behavior, changing the normalized dissolution pattern from rather S‐shaped (high slag viscosity) to a parabolic form (low slag viscosity).