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Dissolution kinetics of alumina in molten CaO–Al 2 O 3 –Fe t O–MgO–SiO 2 oxide representing the RH slag in steelmaking process
Author(s) -
Park YoungJoon,
Cho YongMin,
Cha WooYeol,
Kang YounBae
Publication year - 2020
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16879
Subject(s) - dissolution , slag (welding) , crucible (geodemography) , materials science , oxide , kinetics , metallurgy , saturation (graph theory) , mineralogy , solubility , analytical chemistry (journal) , chemistry , chromatography , physics , quantum mechanics , computational chemistry , mathematics , combinatorics
Abstract In order to effectively remove alumina inclusions suspending in ultra‐low C steel during RH process, the dissolution kinetics of alumina in molten CaO–Al 2 O 3 –Fe t O–MgO–SiO 2 oxide was investigated. A crucible dissolution technique was used where the alumina crucible was allowed to dissolve in the slag of various conditions ((% CaO)/(% Al 2 O 3 ), (% Fe t O), temperature). The obtained data were interpreted using a kinetic mass transport equation to obtain the mass transport coefficient ( k m ) in each condition. Increasing (% CaO)/(% Al 2 O 3 ), (% Fe t O), and temperature increased the dissolution rate as well as the k m provided that the slag composition is not close to its saturation composition by alumina. In order to simulate the dissolution of alumina inclusion in the RH slag, which cannot be measured by a confocal scanning laser microscopy (CSLM) at present due to the opaqueness of the slag, the modified invariant interface approximation was employed. Along with the obtained k m , the viscosity of slag, and a reference experiment using the CSLM, the dissolution kinetics of alumina inclusion in the Fe t O‐containing RH slag was predicted. The time required for the dissolution of alumina inclusions from liquid steel to RH slag was discussed.