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Estimation of escape rate of volatile components from slags containing CaF2 during viscosity measurement
Division of Theoretical Metallurgy, Department of Metallurgy, Royal Institute of Technology.
Division of Theoretical Metallurgy, Department of Metallurgy, Royal Institute of Technology.
Division of Theoretical Metallurgy, Department of Metallurgy, Royal Institute of Technology.
1999 (English)In: Steel Research International, ISSN 1611-3683, E-ISSN 1869-344X, Vol. 70, no 2, p. 53-58Article in journal (Refereed) Published
Abstract [en]

In continuous casting process, the viscosity of the mould powder/flux has direct impact on the size of the gap between the mould wall and the solidified shell, which in turn affect the heat transfer characteristics between the metal and the mould. Numerous experiments have been conducted to determine the viscosity of various mould powders using rotation cylinder method. The pre-melting of the mould powder as well as the viscosity measurement are carried out in a cylindrical crucible placed in a tubular furnace with constant argon flow to maintain inert atmosphere. One of the main difficulties encountered during viscosity measurement is the liberation of volatile fluorides, which in turn changes the flux composition, and consequently the viscosity of the flux. Thermodynamic calculations have shown that SiF4 and HF are major constituents of the volatile matter. Present study aims to estimate the liberation rate of SiF4 and HF from flux samples during viscosity measurement by computing the detailed gas flow pattern inside the tubular furnace. The gas flow pattern is computed by solving momentum and continuity of equations. Further, the effect of argon gas flow rate and slag level in the crucible on liberation rate has been studied to arrive at proper experimental conditions during viscosity measurement.

Place, publisher, year, edition, pages
1999. Vol. 70, no 2, p. 53-58
Identifiers
URN: urn:nbn:se:ltu:diva-8037Local ID: 67a49f3e-93a5-427b-98d4-4a3065ee55b9OAI: oai:DiVA.org:ltu-8037DiVA, id: diva2:980927
Note
Upprättat; 2012; 20120814 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-05-28Bibliographically approved

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Nurni, Viswanathan

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