An application of infrared analysis to determine the mineralogical phases formation in fluxes for thin slab casting of steel

. Fluorite (CaF 2) is an important component in casting powders for steel production. When casting powders are heated the constituents react to form mainly cuspidine (Ca 4Si 2O 7F 2) which promotes an adequate solidification for the medium carbon and peritectic grade steel. [Display omitted] ► Comme...

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Bibliographic Details
Published in:Journal of fluorine chemistry 2011-05, Vol.132 (5), p.323-326
Main Authors: Cruz-Ramírez, Alejandro, Romo-Castañeda, Julio, Hernández-Pérez, María de los Ángeles, Vargas-Ramírez, Marissa, Romero-Serrano, Antonio, Hallen-López, Manuel
Format: Article
Language:English
Subjects:
Cooling
Cuspidine
Diffraction
Flux
Fluxes
Heat treatment
Mineralogical phases
Nepheline
Phases
Slab casting
Structural steels
X-rays
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Summary:. Fluorite (CaF 2) is an important component in casting powders for steel production. When casting powders are heated the constituents react to form mainly cuspidine (Ca 4Si 2O 7F 2) which promotes an adequate solidification for the medium carbon and peritectic grade steel. [Display omitted] ► Commercial fluxes are constituted by minerals. ► Cuspidine (3CaO·2SiO 2·CaF 2) phase is obtained when flux are heated. ► The cuspidine spectrum was obtained with FTIR and XRD techniques. ► The FTIR is proposed as a complementary technique to study the fluxes structure. The Fourier Transformed Infrared (FTIR) spectra analysis of two fluxes used in the thin slab casting process of steel were carried out in order to identify the mineralogical species present in fluxes as received and after a heat treatment to 1573 K and further solidification at two different cooling velocities. Fluxes as received show the presence of wollastonite (CaO·SiO 2) and a sodium carbonate (Na 2CO 3) as the main components; after the heat treatment, there was almost a whole transformation from the original compounds to cuspidine (3CaO·2SiO 2·CaF 2) and nepheline (Na 2O·Al 2O 3·2SiO 2) phases. These results were confirmed by X-ray powder diffraction (XRD) to the slowly cooling velocity. The FTIR technique is proposed as a useful and complementary technique to X-ray diffraction to study the structure of commercial fluxes for thin slab casting.
ISSN:0022-1139
1873-3328
DOI:10.1016/j.jfluchem.2011.02.019