Thermodynamics of phosphorus and sulfur in the BaO-MnO flux system between 1,573 and 1,673 K

Journal Article · Wed Mar 31 23:00:00 EST 1993 · Metallurgical Transactions, B (Process Metallurgy); (United States)

DOI:https://doi.org/10.1007/BF02659137· OSTI ID:6513857

Watanabe, Yoshinori ^[1]; Kitamura, Katsuhiro ^[2]; Rachev, Ivan Petkov ^[3]; Tsukihashi, Fumitaka; Sano, Nobuo ^[4]

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1. NKK, Kanagawa (Japan)
2. Honda R and D Co. Ltd., Tochigi (Japan)
3. Nippon Steel, Chiba (Japan)
4. Univ. of Tokyo (Japan)

The oxidative dephosphorization of carbon-saturated Fe-Mn alloys was successfully demonstrated by measuring the phosphorus partition ratio between BaO-MnO, BaO-MnO-BaF[sub 2], and BaO-CaO[sub satd.]-MnO fluxes and liquid Fe-Mn-C[sub satd.] alloy between 1,573 and 1,673 K. The phosphorus partition ratio increases with increasing BaO content of the flux. The phosphate capacity of the BaO-MnO flux is as high as that of the BaO-BaF[sub 2] flux and is far larger than those of CaO-bearing fluxes. Addition of BaF[sub 2] to the BaO-MnO flux increases BaO solubility, which increases the phosphate capacity. The manganese partition ratios between the BaO-MnO flux and Fe-Mn-C[sub satd.] alloy were approximately constant at 0.64, 0.33, and 0.23 at 1,573, 1,623, and 1,673 K, respectively. The carbon content of the BaO-MnO flux was measured as functions of slag composition, temperature, and partial pressure of CO. A stable species of carbon in the BaO-MnO flux was found to be BaC[sub 2] experimentally and thermodynamically. The sulfide capacity of the BaO-MnO system at 1,573 K has been shown to be far larger than any known flux systems and to be a few times larger than that for the BaO-BaF[sub 2] system.

• OSTI ID: 6513857
• Journal Information: Metallurgical Transactions, B (Process Metallurgy); (United States), Journal Name: Metallurgical Transactions, B (Process Metallurgy); (United States) Vol. 24B:2; ISSN MTTBCR; ISSN 0360-2141
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360606* -- Other Materials-- Physical Properties-- (1992-)
ADDITIVES
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
BARIUM COMPOUNDS
BARIUM FLUORIDES
BARIUM OXIDES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL COMPOSITION
ELEMENTS
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
IRON ALLOYS
IRON BASE ALLOYS
MANGANESE ALLOYS
MANGANESE COMPOUNDS
MANGANESE OXIDES
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PHOSPHORUS
PHYSICAL PROPERTIES
PRESSURE DEPENDENCE
REMOVAL
SLAGS
STEELS
SULFUR
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS