A thermodynamic study of BaO-BaF2-Cr2O3 system fluxes used for dephosphorization of chromium-containing iron melts期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

A thermodynamic study of BaO-BaF2-Cr2O3 system fluxes used for dephosphorization of chromium-containing iron melts

Authors:	Lian-Fu Li Mao-Fa Jiang Wen-Zhong Wang Cheng-Ji Jin Zhao-Ping Chen

Affiliation:	(1) Present address: the Department of Ferrous Metallurgy, School of Materials and Metallurgy, Northeastern University, 110006 Shenyang, People’s Republic of China;(2) the Technology Center, Baosteel, 201900 Shanghai, China

Abstract:	Activities of Cr₂O₃ in BaO-BaF₂-Cr₂O₃ ternary fluxes are determined using a −Mo\|Cr+Cr₂O₃‖ ZrO₂(MgO)‖{Cu-Cr}_alloy + (Cr₂O₃)_fluxes\|Mo+ solid electrolyte cell in conditions of BaO-BaF₂-Cr₂O₃ system fluxes equilibrium with {Cu-Cr} alloy. Effects of Cr₂O₃ mole fraction, $X_{BaO} /X_{BaF_2 }$ ratio, and temperature on activities of Cr₂O₃ are investigated. The results indicate that Cr₂O₃ activities increase with an increase of its mole fraction, decrease with an increase of $X_{BaO} /X_{BaF_2 }$ ratio, and decrease with an increase of system temperature. It can be concluded from XRD and chemical analysis that the isothermal phase diagrams of BaO-BaF₂-Cr₂O₃ fluxes are composed of nine zones at 1523 K and four zones at 1673 K, respectively. Isoactivity diagrams of the ternary system are given here. Additionally, the factors affecting dephosphorization and chromium retention of the fluxes are also investigated.

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