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Representation of Oxidation Ability for Metallurgical Slags Based on the Ion and Molecule Coexistence Theory
Author(s) -
Yang Xuemin,
Zhang Meng,
Zhang Jianliang,
Li Pengcheng,
Li Jinyan,
Zhang Jian
Publication year - 2014
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201200138
Subject(s) - slag (welding) , coexistence theory , ion , chemistry , inorganic chemistry , metallurgy , molecule , materials science , organic chemistry , biochemistry , niche
The defined oxidation ability of metallurgical slags based on the ion and molecule coexistence theory (IMCT), i.e., the comprehensive mass action concentrationN F e t Oof iron oxides, has been verified through comparing the calculatedN F e t Oand the reported activitya F e t Oof iron oxides in the selected Fe t O‐containing slag systems. To calculate the defined comprehensive mass action concentrationN F e t Oof iron oxides in the selected slag systems, a thermodynamic model for calculating the mass action concentrations of structural units or ion couples in CaO–SiO 2 –MgO–FeO–Fe 2 O 3 –MnO–Al 2 O 3 –P 2 O 5 type slags, i.e., the IMCT‐ N i thermodynamic model, has been developed. The defined comprehensive mass action concentrationN F e t Oof iron oxides is more accurate than the measured activitya F e t Oof iron oxides to represent the slag oxidation ability of the selected Fe t O‐containing slag systems. The calculated comprehensive mass action concentrationN F e t Oof iron oxides or the reported activitya F e t Oof iron oxides in the selected Fe t O‐containing slag systems shows an increase tendency with an increase of optical basicity of the slags by takingΛ FeOas 0.93 andΛ F e 2 O 3as 0.69, orΛ FeOas 1.0 andΛ F e 2 O 3as 0.75, rather than by takingΛ FeOas 0.51 andΛ F e 2 O 3as 0.48. The slag oxidation ability represented by the defined comprehensive mass action concentrationN F e t Oof iron oxides or the measured activitya F e t Oof iron oxides is not only decided by the effects of iron oxides, but also by the comprehensive effects of both iron oxides and basic oxides as CaO or MgO or MnO in the selected Fe t O‐containing slag systems.