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Determination of Al 2 O 3 Activity by Reference Slag Method in CaO–SiO 2 –Al 2 O 3 –MgO Melts for Blast Furnace Slag with High Al 2 O 3 at 1873 K
Author(s) -
Hu Xinguang,
Zheng Haiyan,
Guo Yongchun,
Jiang Xin,
Gao Qiangjian,
Shen Fengman
Publication year - 2020
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.201900285
Subject(s) - slag (welding) , ground granulated blast furnace slag , metallurgy , materials science , analytical chemistry (journal) , mineralogy , nuclear chemistry , chemistry , chromatography , cement
With the increase in using high Al 2 O 3 iron ore, the content of Al 2 O 3 in blast furnace slag has increased sharply in recent years. Thus, the activity of high Al 2 O 3 slag in the blast furnace slag system needs further study. Herein, the activity of Al 2 O 3 ( a ( Al 2 O 3 )) in CaO–SiO 2 –Al 2 O 3 –MgO slag equilibrated with molten Cu at 1873 K is determined by applying the reference slag method. Isoactivity contours for Al 2 O 3 in the (CaO + MgO)–SiO 2 –Al 2 O 3 pseudoternary system are achieved for blast furnace slag, and the effects of R (mass% CaO/mass% SiO 2 ) and MgO/Al 2 O 3 on the activity of Al 2 O 3 are discussed. When Al 2 O 3 = 20 wt% and MgO/Al 2 O 3 = 0.4, with R increasing from 1.10 to 1.30, the activity of Al 2 O 3 decreases from 0.0423 to 0.0244. When Al 2 O 3 = 20 wt% and R = 1.25, with MgO/Al 2 O 3 increasing from 0.35 to 0.55, the activity of Al 2 O 3 decreases from 0.0470 to 0.0366. The reference slag method, herein, is feasible based on the experimental results and the reference slag method is simple, reasonable, and of high accuracy.