Transition of Blast Furnace Slag from Silicate Based to Aluminate Based: Sulfide Capacity
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ffects the mechanical properties of steel products, such as strength, ductility, and toughness. Therefore, removing the sulfur from molten steel to under several parts per million is necessary to improve the mechanical properties. Blast furnace slag plays a significant role in desulfurization in the metal, and sulfide capacity has been emphasized over several decades in pyrometallurgical processes.[1–12] As a result of the consumption and huge global demand for high-quality steel products, and the increasing cost of raw materials for ironmaking, steel producers have increased their use of low-cost, low-grade raw materials. The usage of high Al2O3 ore will result in the slag system translation from silicate based to aluminate based. Thus, as a sequence of the previous studies[13,14] that refer to
ZHIMING YAN, XUEWEI LV, ZHENGDE PANG, WENCHAO HE, and CHENGUANG BAI are with the School of Materials Science and Engineering, Chongqing University, Chongqing, 400044 China. Contact e-mail: [email protected] DONG LIANG is with the Research Institute of Laiwu Iron & Steel Co. Ltd., No. 23 Changsheng Street, gangcheng District, Laiwu, 271100, China. Manuscript submitted March 21, 2017.
METALLURGICAL AND MATERIALS TRANSACTIONS B
the viscosity and the structure of the aluminosilicate slag, the desulfurization of high alumina slag is a concern in the present study. Although many studies on the sulfide capacity of BF slag have been reported, only the influence of the Al2O3 and the substitution of SiO2 by Al2O3 were summarized in the present work. Nzotta et al.[15–18] measured the sulfide capacity of the BF slag and found that it increases with increasing temperature, basicity, and basic oxide content by performing a systematic of binary, ternary, and multicomponent slag systems. Moreover, the replacement of SiO2 by Al2O3 has no considerable effect on the ability of the slag to capture sulfur in the CaO-10 mass pct MgO-SiO2-Al2O3 slag system.[17] Park and Park[1] found that the Al2O3 M SiO2 substitution does not affect the sulfide capacity in the CaO-MnO-MgO-SiO2-Al2O3 slag system. Drakaliysky et al.[19] investigated the sulfide capacities of a high Al2O3 slag system and showed that higher alumina content and slag basicity lead to higher sulfide capacities. Shankar et al.[6] and Taniguchi et al.[7] investigated the slag with high alumina using the gas-slag equilibrium technique, whereas the influence of alumina was not definitely clear. Therefore, the aluminosilicate BF slag will be a direction due to the usage of high Al2O3 ore, whereas sulfide capacity data for high alumina slag are lacking. In the present work, the sulfide capacity of
the Cao-SiO2-Al2O3-MgO-TiO2 slag system with high alumina at 1773 K (1500 °C) was investigated. Besides the experiment on sulfide capacity, several prediction models, such as Sosinsky’s,[20] Young’s,[21] Zhang’s,[22] KTH,[15–18] and Shankar’s,[6] were employed to calculate the sulfide capacity of the slag in comparison with the measurements.
and sulfur, respectively, in the gas phase; Kh is the equilibrium const
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