Vaporization Behavior of Zinc from the FeO-CaO-SiO2-Al2O3 Slag System
Vaporization Behavior of Zinc from the FeO-CaO-SiO2-Al2O3 Slag System
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DOI：
10.2355/isijinternational.45.1813
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发表时间：
2005-12
影响因子：
1.8
通讯作者：
Yan-ling Zhang;E. Kasai;Takashi Nakamura
中科院分区：
文献类型：
--
作者：
Yan-ling Zhang;E. Kasai;Takashi Nakamura
Vaporization behavior (1 000-1 300°C) of zinc in the slag system FeO-CaO-SiO 2 -Al 2 O 3 has been examined, including the formation ratio of vapor species and their partitioning, along with the effect of process factors such as temperature, duration time, slag composition, addition of reductive agents, and chlorine content. A thermodynamic estimation with the principle of Gibbs free energy minimization shows that the major vapor species from the sample of FeO-CaO-SiO 2 -Al 2 O 3 system+ZnO+CaCl 2 are metallic Zn, ZnCl 2 and FeCl 2 at the experimental temperature range. The results suggest that the formation ratio of metallic Zn and FeCl 2 increases, while that of ZnCl 2 decreases, with an increase in temperature. The evaporation of sample is initially fast and becomes steady after holding for 10 min. Gaseous ZnCl 2 is mainly formed during heating period, at the holding stage it reacts with FeO to produce gaseous FeCl 2 . With regard to slag compositions, Fe 2 + /Fe 3 + ratio and basicity significantly affect the evaporation of zinc. The former governs the types of vapor species and the latter affects the total volatile ratio of zinc. The evaporation ratio of zinc can be enhanced by the addition of reductants such as carbon powder. It also increases with the increasing ratio of CaCl 2 /ZnO and levels off above 2.
