Vaporization behavior of lead from the FeO-CaO-SiO_2-Al_2O_3 slag system |
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| Authors: | Yanling Zhang Rui Zhang Eiki Kasai Shiqi Li School of Metallurgical Ecological Engineering University of Science Technology Beijing Beijing China |
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| Affiliation: | [1]School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China [2]Department of Industry Engineering, Zhengzhou Institute of Aeronautical Industry Management, Zhengzhou 450015, China [3]Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan |
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| Abstract: | Vaporization behavior (1163-1463 K) of lead in the slag system of FeO-CaO-SiO2-Al2O3 with CaCl2 was examined.A thermodynamic estimation with the principle of Gibbs free energy minimization showed that the major vapor species from the sample of the FeO-CaO-SiO2-AI203 system+PbO+CaCl2 were metallic Pb,PbC1,PbCl2,and FeC12,at the experimental temperature range.The experimental results show that the mole ratio of vaporized CI in lead chlorides to vaporized Pb,simply expressed as CI/Pb,decreases with increasing temperature.The larger CUPb means a larger ratio of gaseous PbCl2,since metallic Pb and PbCI vapors are formed in a similar reduction atmosphere.The evaporation is initially rapid and becomes steady after holding for 10 rain.Gaseous PbCI2 is mainly formed during the heating period,and at the holding stage,it reacts with FeO to produce gaseous FeCI2.With regard to slag composition,FeO content and basicity significantly affect the evaporation of lead.High FeO content and high basicity promotes the formation of metallic Pb and PbCI,whereas,it prohibits PbCl2 evaporation. |
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| Keywords: | slag system smelting process vaporization behavior lead |
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