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Vaporization behavior of lead from the FeO-CaO-SiO_2-Al_2O_3 slag system

Journal of University of Science and Technology Beijing 2008年第6期15卷 671-677页

作者： Yanling Zhang Rui Zhang Eiki Kasai Shiqi Li School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China Department of Industry Engineering Zhengzhou Institute of Aeronautical Industry Management Zhengzhou 450015 China Institute of Multidisciplinary Research for Advanced Materials Tohoku University Sendai 980-8577 Japan

Vaporization behavior （1163-1463 K） of lead in the slag system of FeO-CaO-SiO2-Al2O3 with CaC% 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-Al2O3 system＋PbO＋CaCl2 were metallic Pb, PbCl, PbCl2, and FeCl2, at the experimental temperature range. The experimental results show that the mole ratio of vaporized Cl in lead chlorides to vaporized Pb, simply expressed as Cl/Pb decreases with increasing temperature. The larger Cl/Pb means a larger ratio of gaseous PbCl2, since metallic Pb and PbCl vapors are formed in a similar reduction atmosphere. The evaporation is initially rapid and becomes steady after holding for 10 min. Gaseous PbCl2 is mainly formed during the heating period, and at the holding stage, it reacts with FeO to produce gaseous FeCl2 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.

关键词： slag system smelting process vaporization behavior lead

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Vapor pressure measurement of lead and lead chlorides in FeO_T-CaO-SiO_2-Al_2O_3 system

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Transactions of Nonferrous Metals Society of China 2015年第8期25卷 2772-2780页

作者：张延玲 Eiki KASAI 北京科技大学钢铁冶金新技术国家重点实验室北京100083 Graduate School of Environmental Studies Tohoku University

Vapor pressure of lead and lead chlorides from FeOT？CaO？SiO2？Al2O3 slag system was measured by using Knudsen effusion method. The results suggest that the vapor pressures of lead and lead chlorides increase with increasing temperature. For the slag systems without chlorine, the logarithm of vapor pressure （lnp） shows highly linear dependency on the reciprocal of temperature （1/T）, and higher vapor pressure is observed in the condition where more metallic lead vapor is formed. In this case, the vapor pressure of lead increases with increasing slag basicity （w（CaO）/w（SiO2））, increasing FeO content andw（Fe2＋）/w（Fe3＋） ratio. For the case of slag system with chlorine addition, the total pressures of PbCl2 and PbCl increase with decreasing basicity and FeO content of slag.

关键词：金属Pb vapor pressure Knudsen effusion method metallic Pb lead chlorides smelting process

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