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There are 32 papers published in subject: since this site started. |
Results per page: | 32 Total, 4 Pages | << First < Previous 1 2 3 4 |
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1. Study on CaO decomposing bastnaesite in assistant of NaCl-CaCl2 | |||
Bian Xue,Wu Wenyuan,Chang Hongtao,Peng Kewu,Xu Jingyu,Sun Shuchen, Tu Ganfeng | |||
Metallurgical Engineering 20 November 2006 | |||
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Abstract:Now in process of bastnaesite decomposed, fluorine gives out as gas phase. Therefore, fluorine resource is wasted, and the environment is also polluted. In order to find new cleaning metallurgy method, the decomposition reactions of heading mineral roasting by CaO-NaCl-CaCl2 are studied by means of TG-DTA and XRD methods. The relationship between decomposition ratio and four factors is studied by the quadratic regression orthogonal analysis, and then the regression equation is obtained. The optimum process conditions are obtained as follows: roasting temperature: 700℃, CaO addition: 15%, NaCl-CaCl2 addition: 10%, roasting time: 60min, the decomposition ratio: 92.14%. Through analysis, because CaO is added, fluorine exists in roasting products as CaF2 solid, and the formation of gas phase fluorine is restrained. Thus it is shown that the method is a cleaning metallurgy technology in this thesis. | |||
TO cite this article:Bian Xue,Wu Wenyuan,Chang Hongtao, et al. Study on CaO decomposing bastnaesite in assistant of NaCl-CaCl2[OL].[20 November 2006] http://en.paper.edu.cn/en_releasepaper/content/9708 |
2. Phase relation and thermodynamic study of the Pt-Zn system | |||
Qiao Zhiyu,Yuan Wenxia,Huang Yuazhang | |||
Metallurgical Engineering 20 March 2006 | |||
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Abstract:Phase relation in the Pt-Zn binary system from 63.08 to 84.51 at.% Zn between 736-1090 K has been investigated by an isopiestic method. The phase boundaries of four intermetallic compounds were fixed based on the experimental data. Activities and partial molar enthalpies of zinc in the Pt-Zn system in the temperature range of 736-1090 K were derived from isopiestic method. The partial molar entropies of zinc were obtained by application of the Gibbs-Helmholtz relations. | |||
TO cite this article:Qiao Zhiyu,Yuan Wenxia,Huang Yuazhang. Phase relation and thermodynamic study of the Pt-Zn system[OL].[20 March 2006] http://en.paper.edu.cn/en_releasepaper/content/5782 |
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