| Experimental Studies of the Solubility of Cassiterite and the Extraction of Tin from Granitic Melts |
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| 作者姓名： | 李统锦 |
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| 作者单位： | InstituteofGeochemistry,AcademiaSinica,Guiyang |
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| 摘 要： | Experiments indicate that the solubility of cassiterite can be enhanced by increasing either acidity or alkalinity in hydrothermal solutions as a consequence of the duality of tin.The minimum solubility of cassiterite is found in neutral solutions.F-and CL-coordination compounds of Sn can alternate with hydroxyl coordination compounds with changing pH in the solutions.In this case,F^- and Cl^- and OH^- can be substituted with each other.The dissolution reaction of cassiterite is of reducing nature.High temperature and acidic reducing environment are favorable for the dissolution of cassiterite and the trans-port of Sn^2 compounds in fluids or solutions.High-temperature fluoride and chloride fluids can all dissolve,extract and enrich Sn to form F^- and /or Cl-coordination compounds,However,Fplays a more important role than Cl.F-coordination compounds are more stable and efficient than Cl-coordination compounds during the transport an enrichment of Sn in melts or solutions.The solubili-ty of cassiterite and the amount of Sn extracted from granitic melt depend not only on T,P,pH and Eh in the fluids or solutions,but also on the amounts of dissociated F^- and Cl^- in the fluids.
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| 关 键 词： | 锡矿床 可溶性 花岗岩质熔浆 锡石 氟 氯 PH值 |
Experimental studies of the solubility of cassiterite and the extraction of tin from granitic melts |
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| Li Tongjin.Experimental Studies of the Solubility of Cassiterite and the Extraction of Tin from Granitic Melts[J].Chinese Journal of Geochemistry,1989,8(1):84-96. |
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| Authors: | Li Tongjin |
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| Institution: | (1) Institute of Geochemistry, Academia Sinica, Guiyang |
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| Abstract: | Experiments indicate that the solubility of cassiterite can be enhanced by increasing either acidity or alkalinity in hydrothermal
solutions as a consequence of the duality of tin. The minimum solubility of cassiterite is found in neutral solutions. F-
and CL-coordination compounds of Sn can alternate with hydroxy coordination compounds with changing pH in the solutions. In
this case, F- and Cl- and OH- can be substituted with each other. The dissolution reaction of cassiterite is of reducing nature. High temperature and acidic
reducing environment are favorable for the dissolution of cassiterite and the transport of Sn2+ compounds in fluids or solutions. High-temperature fluoride and chloride fluids can all dissolve, extract and enrich Sn to
form F- and /or Cl-coordination compounds, However, F plays a more important role than G. F-coordination compounds are more stable
and efficient than Cl-coordination compounds during the transport and enrichment of Sn in melts or solutions. The solubility
of cassiterite and the amount of Sn extracted from granitic melt depend not only on T, P, pH and Eh in the fluids or solutions,
but also on the amounts of dissociated F- and Cl- in the fluids. |
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