热液中银、铅、锌共生分异的实验研究
An experimental study on paragenesis and separation of silver lead and zinc in hydrothermal solutions
查看参考文献13篇
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文摘
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对NaCl—HCl—H2O体系中银、铅、锌氯络合物稳定性进行实验研究，结果表明：热液中银、铅、锌氯络合物的稳定性受体系温度、pH、Eh以及组分浓度的控制。相同温度下，H^+、Cl^-浓度降低，还原硫增加，均使络合物趋于不稳定，发生不同程度的沉淀分异。当t=300℃,[Cl^-]=0.24mol/L,pH＝6．86时，铅氯络合物的沉淀量达55％，锌氯络合物的沉淀量超过92％。热液体系中硫化物的存在，对银的影响最大，溶液中的银氯络合物几乎沉淀完全，浓度可降至检测限以下。而铅和锌的氯络合物相对稳定。热力学计算表明：溶液中的银是以硫化银或自然银的形式沉淀析出。因此，还原硫的存在是导致热液体系中银与铅锌发生分异的重要因素。 |
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其他语种文摘
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The mechanism of paragenesis and separation of Ag,Pb and Zn has been studied by means of experiments on the stabilities of their chloride complexes in the NaCL-HCL-H-2O system, The experimental results show that the stabilities of silver-,lead-and zinc-chloride complexes are affected by temperature,pH,Eh and the concentrations of components. Chloride complexes of silver, lead and zinc become unstable and ore precipitated in varied extents at the same temperature with decreasing [H~+],[Cl~-]and incresing reduced sulfur concentration. At 300℃,[Cl~-]=0.24mol/L,pH=6.86,the precipitated fraction of lead-chloride complex reaches up to 55% and that of zinc-chloride complex exceeds 92%.When the sulfides are added in hydrothermal solutions, the silver concentration of the solution will decrease dramatically, even to zero,while chloride complexes of lead and zinc keep stable. Thermodynamic calculation indicates that the silver-chloride complex becomes unstable and silver is precipitated as Ag-2S or Ag. It is concluded that the presence of reduced sulfur will cause the separation silver from led and zinc. |
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来源
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矿物学报
,2003,23(1):31-36 【核心库】
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关键词
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铅氯络合物
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锌氯络合物
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银
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迁移形式
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热液体系
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硫化物
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成矿元素
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地址
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中国科学院研究生院, 北京, 100039
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-4734 |
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学科
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地质学 |
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基金
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国家自然科学基金
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文献收藏号
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CSCD:1279555
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