| Pyrite Oxidation in Leaching Process of Radionuclides and Heavy Metals from Uranium Mill Tailings |
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| 作者姓名： | MaTeng WangYanxin |
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| 作者单位： | EngineeringFaculty,ChinaUniversityofGeosciences,Wuhan430074 |
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| 基金项目： | The research work is jointly funded by the National Natural Science Foundation of China (No. 49832005)，the Teaching and Research Award Program for Outstanding Young Teachers in Higher Education Institutions of Ministry of Education, China. |
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| 摘 要： | Pyrite is a sensitive mineral in the geological environment,and its oxidation produces an important geochemical and environmental effect on the control of the redox and pH conditions.Column experiment results were used for modeling the geochemical processes in uranium mill tailings under leac-hing conditions.Oxidation of pyrite dominates the control of the tailings leaching process.The experi-mental and modeling results show that the leachate chemistry changes substantially with the decrease in pyrite consumption.In the initial stage of the leaching experiment,the pyrite is consumed several hun-dred times grater than that in the later stages,for much more oxygen is present in the tailings in the ini-tial stage.As the experiment continues,the tailings is gradually saturated with water and the oxygen concentration greatly decreases and so does pyrite consumption.The experimental and modeling results are useful for the design of mill tailing decommissioning:oxidation process and transport of radioactive nuclides and heavy metals can be constrained by controlling the oxygen concentration of tailings and the infiltration of meteoric water.
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| 关 键 词： | 地球化学 铀矿床 黄铁矿 雨水渗透 |
Pyrite Oxidation in Leaching Process of Radionuclides and Heavy Metals from Uranium Mill Tailings |
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| MA Teng,Wang Yanxin,Xu Lechang.Pyrite Oxidation in Leaching Process of Radionuclides and Heavy Metals from Uranium Mill Tailings[J].Journal of China University of Geosciences,2002,13(1):73-77. |
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| Authors: | MA Teng Wang Yanxin Xu Lechang |
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| Abstract: | Pyrite is a sensitive mineral in the geological environment, and its oxidation produces an important geochemical and environmental effect on the control of the redox and pH conditions. Column experiment results were used for modeling the geochemical processes in uranium mill tailings under leaching conditions. Oxidation of pyrite dominates the control of the tailings leaching process. The experimental and modeling results show that the leachate chemistry changes substantially with the decrease in pyrite consumption. In the initial stage of the leaching experiment, the pyrite is consumed several hundred times greater than that in the later stages, for much more oxygen is present in the tailings in the initial stage. As the experiment continues, the tailings is gradually saturated with water and the oxygen concentration greatly decreases and so does pyrite consumption. The experimental and modeling results are useful for the design of mill tailing decommissioning: oxidation process and transport of radioactive nuclides and heavy metals can be constrained by controlling the oxygen concentration of tailings and the infiltration of meteoric water. |
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| Keywords: | uranium geochemistry leaching pyrite |
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