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首页> 美国政府科技报告 >Study of Kinetic Controls on Pyrite Oxidation with Application to Abandonment of Pyritic Uranium Tailings
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Study of Kinetic Controls on Pyrite Oxidation with Application to Abandonment of Pyritic Uranium Tailings

机译：硫铁矿氧化动力学控制研究及其在铁素体铀尾矿中的应用

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A laboratory investigation was undertaken to further clarify the controls on pyrite oxidation in carbonate-buffered solution. The behavior of oxidation rates over extended periods of time and reaction progress was examined. The effects of variation in localized moisture content in the presence of unlimited oxygen in the gas filled pores was also studied. Flow through systems were used in which granular pyrite or silica sand and pyrite mixtures were maintained under partially-saturated moisture conditions. Gas with atmospheric levels of oxygen was also passed continuously through the samples. The results of oxidation runs that had been on-going for about 10 thousand hours were compared to predictions of a model based on shrinking core theory. Experimental evidence suggests that over the course of about one year, resistance to oxidation increases as would occur if a reaction coating were formed on the pyrite surface. When compared to the theoretical behavior expected for such a process, only slight deviation is observed for the experimental data. Extended reaction progress of three separate grain-size fractions was simulated. Stages of vigorous oxidative treatment that were used to simulate extended reaction progress resulted in spurious behavior of the oxidation in the alkaline solution. The results do, to some extent, reflect behavior predicted by the shrinking core model. The effect of moisture content variation on oxidation rates was studied with the use of an unsaturated cell in which it was possible to control and maintain specified moisture content conditions while monitoring the rate of oxidation. The results of the experiment involving the unsaturated reaction cell show that the changes in local moisture content do not affect the rate of oxidation when oxygen is in continuous supply. (Abstract Truncated). (Atomindex citation 20:011459)

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