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首页> 外文期刊>Hydrometallurgy >Oxidation of arsenite (As(III)) by ferric iron in the presence of pyrite and a mixed moderately thermophilic culture
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Oxidation of arsenite (As(III)) by ferric iron in the presence of pyrite and a mixed moderately thermophilic culture

机译：在黄铁矿和中等温热混合培养下，三价铁将亚铁（As（III））氧化

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摘要

The oxidation of As(III) by Fe~(3+) in the presence of pyrite and a mixed moderately thermophilic culture with high As(III)-resistance was investigated under various conditions. The oxidation of As(Ill) took place on the pyrite surface, and in the presence of excessive Fe~(3+) the reaction could be classified as a zero-order reaction or a first-order reaction, which depended on whether or not the catalytic sites on the pyrite surface were saturated by As(III). The rate constant of the first-order reaction, 0.0214 h~(-1), was calculated from the experimental data, and the rate constant of zero-order reaction was correlated to the pulp density of pyrite. A simple model was built to model the change of As(III) concentration during the biooxidation of arsenic bearing gold concentrates. The model showed that when the content of As in the concentrate was less than 11.4% (w/v) and that of pyrite was more than 60%, the As(III) level in the solution did not significantly increase over time.
机译：在各种条件下，研究了黄铁矿存在下Fe〜（3+）对Fe（3+）对As（III）的氧化作用和具有较高As（III）抗性的中等适度嗜热混合培养物。 As（III）的氧化发生在黄铁矿表面，并且在过量的Fe〜（3+）存在下，该反应可分为零级反应或一级反应，具体取决于是否黄铁矿表面的催化位点被As（III）饱和。由实验数据计算出一级反应的速率常数为0.0214 h〜（-1），零级反应的速率常数与黄铁矿的纸浆密度相关。建立了一个简单的模型来模拟含砷金精矿生物氧化过程中As（III）浓度的变化。该模型显示，当精矿中As含量小于11.4％（w / v）且黄铁矿含量大于60％时，溶液中As（III）的含量不会随时间显着增加。

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