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首页> 外文期刊>Minerals Engineering >On the rate-limiting steps of pyritic refractory gold ore heap leaching: results from small and large column tests
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On the rate-limiting steps of pyritic refractory gold ore heap leaching: results from small and large column tests

机译：黄铁矿难处理金矿石堆浸的限速步骤：大小试验结果

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摘要

A pyritic refractory gold ore was oxidized in short and tall isothermal columns at different temperatures (22, 45 and 65 deg C) with consortia of mesophiles, moderate and extreme thermophiles under a variety of experimental conditions. These experiments were performed as part of a heap leach model validation program. Severe air channeling and bed compaction occurred in columns as short as 2 m packed with non-agglomerated ore particles. Similar problems were encountered in columns loaded with 9 mm agglomerates prepared with smaller particles (<3.3 mm). Although aeration was key to maintaining high potentials, neither the irrigation flow rate, nor the inoculation procedure, nor CO_2 enrichment had any significant effect on the oxidation kinetics at ambient temperature. Elemental sulfur oxidation was more rapid at elevated temperatures. Reasons why sulfide oxidation kinetics in the 65 deg C column were comparable to the 45 deg C test, and thus slower than predicted by the intrinsic Arrhenius activation energy of pyrite, are discussed.
机译：在不同的温度（22、45和65摄氏度）下，在不同的实验条件下，黄铁矿难熔金矿石在不同的温度（22、45和65摄氏度）下，通过短和高等温柱进行氧化。这些实验是作为堆浸模型验证程序的一部分进行的。在短至2 m的未聚集矿石颗粒填充柱中，发生了严重的空气窜流和床压实。在装有较小颗粒（<3.3 mm）的9 mm附聚物的色谱柱中遇到了类似的问题。尽管通气对于保持高电势至关重要，但无论是灌溉流速，接种程序还是CO_2富集都对环境温度下的氧化动力学没有显着影响。在升高的温度下，元素硫的氧化更快。讨论了为什么在65℃的柱中硫化物氧化动力学可以与45℃的试验相媲美，从而比黄铁矿的固有阿累尼乌斯活化能所预测的慢的原因。

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