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Numerical analysis of aerated heap bioleaching with variable irrigation and aeration combinations
Journal of Central South University ( IF 4.4 ) Pub Date : 2020-06-10 , DOI: 10.1007/s11771-020-4379-x
Ming-qing Huang , Ai-xiang Wu

Forced aeration is an effective way to accelerate the heap bioleaching process. To reveal the effects of different irrigation and aeration combinations on bioleaching performance of copper sulfides, numerical simulations with Comsol were carried out. Results showed the oxygen concentration is the highest at the bottom with forced aeration, the airflow transports spherically from the aeration pipeline to the slope, and the horizontal diffusion distance is further than vertical value. When the irrigation-to-aeration ratio is higher, the average heap temperatures are mainly decided by aeration rates; otherwise, temperature distributions are the equilibrium of mineral reaction heat, the livixiant driven heat and the airflow driven heat. When the aeration rate is higher than 0.90 m3/(m2·h), oxygen concentration is no longer a limiting factor for mineral dissolution. Additionally, on the premise of sufficient oxygen supply, Cu recovery rate is higher at the bottom with low irrigation rate; while it is higher at upper regions with high irrigation rate. The numerical analysis uncovered some insights into the dynamics and thermodynamics rules in bioleaching of copper sulfides with forced aeration.



中文翻译:

可变灌溉与曝气组合的曝气生物滤池数值分析

强制曝气是加速堆生物浸出过程的有效方法。为了揭示不同灌溉和曝气组合对硫化铜生物浸出性能的影响,使用Comsol进行了数值模拟。结果表明,在强制通风条件下,底部氧气浓度最高,气流从充气管道球形输送到斜坡,水平扩散距离远大于垂直距离。当灌溉与曝气比较高时,平均堆温度主要由曝气速率决定;否则,温度分布是矿物反应热,活性驱动热和气流驱动热的平衡。当曝气率高于0.90 m 3 /(m 2·h),氧气浓度不再是矿物质溶解的限制因素。另外,在有足够的氧气供应的前提下,底部的Cu回收率较高,灌溉速率较低。而在较高灌溉率的较高地区较高。数值分析揭示了在强制曝气条件下硫化铜生物浸出过程中动力学和热力学规则的一些见解。

更新日期:2020-06-10
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