Yeheyis Muluken B, Shang Julie Q, Yanful Ernest K
Department of Civil and Environmental Engineering, The University of Western Ontario, London, Ontario, Canada.
J Environ Manage. 2009 Oct;91(1):237-44. doi: 10.1016/j.jenvman.2009.08.010. Epub 2009 Sep 10.
This study presents the results of a laboratory investigation conducted to evaluate the efficiency of coal fly ash to control the formation of acid mine drainage (AMD) from mine waste. Site-specific materials, coal fly ash from Atikokan Thermal Generating Station and mine tailings from Musselwhite mine, were mixed at different proportions for the investigation of the drainage chemistry and the optimal mix using static testing (acid-base accounting) and kinetic (column) testing. The acid-base accounting (ABA) results indicated that the fly ash possessed strong alkaline (neutralization) potential (NP) and could be used in the management of reactive mine tailings, thus ensuring prevention of AMD in the long-term. Column tests conducted in the laboratory to further investigate long-term performance of fly ash in the neutralization and prevention of acid mine drainage from tailings similarly showed that mixing fly ash with mine tailings reduces dissolution of many heavy metals from tailings by providing alkalinity to the system. It was found that a fly ash to tailings mass ratio equal to or greater than 15% can effectively prevent AMD generation from Musselwhite mine tailings in the co-placement approach.
本研究展示了一项实验室调查的结果，该调查旨在评估粉煤灰控制矿山废弃物产生酸性矿山排水（AMD）的效率。将特定场地的材料，即来自阿蒂科肯热电厂的粉煤灰和贻贝白矿的尾矿，按不同比例混合，以通过静态测试（酸碱核算）和动力学（柱）测试来研究排水化学和最佳混合比例。酸碱核算（ABA）结果表明，粉煤灰具有很强的碱性（中和）潜力（NP），可用于活性矿山尾矿的管理，从而确保长期预防AMD。在实验室进行的柱测试，以进一步研究粉煤灰在中和及预防尾矿酸性矿山排水方面的长期性能，同样表明将粉煤灰与尾矿混合可通过为系统提供碱度来减少尾矿中许多重金属的溶解。研究发现，在共处置方法中，粉煤灰与尾矿的质量比等于或大于15%可有效防止贻贝白矿尾矿产生AMD。
