Leach Testing of Coal Fly Ash to Assess Its Applicability in the Closure of Abandoned Underground Coal Mines in Mpumalanga Province, South Africa
Coal mining in the Emalahleni area has raised concerns due to uncontrolled water pollution by acid mine drainage (AMD). Mine water treatment with coal fly ash (CFA) was considered as one of the passive treatment options. Batch leach experiments using different mine water and coal fly ash ratios were undertaken to assess neutralisation potential and quality of resultant treated water. Moreover, the mine water leach procedure was undertaken to establish leaching characteristics of CFA while in contact with AMD. Results confirmed that AMD can be treated with CFA and yield alkaline leachates. They also confirmed that leachate pH and contaminant attenuation can be controlled by varying CFA-AMD ratios. At an optimum ratio (5∶1), CFA treatment produces circumneutral water and attenuates most of the metals dissolved in the AMD to below 1 mg/L levels. Mine water leaching protocol results indicated that at CFA∶AMD ratio of 5∶1, successive leaching of CFA can still generate alkalinity and sequestrate contaminants. However, risk of certain metals leaching into solution exists.
acid mine drainage coal fly ash batch leach Mine Water Leach Procedure
Supi Tlowana Henk Coetzee Viswanath Vadapalli Mosidi Makgae Richard Kruger
Council for Geoscience 280 Pretoria street, Pretoria South Africa Richonne Consulting, 7173 Somerset Mall, South Africa
国际会议
The 12th Congress of International Mine Water Association,IMWA2014(第十二届国际矿井水大会)
徐州
英文
389-394
2014-08-18（万方平台首次上网日期，不代表论文的发表时间）