Coal Mine Acid Mine Drainage Treatment and Sludge Processing
Laboratory evaluation of acid drainage treatment paired with thermal recovery of reagents from the resulting sludge, with capital and operating cost estimates for mine water planners.
by JN Zvimba; J Mulopo, SR Motaung, JP Maree, M de Beer & TL Bolog | March 2010
A modified alkaline barium calcium process was tested on coal mine acid drainage, using calcium hydroxide neutralisation, hydrogen sulphide metal removal and barium carbonate sulphate removal. Gypsum formation during water treatment fell by 80 per cent, cutting the sludge sent to costly downstream processing to a fifth. Temperature, reaction time, reagent ratios and feed particle size affected thermal treatment of the sludge.
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