Cross-Layer Leaching of Coal Fly Ash and Mine Tailings to Control Acid Generation from Mine Wastes

Mungazi, Allan A.; Gwenzi, Willis

doi:10.1007/s10230-019-00618-0

Cited by 8 publications

(1 citation statement)

References 41 publications

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“…The increase in AMD pH with the addition of CFA with different amounts in this study was in accordance with several previous studies. Mungazi and Gwenzi [23] measured the change in pH in the excavated rock mixed with CFA through column experiments and reported an increase in pH from very acidic (2.9) to alkaline (8.0). Research conducted by Nasir, Ibrahim and Arief [24] also showed an increase in the pH of AMD which was passed on an experimental column containing CFA.…”

Section: Effect Of Coal Fly-ash Application On Increasing Ph Of Acid Mine Drainagementioning

confidence: 99%

Increases in pH of acid mine drainage with coal fly-ash application

Priatmadi

Septiana

Mulyawan

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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Coal fly-ash (CFA), waste materials resulted from coal processing in power plants, contains oxides that have capability to neutralize hydrogen ions of acid mine drainage (AMD). A batch reactor experiment was conducted by adding different amounts of CFA (0, 50, 100, 150, 200, and 250 Mg ha−1) to reclaimed mining soils (RMS) to quantify the effect of CFA addition on changes in the pH of AMD. AMD was then flowed into the reactors following the incubation of the mixtures of RMS and CFA for 7 days, and the changes in pH of AMD in the reactors were monitored over 35 days. Results of the study showed pH and specific surface areas (SSA) of soils increased significantly with the addition of CFA. pH of AMD over 35 days also improved with CFA application, in which the degree of pH improvement was controlled by the amounts of added CFA. The addition of CFA <200 Mg ha−1 was not able to result in pH of AMD >6.0, and AMD pH of 6.0 was obtained when the amount of applied CFA reached to 200 Mg ha−1. Increasing pH of AMD is attributed to the CaO and MgO contained in the CFA neutralizing the H+ ions of AMD. Results of the study demonstrate the potential of CFA in remediation of AMD, in particularly in increasing pH of AMD.

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Section: Effect Of Coal Fly-ash Application On Increasing Ph Of Acid Mine Drainagementioning

confidence: 99%