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EVALUATION OF ZEOLITE/BACKFILL BLEND FOR ACID MINE DRAINAGE REMEDIATION IN COAL MINE
Fallavena, V.L.V., M. Pires, S.F. Ferrarini, and A.P.B. Silveira.
Energy Fuels 32(2):2019-2027(2018)

Lab-scale leaching experiments were performed to assess remediation of acid mine drainage (AMD) from coal mines and the mobilization of ions in leachates using different zeolite/tailing blends. During the experiment, major and trace elements, pH, and conductivity were monitored over time. Results indicate that the addition of zeolites obtained from coal ash promoted the remediation of metal content in water generated by AMD and was a more beneficial process in the removal of metal ions. The 50:50 backfill/zeolite blend achieved reductions of 100, 98, 39, 55, 94, and 41% in aluminum, iron, calcium, magnesium, zinc, and manganese content, respectively, after 7 days of leaching. The increase in pH caused by zeolite addition promoted the precipitation of both metal ions and sulfate ions. The addition of 50% or 25% of zeolite in the backfill sample increased pH from 2.36 to 8.38 or 4.66, respectively, over a leaching period of 7 days.



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