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Removal techniques for heavy metals from fly ash

  • Iman Meer
  • Rabia Nazir
REVIEW

Abstract

This study reviews different technologies for extraction of heavy metals from fly ash. With this perspective processes like bioleaching using microbes, carrier in pulp method, chemical extraction via acids, alkaline leachates and chelating agents, chloride evaporation process, electrodialytic and thermal treatments were studied thoroughly. A comprehensive comparison of all the techniques is also done by studying in detail their reaction conditions, metals leached and percentage extraction achieved. The study concluded that depending on the type of fly ash and metal under consideration determines the suitability of the process adopted for detoxification of fly ash. In addition to these, factors like cost, time and energy also define the final selection process.

Keywords

Fly ash treatment Metal extraction Leaching characteristics Metal concentration 

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Copyright information

© Springer Japan KK 2017

Authors and Affiliations

  1. 1.Department of Environmental SciencesKinnaird College for WomenLahorePakistan
  2. 2.Applied Chemistry Research Centre, Pakistan Council of Scientific and Industrial Research Laboratories ComplexLahorePakistan

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