The Use of Static and Humidity Cell Tests to Assess the Effectiveness of Coal Waste Desulfurization on Acid Rock Drainage Risk

The Use of Static and Humidity Cell Tests to Assess the Effectiveness of Coal Waste... The environmental benefits of waste desulfurization were evaluated in the Santa Catarina coal field, Brazil. Coal waste from a beneficiation plant was separated into three density fractions, using a two stage process. Characterization of these fractions indicated that the low (D < 2.2 g/cm3) and high (D > 2.7 g/cm3) density fractions were potentially suitable for energy and sulfuric acid production, respectively. The waste fraction of intermediate density (2.2 < D < 2.7 g/cm3) represented 69% of the total mass studied and had a relatively low sulfide content, and it was postulated that it may be suitable for land disposal with minimum risk to the surrounding environment. This hypothesis was tested using laboratory-scale static and kinetic tests, which indicated that although the fraction remained net acid generating, the rate and net amount of metals, salts, and acidity that leached was considerably less than that of the discards before separation. It was concluded that this approach could reduce the amount of waste generated, as well as the associated pollution risk. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Mine Water and the Environment Springer Journals

The Use of Static and Humidity Cell Tests to Assess the Effectiveness of Coal Waste Desulfurization on Acid Rock Drainage Risk

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Publisher
Springer Berlin Heidelberg
Copyright
Copyright © 2017 by Springer-Verlag Berlin Heidelberg
Subject
Earth Sciences; Geology; Water Quality/Water Pollution; Hydrogeology; Mineral Resources; Ecotoxicology; Industrial Pollution Prevention
ISSN
1025-9112
eISSN
1616-1068
D.O.I.
10.1007/s10230-017-0435-7
Publisher site
See Article on Publisher Site

Abstract

The environmental benefits of waste desulfurization were evaluated in the Santa Catarina coal field, Brazil. Coal waste from a beneficiation plant was separated into three density fractions, using a two stage process. Characterization of these fractions indicated that the low (D < 2.2 g/cm3) and high (D > 2.7 g/cm3) density fractions were potentially suitable for energy and sulfuric acid production, respectively. The waste fraction of intermediate density (2.2 < D < 2.7 g/cm3) represented 69% of the total mass studied and had a relatively low sulfide content, and it was postulated that it may be suitable for land disposal with minimum risk to the surrounding environment. This hypothesis was tested using laboratory-scale static and kinetic tests, which indicated that although the fraction remained net acid generating, the rate and net amount of metals, salts, and acidity that leached was considerably less than that of the discards before separation. It was concluded that this approach could reduce the amount of waste generated, as well as the associated pollution risk.

Journal

Mine Water and the EnvironmentSpringer Journals

Published: Feb 25, 2017

References

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