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Mineralogical, numerical and analytical studies of the coupled oxidation of pyrite and coal

Lookup NU author(s): Dr Catherine Gandy

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Abstract

Mineralogical, bulk and field leachate compositions are used to identify important processes governing the evolution of discharges from a coal spoil heap in County Durham. These processes are incorporated into a numerical one-dimensional advective-kinetic reactive transport model which reproduces field results, including gas compositions, to within an order of magnitude. Variation of input parameters allows the effects of incorrect initial assumptions on elemental profiles and discharge chemistry to be assessed. Analytical expressions for widths and speeds of kinetic reaction fronts are developed and used to predict long-term development of mineralogical distribution within the heap. Results are consistent with observations from the field site. Pyrite oxidation is expected to dominate O2 consumption in spoil heaps on the decadal timescale, although C oxidation may stabilize contaminants in effluents on the centennial scale.

Publication metadata

Author(s): Evans KA, Gandy CJ, Banwart SA

Publication type: Article

Publication status: Published

Journal: Mineralogical Magazine

Year: 2003

Volume: 67

Issue: 2

Pages: 381-398

Print publication date: 01/04/2003

ISSN (print): 0026-461X

ISSN (electronic): 1471-8022

Publisher: Mineralogical Society

URL: http://dx.doi.org/10.1180/0026461036720107

DOI: 10.1180/0026461036720107

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