Application of quantitative mineralogy on the neutralization–acid potential calculations within µm-scale stratified mine tailings

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• 作者：Mostafa Redwan ; Dieter Rammlmair ; Wilhelm Nikonow
• 关键词：Mining wastes ; Acid rock drainage ; Bulk neutralizing/acid potential ; Mineralogical neutralizing/acid potential ; Reactive transport modeling
• 刊名：Environmental Earth Sciences
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：76
• 期：1
• 全文大小：
• 刊物类别：Earth and Environmental Science
• 刊物主题：Geology; Hydrology/Water Resources; Geochemistry; Environmental Science and Engineering; Terrestrial Pollution; Biogeosciences;
• 出版者：Springer Berlin Heidelberg
• ISSN：1866-6299
• 卷排序：76

文摘

Estimation of the long-term environmental impact of mining wastes is of socio-economic interest. Bulk analytical approaches of the neutralizing (NP) and acid potentials (AP) provide in general worst-case scenarios for acid rock drainage (ARD) predictions and long-term evaluation. Taking individual graded layers with variable reactive mineral ratios into consideration, alternating zones, highly contrasting in their neutralizing and acid potential, can be identified and quantified using scanning electron microscope–mineral liberation analyzer (SEM–MLA) and μ-energy-dispersive X-ray fluorescence (EDXRF)–petrographic analyst (PA) for the first time. The bulk NP and AP values increased by a factor of 2.13 and 1.37, respectively, compared to the average values of the mineralogical NP/AP. At the contrasting boundaries, precipitation of pore-clogging secondary phases might be enhanced. These new information can be used as input parameters to model the future behavior of a non-homogeneous multiplied laminated body with reactive transport modeling.