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| Format: | Artículo científico |
| Language: | en |
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Universidad Nacional Autónoma de México
2007
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| Online Access: | https://www.redalyc.org/articulo.oa?id=57224203 |
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Table of Contents:
- Acid rock drainage and metal leaching from mine waste material (tailings) of a Pb-Zn-Ag skarn deposit: environmental assessment through static and kinetic laboratory tests Blanca Adriana Méndez Ortiz Marcos Gustavo Monroy Fernández Alejandro Carrillo Chávez Ciencias de la Tierra Pb Zn Ag skarn static tests kinetic tests In this work, the processes and products involved in the generation of acid rock drainage metalleaching (ARD-ML) from mine waste material (tailings) derived from the exploitation of an ore type Pb-Zn-Ag skarn were characterized. Laboratory tests (static and kinetic) of historic and recent tailings wereconducted along with the mineralogical characterization of solids, and chemical analyses of solids andleachates. Pyrite (FeS2) is the most abundant sulfi de phase, and one of the main minerals promoting ARDMLgeneration, followed by pyrrhotite (Fe1-xS) and arsenopyrite (FeAsS). Carbonates are present as calcite(CaCO3) and lesser amounts of ankerite [Ca(Fe,Mg)(CO3)2]. Also, smaller concentrations of quartz andfeldspar were identified. Results of the static tests (acid base accounting: ABA) indicate that both, recentand historic tailings, have a likely ARD-ML potential (neutralization potential, NP <1). Kinetic tests wereperformed in humidity cells to simulate the natural oxidation of primary mineral samples; the obtainedleachates had circum-neutral pH values (4.57.9) and relatively low heavy metals contents. Nevertheless,oxidation-neutralization curves suggest that oxidation capacity in both sample types is higher than theirneutralizing capacity, and that sulfi de oxidation is more important in historic than in recent tailings. Theobtained information, along with statistical tests (F ratio and t-student), demonstrated that the tailingshave a strong capacity to generate ARD-ML, and that the particular characteristics of the historic andrecent mine waste materials created different conditions for the generation of ARD-ML 2007 artículo científico 1026-8774 https://www.redalyc.org/articulo.oa?id=57224203 en http://www.redalyc.org/revista.oa?id=572 Revista Mexicana de Ciencias Geológicas application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Ciencias Geológicas (México) Num.2 Vol.24