Article
Licensed
Unlicensed
Requires Authentication
Mineralogy of the hardpan formation processes in the interface between sulfide-rich sludge and fly ash: Applications for acid mine drainage mitigation
-
Rafael Pérez-López
,
José Miguel Nieto
Published/Copyright:
April 1, 2015
Abstract
In the present study, experiments in non-saturated leaching columns were conducted to characterize the neoformed phases that precipitate at the interface between two waste residues having different chemical characteristics: an acid mine drainage producer residue (i.e., pyritic sludge) and an acidity neutralizer residue (i.e., coal combustion fly ash). A heating source was placed on top of one of the columns to accelerate oxidation and precipitation of newly formed phases, and thus, to observe longer-scale processes. When both residues are deposited together, the resulting leachates are characterized by alkaline pH, and low sulfate and metal concentrations. Two mechanisms help to improve the quality of the leachates. Over short-time scales, the leaching of pyrite at high pH (as a consequence of fly ash addition) favors the precipitation of ferrihydrite, encapsulating the pyrite grains and attenuating the oxidation process. Over longer time scales, a hardpan is promoted at the interface between both residues due to the precipitation of ferrihydrite, jarosite, and a Ca phase-gypsum or aragonite, depending on carbonate ion activity. Geochemical modeling of leachates using PHREEQC software predicted supersaturation in the observed minerals. The development of a relatively rigid crust at the interface favors the isolation of the mining waste from weathering processes, helped by the cementation of fly ash owing to aragonite precipitation, which ensures total isolation and neutralization of the mine residues.
Received: 2007-5-1
Accepted: 2007-7-23
Published Online: 2015-4-1
Published in Print: 2007-11-1
© 2015 by Walter de Gruyter Berlin/Boston
You are currently not able to access this content.
You are currently not able to access this content.
Articles in the same Issue
- Evaluation of image classification routines for determining modal mineralogy of rocks from X-ray maps
- Atomic structure and formation mechanism of (301) rutile twins from Diamantina (Brazil)
- Significance of the depth-related transition montmorillonite-beidellite in the Bouillante geothermal field (Guadeloupe, Lesser Antilles)
- High-pressure infrared spectra of talc and lawsonite
- Proton dynamics in letovicite: Part I. Static 1H and 15N NMR MAS experiments and lineshape simulations
- Proton dynamics in letovicite: Part II. Static 2H NMR experiments and lineshape simulations
- Chemical and structural variations at augite (100) deformation twin boundaries
- Comparative compressibility and structural behavior of spinel MgAl2O4 at high pressures: The independency on the degree of cation order
- Multiple breakdown and chemical equilibrium of silicic clinopyroxene under extreme metamorphic conditions in the Kontum Massif, central Vietnam
- Direct EXAFS evidence for incorporation of As5+ in the tetrahedral site of natural andraditic garnet
- Deformation-controlled cation diffusion in tourmaline: A microanalytical study on trace elements and boron isotopes
- Scandium-45 NMR of pyrope-grossular garnets: Resolution of multiple scandium sites and comparison with X-ray diffraction and X-ray absorption spectroscopy
- Partitioning of trace elements among coexisting crystals, melt, and supercritical fluid during isobaric crystallization and melting
- Thermal diffusivity of aluminous spinels and magnetite at elevated temperature with implications for heat transport in Earth’s transition zone
- High-pressure structure and bonding in CaIrO3: The structure model of MgSiO3 post-perovskite investigated with time-of-flight neutron powder diffraction
- Application of major- and trace-element geochemistry to refine U-Pb zircon, and Sm/Nd or Lu/Hf sampling targets for geochronology of HP and UHP eclogites, Western Gneiss Region, Norway
- Measurement of U-Pb ages of uraninite and davidite by laser ablation-HR-ICP-MS
- A modeling approach to understanding the role of microstructure development on crystalsize distributions and on recovering crystal-size distributions from thin slices
- Neptunium substitution in synthetic uranophane and soddyite
- Coexistence of twisted and untwisted crystals: An impurity/structural order model with implications for agate patterns
- Intracrystalline boron isotope partitioning in illite-smectite: Testing the geothermometer
- Mineralogy of the hardpan formation processes in the interface between sulfide-rich sludge and fly ash: Applications for acid mine drainage mitigation
- Dissolution of radiation-damaged zircon in lateritic soils
- Hydrogen analysis in minerals by continuous-flow mass spectrometry
- Re-examination of berlinite (AlPO4) from the Cioclovina Cave, Romania
- Letter. Valence state partitioning of Cr between pyroxene-melt: Effects of pyroxene and melt composition and direct determination of Cr valence states by XANES. Application to Martian basalt QUE 94201 composition
Keywords for this article
Acid mine drainage;
fly ash;
mine residue;
microencapsulation;
hardpan formation
Articles in the same Issue
- Evaluation of image classification routines for determining modal mineralogy of rocks from X-ray maps
- Atomic structure and formation mechanism of (301) rutile twins from Diamantina (Brazil)
- Significance of the depth-related transition montmorillonite-beidellite in the Bouillante geothermal field (Guadeloupe, Lesser Antilles)
- High-pressure infrared spectra of talc and lawsonite
- Proton dynamics in letovicite: Part I. Static 1H and 15N NMR MAS experiments and lineshape simulations
- Proton dynamics in letovicite: Part II. Static 2H NMR experiments and lineshape simulations
- Chemical and structural variations at augite (100) deformation twin boundaries
- Comparative compressibility and structural behavior of spinel MgAl2O4 at high pressures: The independency on the degree of cation order
- Multiple breakdown and chemical equilibrium of silicic clinopyroxene under extreme metamorphic conditions in the Kontum Massif, central Vietnam
- Direct EXAFS evidence for incorporation of As5+ in the tetrahedral site of natural andraditic garnet
- Deformation-controlled cation diffusion in tourmaline: A microanalytical study on trace elements and boron isotopes
- Scandium-45 NMR of pyrope-grossular garnets: Resolution of multiple scandium sites and comparison with X-ray diffraction and X-ray absorption spectroscopy
- Partitioning of trace elements among coexisting crystals, melt, and supercritical fluid during isobaric crystallization and melting
- Thermal diffusivity of aluminous spinels and magnetite at elevated temperature with implications for heat transport in Earth’s transition zone
- High-pressure structure and bonding in CaIrO3: The structure model of MgSiO3 post-perovskite investigated with time-of-flight neutron powder diffraction
- Application of major- and trace-element geochemistry to refine U-Pb zircon, and Sm/Nd or Lu/Hf sampling targets for geochronology of HP and UHP eclogites, Western Gneiss Region, Norway
- Measurement of U-Pb ages of uraninite and davidite by laser ablation-HR-ICP-MS
- A modeling approach to understanding the role of microstructure development on crystalsize distributions and on recovering crystal-size distributions from thin slices
- Neptunium substitution in synthetic uranophane and soddyite
- Coexistence of twisted and untwisted crystals: An impurity/structural order model with implications for agate patterns
- Intracrystalline boron isotope partitioning in illite-smectite: Testing the geothermometer
- Mineralogy of the hardpan formation processes in the interface between sulfide-rich sludge and fly ash: Applications for acid mine drainage mitigation
- Dissolution of radiation-damaged zircon in lateritic soils
- Hydrogen analysis in minerals by continuous-flow mass spectrometry
- Re-examination of berlinite (AlPO4) from the Cioclovina Cave, Romania
- Letter. Valence state partitioning of Cr between pyroxene-melt: Effects of pyroxene and melt composition and direct determination of Cr valence states by XANES. Application to Martian basalt QUE 94201 composition
