3 edition of Acid neutralization mechanisms in mine tailings found in the catalog.
Acid neutralization mechanisms in mine tailings
|Statement||by Jasna Jurjovec|
|The Physical Object|
|Pagination||XI, 145 l.|
|Number of Pages||145|
Blowes DW, Ptacek CJ () Acid-neutralization mechanisms in inactive mine tailings. In: Jambor JL, Blowes DW (ed) The environmental geochemistry of sulfide mine-wastes. Mineralogical Association of Canada, short course handbook – Solute transport and chemical neutralization (pH 3 to 7) within a shallow heterogeneous aquifer producing acid mine drainage (AMD) are examined at an abandoned surface coal mine in West Virginia. The aquifer is undergoing partial neutralization by mixing with alkalinity from a leaking sludge disposal pond, extending in preferential zones controlled by aquifer heterogeneity.
Sampling and analysis. Mine tailings (70 samples), efflorescence salts (7 samples), soils (S 1-S 6), residential soils (C 1-C 21), and road dust (RD 1-RD 3), were collected during a year period (), results are shown in Tables 1 and and2. tailings samples were taken from one historical tailings pile for metal analyses by hand-excavation as deep as m ( kg per sample) and. Bioremediation of Acid Mine Tailings Waste. Acid mine is typically prevented by the introduction of alkaline materials to sulfide-rich mine wastes. The process is a chemical-neutralizing treatment that promotes neutralization of acid, reduced solubility of metals and consequent retention of metals in solution by precipitation.
stabilizing approach for the reclamation of metal-contaminated tailings. It offers the advantage of simultaneous physical (limitation of wind and water erosion) and chemical stabilization (acid neutralization, metals/metalloids immobilization). The mixing of tailings with organic amendments is. Acid mine drainage, contaminated water treatment by fly ash and neutralization by fly ash and mid‐bottom ash of thermal power plants. Acidic metal‐rich waters may also form in spoil heaps and mineral tailings, essentially by the same biologically driven reactions as in mine shafts and adits.
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This study focuses on acid neutralization reactions occurring in the saturated zone of tailings impoundments. To simulate conditions prevailing in many tailings impoundments, mol/L sulfuric acid was passed continuously through columns containing fresh, unoxidized tailings, collected at Kidd Creek metallurgical by: Detailed field studies conducted at the Heath Steele tailings impoundment, New Brunswick, Canada, illustrate the role of aluminosilicate-mineral dissolution in contributing to acid neutralization.
The tailings contain in excess of 85 wt.% sulfide minerals, and partial oxidation has led to the production of low-pH pore waters (pH.
This study focused on acid neutralization mechanisms and their effects on metal mobility within unamended tailings. A mol/L sulfuric acid was passed through the column continuously. This solution was chosen to represent an approximation of acidic pore water generated in a generic unsaturated zone of a tailings by: In this section, we describe several techniques to reuse a number of mine wastes (e.g., copper mine tailings, gold mine tailings, iron ore tailings, kimberlite tailings, and tungsten mine waste) that could potentially generate either AMD or contaminated neutral drainage because of their considerable sulfide mineral contents (SO 3 contents Cited by: tigations of mine waste systems were conducted using an equilibrium approach.
Examples of these investigations of acid neutralization reactions and metal attenuation at mine tailings sites include those of Walter et al.  and Liu and Narashimhan .
 In this study, the final solution of the problem was achieved in four by: Examples of these investigations of acid neutralization reactions and metal attenuation at mine tailings sites include those of Walter et al. and Liu and Narashimhan.  In this study, the final solution of the problem was achieved in four steps.
The initial conceptual model described above included only equilibrium reactions, which is. Examples of these investigations of acid neutralization reactions and metal attenuation at mine tailings sites include those of Walter et al. and Liu and Narashimhan.  In this study, the final solution of the problem was achieved in four steps.
The initial conceptual model described above included only equilibrium reactions, which is. Acid mine drainage (AMD) is an environmental problem produced when sulphides come in contact with an oxidant (± bacteria) and water, producing acid generation and metals leaching.
One solution proposed is to use red mud bauxite (RMB), which is very alkaline, to neutralize oxidized acidic tailings. The net result of acid-generating and-neutralizing reactions within mining wastes is termed acid rock drainage (ARD).
The oxidation of sulfide minerals is the major contributor to acid generation. Dissolution and alteration of various minerals can contribute to the neutralization of acid.
Definitions of alkalinity, acidity, and buffer capacity are reviewed, and a detailed discussion of the. Treatment of Mine Drainage Using Permeable Reactive Barriers by K.R.
Waybrant, C.J. Ptacek and D.W. Blowes The authors conducted an experiment using permeable reactive barriers designed to enhance bacterial sulfate reduction and metal sulfide precipitation, which approximate the acid-neutralization action of aquifers.
They found that as a. Effects of Bioavailable Heavy Metal Species, Arsenic, and Acid Drainage from Mine Tailings on a Microbial Community Sampled Along a Pollution Gradient in a Freshwater Ecosystem.
Geomicrobiology Journal: Vol. 32, No. 8, pp. acid, leading the formation of acidic mining waste water (AMD). This kind of phenomenon is not rare in acid uranium mine tailings ponds . Recent years, with the great development in uranium mining and expanding of heap leaching uranium mine enterprises, the amount of acid tailings and acidic water seepage continue to increase.
The remaining holes are flooded by groundwater forming so-called mine lakes. When in contact with oxygen-rich water the iron-sulphide species of the mine tailings are oxidized to sulphuric acid and ferric iron (Singer and Stumm ; Nordstrom et al.
EricksonLapakko b). Commonly referred to as acid rock drainage (ARD) or acid mine drainage (AMD), acid drainage from mine waste rock, tailings, and mine structures such as pits and underground workings is primarily a function of the mineralogy of the rock material and the availability of water and oxygen.
When mine and mine waste drainage have neutral pH, with a high concentration of dissolved metals, they are called neutral (or alkaline) mine drainage (Lottermoser, ).
When the rocks made of sulfur are excavated from a mine surface or an underground mine, they react with water and oxygen to form sulfuric acid.
Acid base accounting (ABA) is one of the most populate test protocols used today to assess and classify the acid generating potential of mine waste rock (tailings) The results of the ABA test.
More detail on acid neutralization mechanisms is provided in Section The sulphur species generated from sulphide oxidation is sulphate. Under the acidic conditions commonly encountered at some mining sites, dissolved sulphate concentrations can be up to approximat mg/L (Figure ).
After the depletion of the carbonate minerals, soluble Al hydroxides and Fe oxyhydroxides has occurred, the dissolution of aluminosilicates becomes the primary process contributing to acid neutralization.
Tailings impoundments. Mine tailings are the fine-grained material (clay sized to medium sand) that remains after the ore extraction process. The tailings impoundments evidenced a high potential contamination risk with As, Pb, Cu and Cd of river sediment. Two tailings impoundments (Cutii and Sartas) were classified as hazardous because of the leached fraction of metals and ions and ARD generation potential.
Groundwater contamination with Fe, Al and Mn is also possible. Ten microcosms of m3 water volume ( m i.d. and m height) were designed for neutralization studies representing hypolimnic ecosystem models for acid mine pit lakes.
Sediment and water were collected from an acid lignite mine pit lake (Brandenburg, Germany) and filled into the microcosms. To determine the efficacy of controlled in situ organic carbon amendments as a possible. Acid Neutralization A primary control on the process of metal attenuation at mining sites is acid neutralization.
Many factors affect the acid neutralization capacity of a system, including the type, abundance and reactivity of metal-bearing sulfides in the ore and waste rock, permeability of the mine workings or mine tailings, and the ability.Acid mine drainage (AMD), characterized by a high concentration of heavy metals, poses a threat to the ecosystem and human health.
Bioelectrochemical system (BES) is a promising technology for the simultaneous treatment of organic wastewater and recovery of metal ions from AMD.Geochemical modeling of precipitation reactions in the complex matrix of acid mine drainage is fundamental to understanding natural attenuation, lime treatment, and treatment procedures that separate constituents for potential reuse or recycling.
The three main dissolved constituents in acid mine drainage are iron, aluminum, and sulfate. During the neutralization of acid mine drainage (AMD) by.