"acid mine drainage and iron"

Mine Drainage

2021-9-24 · Mine drainage forms from a chemical reaction between water and rocks containing sulfur-bearing minerals. The resulting waters become rich in sulfuric acid and dissolved iron. As the iron settles out of the water, it can form red, orange, or yellow …

Environmental Effects of Mining Iron Mountain | USGS ...

2018-7-26 · Acid Mine Drainage. Acid mine drainage (AMD) is metal-rich, acidic water that is the result of water from mining activities flowing over or through rocks containing pyrite, a sulfur bearing mineral. This water reacts with pyrite and air to form sulfuric acid and dissolved iron.

How does mine drainage occur?

2021-9-21 · Mine drainage is formed when pyrite (an iron sulfide) is exposed and reacts with air and water to form sulfuric acid and dissolved iron. Some or all of this iron can precipitate to form the red, orange, or yellow sediments in the bottom of streams containing mine drainage. The acid …

Iron and acid removal from acid mine drainage in open ...

2020-10-13 · Iron and Acid Removal from Acid Mine Drainage in Open Limestone Systems Qingyun Sun Passive systems, like wetlands, anoxic limestone drains, and open limestone channels, show promise for treating acid mine drainage (AMD) discharges. Open limestone channels have been developed for over ten years and the treatment

Biological catalysis of the oxidation of iron (II) in acid ...

2021-9-2 · @article{osti_5433537, title = {Biological catalysis of the oxidation of iron (II) in acid mine waters in a sequencing batch suspended film reactor}, author = {Theis, T L and Ketchum, Jr, L H and Engelmann, W H}, abstractNote = {The use of a suspended growth system of T. ferrooxidans attached in a film to individual particles of bentonite and operated as a sequencing batch reactor has been ...

Recovery of Iron and Aluminum from Acid Mine Drainage …

2005-10-20 · The large volumes of sludge produced through the active treatment of acid mine drainage (AMD) require further processing and final disposal. AMD sludge typically contains a heterogeneous mixture of iron, aluminum, magnesium, and calcium oxides/hydroxides that are of …

Acid mine drainage remediation options: a review

2017-7-18 · acidophilic iron-oxidising bacteria have a pivotal role in the genesis of acid mine drainage (Johnson and Hallberg, 2003). Acid mine drainage (AMD) may form in under-ground workings (groundwaters) of deep mines, although this is generally of minor importance when a mine is in active production and water tables are kept artificially low by pumping.

Recovery of iron oxides from acid mine drainage and their ...

Iron oxide particles recovered from acid mine drainage represent a potential low-cost feedstock to replace reagent-grade chemicals in the production of goethite, ferrihydrite or magnetite with relatively high purity. Also, the properties of iron oxides recovered from acid mine drainage mean that the …

Mixotrophic Iron-Oxidizing Thiomonas Isolates from an …

Natural attenuation of heavy metals occurs via coupled microbial iron cycling and metal precipitation in creeks impacted by acid mine drainage (AMD). Here, we describe the isolation, characterization, and genomic sequencing of two iron-oxidizing bacteria (FeOB) species: Thiomonas ferrovorans …

Acid mine drainage: Sludge dewatering, metal recovery …

2020-10-13 · Acid mine drainage (AMD), formed during present mining activities or at abandoned mine sites, causes environmental problems that can negatively impact ecosystems and human health, due to its low pH, high acidity, elevated concentrations of metals or metalloids, and high sulfate content.

CHEMICAL AND BIOLOGICAL TREATMENT OF ACID …

2021-5-25 · This dissertation reports the design of a process (patent pending) to remove iron from acid mine drainage (AMD) without the formation of metal hydroxide sludge. The system includes the oxidation of ferrous iron in a packed bed bioreactor, the precipitation of iron within a fluidized bed, the removal of manganese and heavy metals (Cu, Ni, Zn)

Weld Range Iron Ore Project

2021-1-4 · WELD RANGE IRON ORE PROJECT ACID MINE DRAINAGE MANAGEMENT PLAN Document No: WR15-1015-EV-PLN-001 Final Page 7 of 25 December 2011 2.0 BACKGROUND 2.1 Project Description Sinosteel proposes to develop a new iron ore mine at Weld Range, located approximately 65 kilometres southwest of Meekatharra and 50 kilometres northwest of Cue in Western ...

Minerals | Free Full-Text | Geochemical Modeling of Iron ...

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 …

Acid mine drainage

Acid mine drainage (AMD) consists of metal-laden solutions produced by the oxidative dissolution of iron sulfide minerals exposed to air, moisture, and acidophilic microbes during the mining of coal and metal deposits. The pH of AMD is usually in the range of 2–6, but mine-impacted waters at circumneutral pH (5–8) are also common. Mine drainage usually contains elevated concentrations of ...

ESTIMATING IRON AND ALUMINUM CONTENT OF ACID …

2010-12-13 · acid mine drainage between: (1) the titratable acidity (as milligrams per liter calcium carbonate) to pH 4.0 and the concentration of dissolved ferric iron; and (2) the titratable acidity (as milligrams per liter calcium carbonate) from pH 4.0 to 5.0 and the concentration of dissolved aluminum.

Acid mine drainage biogeochemistry at Iron Mountain ...

2004-6-30 · The Richmond Mine at Iron Mountain, Shasta County, California, USA provides an excellent opportunity to study the chemical and biological controls on acid mine drainage (AMD) generation in situ, and to identify key factors controlling solution chemistry. Here we integrate four years of field-based geochemical data with 16S rRNA gene clone libraries and rRNA probe-based studies of microbial ...

Acid Mine Drainage: Sources, Impacts and Prevention

2017-2-27 · Acid mine drainage (AMD) is acidic water having pH of less than 5, and also containing iron, sulfate and other metals which are formed under natural conditions when hardrock mines containing pyrite are exposed to the atmosphere or oxidizing environments. In other words, AMD can also be stated as outflow of the acidic water from mining sites.

Iron removal in highly contaminated acid mine drainage ...

2017-6-20 · Acid mine drainage (AMD), which originates from reactions between water, air, and sulfidic mine wastes, is characterized by low pH and high concentrations of sulfate and metals (Nordstrom et al. 2015).The treatment of AMD aims to increase pH and alkalinity, as well as remove metals and sulfate.

Acid Mine Drainage

Acid Mine Drainage - an overview | ScienceDirect Topics

and acid mine drainage

2020-11-1 · Pyrite oxidation, which can lead to acid mine drainage, is a concern for miners all across the globe. However, little is known about the processes that cause this phenomenon.

The Behavior of Iron and Aluminum in Acid Mine …

The behavior of iron and aluminum in acid mine drainage (AMD) has been thoroughly studied during the last three decades [1–5] and the minerals con- trolling their solubility have been identified ...

Production of Iron Pigments (Goethite and Haematite) …

2011-8-23 · from the iron present in AMD. The pigments were characterized in terms of physical-chemical and colori-metric properties and tested for paint production and colored concrete. Key Words iron pigments, goethite, hematite, selective precipitation, acid mine drainage P_T_07_a5_P IMWA 2011 22/08/2011 1:40 AM Pa 469

Chemical Modeling of Acid Waters

Geochemical modeling of acid mine waters, ferrous iron oxidation rate studies, mass balance studies, measurements of negative pH, and modeling to demonstrate the consequences of mine plugging have been among the main results from our project''s …

Remediation of acid mine drainage | SpringerLink

2019-5-29 · Acid mine drainage induced by the mining industry causes environmental and economic issues. Acid mine drainage contains mainly metals such as Fe, Al, Cu, Ca, Mg, Mn and Zn. Preventing the formation of acid mine drainage has not been found feasible. As a consequence, remediation treatments have been developed during the last years to remove metals and obtain high-quality water, …

Acid Mine Drainage

Acid mine drainage (AMD) Acid mine drainage (AMD) is the runoff produced when water comes in contact with exposed rocks containing sulfur-bearing minerals that react with water and air to form sulfuric acid and dissolved iron. This acidic run-off dissolves heavy metals including copper, lead, and mercury which pollute ground and surface water.

Acid Mine Drainage and Metal Sulfate Minerals in the ...

Three study sites are located on Iron Mountain and one study site is at Bully Hill. Although mining occurred during a period of just over 100 years, it is estimated that acid mine drainage (AMD) will continue from Iron Mountain for over 3,200 years (Nordstrom and Alpers, 1998).

Acid mine drainage biogeochemistry at Iron Mountain ...

2017-8-29 · Acid mine drainage biogeochemistry at Iron Mountain, California Gregory K. Druschela),b) Department of Geology and Geophysics, The University of Wisconsin–Madison, Madison, Wisconsin 53706 Brett J. Bakera),c) Department of Earth and Planetary Sciences, University of California–Berkeley, Berkeley, California 94720 Thomas M. Gihringd) Department of Geology and Geophysics, The …