scholarly journals Biogenic catalysis in sulphide minerals' weathering processes and acid mine drainage genesis.

2014 ◽  
Vol 61 (1) ◽  
Author(s):  
Mária Kušnierová ◽  
Mária Praščáková ◽  
Anna K Nowak ◽  
Katarzyna Gorazda ◽  
Zbigniew Wzorek
Keyword(s):  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Precious Metals ◽  
Drainage Water ◽  
Arsenic Content ◽  
Natural Material ◽  
Oxidation Reactions ◽  
Process Selection ◽  
Acid Mine ◽  
Waste Dumps

Bioleaching and biogenesis are the main outputs from a large group of environmental processes participating in the natural material cycle, used in raw materials processing. Bio-oxidation reactions are the main basis for bioleaching procedures, often participating in parallel leaching processes. During the leaching processes of polycomponent sulphide substrates, the factor of process selection also plays an important role, being in direct relation to the electric properties and galvanic effect occurring between the individual components of the leaching substrate. This work gives a summary of the results of a research focused on the possibilities of using biotechnological procedures for treatment of Slovak sulphide ores. The object of the research is extraction of valuable metals, undesirable admixtures and degradation of crystal lattice of sulphides for subsequent chemical leaching processing of precious metals. The results of experiments on the existence of biogenic processes in situ on waste dumps from exploitation containing residual sulphides are also presented. The processes result in acid mine drainage water generation. These waters are strongly mineralised (over 48 g/L) and of low pH; that is why they are very caustic. The arsenic content (2.558 mg/L) in outflowing waters from old mines is high and over the limits set by the law.

Using red mud bauxite for the neutralization of acid mine tailings: a column leaching test

2006 ◽  
Vol 43 (11) ◽  
pp. 1167-1179 ◽  
Author(s):  
M Paradis ◽  
J Duchesne ◽  
A Lamontagne ◽  
D Isabel
Keyword(s):  
Acid Mine Drainage ◽  
Red Mud ◽  
Mine Drainage ◽  
Field Investigation ◽  
Drainage Water ◽  
Leaching Test ◽  
Column Leaching ◽  
Acid Mine ◽  
Column Leaching Test ◽  
Set Up

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. A column leaching test has been set up to evaluate major aspects of field constraints. First, a field investigation was conducted in which RMB was spread in aggregates before mixing with tailings. This setup has been reproduced in the laboratory and compared with a homogeneous mixture. The analyses of the water effluent do not show any important difference between the two mixtures. Second, some studies show that the addition of Cl brine to RMB helps to maintain the long-term neutralization potential. Brine addition increased the concentrations of Ca, Mg, Na, K, and Cu in drainage water. Columns were set up with 10% and 20% RMB to evaluate the effect of the quantity applied. Addition of greater than 20% RMB increases the leachate alkalinity and concentrations of Al, Cu, Pb, As, Fe, and SO42– in drainage waters. The addition of 10% RMB, however, significantly improves the quality of drainage water over a period of 125 days and results in concentrations and pH values within the ranges of those recommended by Directive 019 of the Ministère de l'environnement, Québec.Key words: acid mine drainage, red mud bauxite, tailings, environmental geochemistry, neutralization.

Clearing the Way: Using Turbines to Reclaim or Remediate Acid Mine Drainage

2006 ◽  
Author(s):  
Amy L. Miller ◽  
Alyson Stegman
Keyword(s):  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Undergraduate Research ◽  
Precious Metals ◽  
University Of Pittsburgh ◽  
Acid Mine ◽  
Technology Students ◽  
History Of ◽  
The University ◽  
Paint Pigment

Pennsylvania has a long history of coal mining. Unfortunately, it has left many scars. The Pennsylvania Department of Environmental Protection (PA DEP) is looking at the potential of using micro hydro turbines in acid mine drainage streams. They hope to make it profitable for business to "clean-up" the streams by providing seed money to initiate the hydro turbine projects. It is believed that businesses can profit from both the energy created by the turbines and the extraction of the acid mine drainage (AMD) minerals. The minerals and concentrations vary with each stream. Some possess precious metals, others contain minerals that are used in paint pigment, and still others are being researched for use in powder metallurgy. The paper outlines an undergraduate research project done at the University of Pittsburgh at Johnstown. The study is to create a comprehensive diagnostic spreadsheet to be used by the PA DEP to determine viable economical turbines based on waterway conditions. The study has parallel phases: one addressing issues related to turbine parameters and a second dealing with waterway variables. Also to be discussed in the paper is the use of the project as an undergraduate research study for technology students. For students interested in research or graduate school, it is immensely important to introduce them to research. By guiding them through the process they are better prepared for their future.

Sulfidogenic fluidized bed treatment of real acid mine drainage water

2011 ◽  
Vol 102 (2) ◽  
pp. 683-689 ◽  
Author(s):  
Erkan Sahinkaya ◽  
Fatih M. Gunes ◽  
Deniz Ucar ◽  
Anna H. Kaksonen
Keyword(s):  
Acid Mine Drainage ◽  
Fluidized Bed ◽  
Mine Drainage ◽  
Drainage Water ◽  
Acid Mine

scholarly journals Morphological and physiological characteristics of streamers in acid mine drainage water from a pyritic mine.

1985 ◽  
Vol 31 (1) ◽  
pp. 17-28 ◽  
Author(s):  
NORIO WAKAO ◽  
HIROKO TACHIBANA ◽  
YAEKO TANAKA ◽  
YONEKICHI SAKURAI ◽  
HIDEO SHIOTA
Keyword(s):  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Drainage Water ◽  
Physiological Characteristics ◽  
Acid Mine

scholarly journals Assessment of two kinetic tests to predict the acid mine drainage in waste rock samples of a uranium mine

2014 ◽  
Vol 67 (1) ◽  
pp. 107-113 ◽  
Author(s):  
Adriana Trópia de Abreu ◽  
Efigênia Miranda de Faria ◽  
Carla Thamilis Fonseca Chaves ◽  
Adilson do Lago Leite ◽  
Jorge Carvalho de Lena
Keyword(s):  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Waste Rock ◽  
Abandoned Mines ◽  
Uranium Mine ◽  
Atmospheric Conditions ◽  
System Quality ◽  
Oxidation Reactions ◽  
Acid Mine ◽  
Kinetic Tests

Acid mine drainage is the result of the oxidation process of sulfide bearing rocks. This process occurs when the sulfide material is exposed to atmospheric conditions. Under these conditions, successive oxidation reactions yield sulfuric acid generating acidic waters. This problem becomes more serious when the surrounding rocks are not able to neutralize the acid. The low pH condition of the drained water accelerates the solubility process of solid materials (rocks, soils and sediments) and favors metal and metalloid leaching making them available to the environment, which impairs the hydric system quality. This is a quite common situation at abandoned mines where the material is exposed, as at theOsamu Utsumi Mine in Caldas, MG. The main goal of this work was to assess and compare two kinetic tests in an attempt to predict the acid generation from the waste rock of the Osamu Utsumi Mine. The tests were carried out using a Soxhlet extractor and a leaching column. The leachate from the two tests was analyzed for the physical-chemical parameters (pH, Eh and electric conductivity) and metals and metalloids.

Biooxidation and Cyanidation for Gold and Silver Recovery from Acid Mine Drainage Generating Tailings (Ticapampa, Peru)

2007 ◽  
Vol 20-21 ◽  
pp. 91-94 ◽  
Author(s):  
Adrian A. Nagy ◽  
Eberhard D. Gock ◽  
Frank Melcher ◽  
Terzan Atmaca ◽  
Lothar Hahn ◽  
...  
Keyword(s):  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Precious Metals ◽  
Acidithiobacillus Thiooxidans ◽  
Silver Recovery ◽  
Acid Mine ◽  
Tailings Remediation ◽  
Refractory Gold ◽  
Shake Flasks ◽  
Sulfide Concentrate

The acid mine drainage (AMD) generating sulfidic tailings have a total mass of 1,639,130 t containing 1.65 g/t Au, 34.5 g/t Ag, 7.74 % Fe, 5.91 % S, 3.2 % As, 0.75 % Zn and 0.05 % Cu. The precious metals Au and Ag are enriched in the fine fractions. Approximately 35 % of the material is below 25 /m in size and 53 % below 63 /m. Electron microprobe analysis of a sulfide concentrate of the tailings, produced by gravity separation, proved the occurrence of pyrite and arsenopyrite with appreciable sphalerite and galena. Refractory gold (up to 316 g/t) is hosted in Asrich zones of some arsenopyrites. Approximately 200 g of the sulfide concentrate of the tailings was biooxidized in laboratory shake flasks using an adapted mixed culture of Acidithiobacillus ferrooxidans (Ram 6F), Acidithiobacillus thiooxidans (Ram 8T) and Leptospirillum ferrooxidans (R3). During biooxidation, arsenopyrite was preferentially dissolved and the secondary mineral tooeleite (Fe8(AsO4)6(OH)5·H2O) precipitated. The following cyanidation of the biooxidized sulfide concentrate showed a recovery of 97 % and 50 % for Au and Ag, respectively. The values were 56 % and 18 % for the untreated concentrate. The recovery of Au and Ag from the tailings significantly reduces the costs for the tailings remediation to mitigate AMD release.

THE EFFECT OF ACID MINE DRAINAGE WATER ON TWO PENNSYLVANIA SOILS

Soil Science ◽  
1979 ◽  
Vol 127 (2) ◽  
pp. 102-107 ◽  
Author(s):  
E. J. CIOLKOSZ ◽  
L. T. KARDOS ◽  
W. F. BEERS
Keyword(s):  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Drainage Water ◽  
Acid Mine

scholarly journals Phytoremediation and Nanoremediation : Emerging Techniques for Treatment of Acid Mine Drainage Water

2018 ◽  
Vol 3 (2) ◽  
pp. 190 ◽  
Author(s):  
Pratyush Kumar Das
Keyword(s):  
Acid Mine Drainage ◽  
Mine Water ◽  
Mine Drainage ◽  
Anthropogenic Activities ◽  
Drainage Water ◽  
Environmental Pollutant ◽  
Water Drainage ◽  
Mining Sites ◽  
Acid Mine ◽  
The Cost

<p>Drainage from mining sites containing sulfur bearing rocks is known as acid mine drainage (AMD). Acid mine drainage water is a serious environmental pollutant that has its effects on plants, animals and microflora of a region. Mine water drainage mainly occurs due to anthropogenic activities like mining that leave the sulfur bearing rocks exposed. This drainage water poses as a potent soil, water and ground water pollutant. Although a lot of remediation measures have been implemented in the past but, none of them have been able to solve the problem completely. This review intends to focus on new emerging and better techniques in the form of phytoremediation and nanoremediation for treatment of acid mine drainage water. Besides, the review also gives more importance to the phytoremediation technique over nanoremediation because of the cost effectiveness and eco-friendly nature of the first and the nascent status of the latter. A hypothetical model discussing the use of hyperaccumulator plants in remediation of acid mine water has been proposed. The model also proposes natural induction of the phytoremedial ability of the plants involved in the remediation process. The proposed model assisted by inputs from further research, may be helpful in proper treatment of acid mine drainage water in the near future.</p>

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