scholarly journals Chemical Treatment of Highly Toxic Acid Mine Drainage at A Gold Mining Site in Southwestern Siberia, Russia

Minerals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 867 ◽  
Author(s):  
Svetlana Bortnikova ◽  
Olga Gaskova ◽  
Nataliya Yurkevich ◽  
Olga Saeva ◽  
Natalya Abrosimova
Keyword(s):  
Field Experiments ◽  
Mine Drainage ◽  
Chemical Methods ◽  
Mining Site ◽  
Main Species ◽  
Alkaline Conditions ◽  
Southwestern Siberia ◽  
Subsequent Neutralization ◽  
High Sulfide ◽  
High Arsenic

The critical environmental situation in the region of southwestern Siberia (Komsomolsk settlement, Kemerovo region) is the result of the intentional displacement of mine tailings with high sulfide concentrations. During storage, ponds of acidic water with incredibly high arsenic (up to 4 g/L) and metals formed on the tailings. The application of chemical methods to treat these extremely toxic waters is implemented: milk of lime Ca(OH)2, sodium sulfide Na2S, and sodium hydroxide NaOH. Field experiments were carried out by sequential adding pre-weighed reagents to the solutions with control of the physicochemical parameters and element concentrations for each solution/reagent ratio. In the experiment with Ca(OH)2, the pH increased to neutral values most slowly, which is contrary to the results from the experiment with NaOH. When neutralizing solutions with NaOH, arsenic-containing phases are formed most actively, arsenate chalcophyllite Cu18Al2(AsO4)4(SO4)3(OH)24·36H2O, a hydrated iron arsenate scorodite, kaatialaite FeAs3O9·8H2O and Mg(H2AsO4)2. A common specificity of the neutralization processes is the rapid precipitation of Fe hydroxides and gypsum, then the reverse release of pollutants under alkaline conditions. The chemistry of the processes is described using thermodynamic modeling. The main species of arsenic in the solutions are iron-arsenate complexes; at the end of the experiments with Ca(OH)2, Na2S, and NaOH, the main species of arsenic is CaAsO4−, the most toxic acid H3AsO3 and AsO43−, respectively. It is recommended that full-scale experiments should use NaOH in the first stages and then Ca(OH)2 for the subsequent neutralization.

Application of physical-chemical and biological-chemical methods for heavy metals removal from acid mine drainage

2010 ◽  
Vol 150 ◽  
pp. 252-253 ◽  
Author(s):  
Alena Luptakova ◽  
Stefano Ubaldini ◽  
Eva Macingova ◽  
Pietro Fornari ◽  
Veronica Giuliano
Keyword(s):  
Heavy Metals ◽  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Chemical Methods ◽  
Heavy Metals Removal ◽  
Acid Mine ◽  
Physical Chemical ◽  
Metals Removal

scholarly journals An Alternative Method for the Obtention of Ceramic Foams from Gold and Silver Tailings with High Pyrite Content

Processes ◽  
2021 ◽  
Vol 9 (11) ◽  
pp. 1897
Author(s):  
Cristian Salazar ◽  
Lina Uribe
Keyword(s):  
Mechanical Strength ◽  
Apparent Density ◽  
Mine Drainage ◽  
Flotation Process ◽  
Foaming Agent ◽  
Ceramic Foams ◽  
Foaming Process ◽  
Mineral Phases ◽  
Pyrite Content ◽  
High Sulfide

Mining extraction operations generate a large number of tailings that contain different mineral phases such as quartz (principally), complex silicates, metallic elements, etc. Tailings impose a serious concern as it is possible to have acid mine drainage potential, leaching, and percolation events of heavy metals into the environment under certain conditions. The objective of this work was to evaluate the technical feasibility of producing ceramic foams from gold and silver tailings with high sulfide gangue through a previous flotation process to eliminate impurities associated to this gangue, as it can produce SO2 in the foaming process, and to analyze the effect of the sintering time and the temperature on the characteristics of foams obtained with this type of waste. The results showed that the inverse flotation reduced the presence of impurities associated to sulfides. In addition, it was possible to observe that in the absence of a foaming agent, it was possible to obtain ceramic foams with an apparent density and a mechanical strength near to 1.0 g/cm3 and 0.5 MPa, respectively, when a higher sintering temperature and time were used. On the other hand, the presence of the foaming agent reduced the apparent density to 0.5 g/cm3 without decreasing to a great extent the mechanical strength of ceramic foams at lower sintering temperatures.

scholarly journals Pig Manure Application for Remediation of Mine Soils in Murcia Province, SE Spain

2008 ◽  
Vol 8 ◽  
pp. 819-827 ◽  
Author(s):  
A. Faz ◽  
D. M. Carmona ◽  
A. Zanuzzi ◽  
A. R. Mermut
Keyword(s):  
Field Experiments ◽  
Mine Drainage ◽  
Soil Column ◽  
Metal Mobility ◽  
Pig Manure ◽  
Soil Conditions ◽  
Mine Soils ◽  
Plant Establishment ◽  
Column Studies ◽  
Undisturbed Soil

In southern Spain, specifically in Murcia Province, an increased pig population causes large amounts of slurry production that creates a very serious environmental concern. Our aim was to use this waste to reduce the acid mine drainage process, heavy metal mobilization, and to improve soil conditions to enhance plant establishment in mine soils. Pig manure, sewage sludge, and lime were used as soil amendments in a field experiment and in undisturbed soil column. Field experiments showed an increase in pH, total nitrogen, organic carbon, and carbonate contents; a reduction of diethylene-tetramine pentaacetic acid (DTPA)– and water-extractable metals; and an improvement of plant establishment. The field studies showed that pig manure could be utilized to remediate polluted soils. Column studies in the laboratory showed that amendment of mine soil with pig manure initially increased soil pH from 2.21 to 6.34, promoted reduced conditions in the surface soil, and decreased the metal mobility. After 21 weeks, while the leachate was slightly acidic, however, the mobility of metals was substantially low. Additions of 7 and 14% of pig manure were insufficient to maintain a neutral pH in the leachate. Therefore, continuous application of the pig manure may be advised.

scholarly journals Immobilization of Arsenite and Ferric Iron by Acidithiobacillus ferrooxidans and Its Relevance to Acid Mine Drainage

2003 ◽  
Vol 69 (10) ◽  
pp. 6165-6173 ◽  
Author(s):  
K. Duquesne ◽  
S. Lebrun ◽  
C. Casiot ◽  
O. Bruneel ◽  
J.-C. Personné ◽  
...  
Keyword(s):  
Acidithiobacillus Ferrooxidans ◽  
Common Property ◽  
Ferric Iron ◽  
Mine Drainage ◽  
Synthetic Medium ◽  
Potential Mechanism ◽  
Mining Site ◽  
Tailing Dam ◽  
Arsenite Removal ◽  
Acid Waters

ABSTRACT Weathering of the As-rich pyrite-rich tailings of the abandoned mining site of Carnoulès (southeastern France) results in the formation of acid waters heavily loaded with arsenic. Dissolved arsenic present in the seepage waters precipitates within a few meters from the bottom of the tailing dam in the presence of microorganisms. An Acidithiobacillus ferrooxidans strain, referred to as CC1, was isolated from the effluents. This strain was able to remove arsenic from a defined synthetic medium only when grown on ferrous iron. This A. ferrooxidans strain did not oxidize arsenite to arsenate directly or indirectly. Strain CC1 precipitated arsenic unexpectedly as arsenite but not arsenate, with ferric iron produced by its energy metabolism. Furthermore, arsenite was almost not found adsorbed on jarosite but associated with a poorly ordered schwertmannite. Arsenate is known to efficiently precipitate with ferric iron and sulfate in the form of more or less ordered schwertmannite, depending on the sulfur-to-arsenic ratio. Our data demonstrate that the coprecipitation of arsenite with schwertmannite also appears as a potential mechanism of arsenite removal in heavily contaminated acid waters. The removal of arsenite by coprecipitation with ferric iron appears to be a common property of the A. ferrooxidans species, as such a feature was observed with one private and three collection strains, one of which was the type strain.

Application of physical–chemical and biological–chemical methods for heavy metals removal from acid mine drainage

2012 ◽  
Vol 47 (11) ◽  
pp. 1633-1639 ◽  
Author(s):  
Alena Luptakova ◽  
Stefano Ubaldini ◽  
Eva Macingova ◽  
Pietro Fornari ◽  
Veronica Giuliano
Keyword(s):  
Heavy Metals ◽  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Chemical Methods ◽  
Heavy Metals Removal ◽  
Acid Mine ◽  
Physical Chemical ◽  
Metals Removal

scholarly journals Caractérisation Des Boues De Sucrerie Et Des Argiles Pour La Neutralisation Des Résidus Miniers Acides De La Mine De Kettara (Jebilet Centrales, Maroc)

2016 ◽  
Vol 12 (15) ◽  
pp. 321 ◽  
Author(s):  
Youssef Zerhouni ◽  
Saida Alikouss ◽  
Najib Saber ◽  
Samiha Nfissi ◽  
Ghalem Zahour ◽  
...  
Keyword(s):  
Mine Drainage ◽  
Atmospheric Oxygen ◽  
Physicochemical Characterization ◽  
Mining Industry ◽  
Ground Level ◽  
Mining Site ◽  
Environmental Consequences ◽  
High Concentrations ◽  
Main Component ◽  
The City

The minerals in the tailings, subject to the action of water and atmospheric oxygen, can generate Acid Mine Drainage (AMD). The latter is considered the most important environmental issue facing the mining industry. Its environmental impacts include the destruction of the flora and fauna in infected rivers and contamination of groundwater. The abandoned mine site Kettara, located about 32 km northwest of Marrakech (Morocco), chosen as a pilot site for this study, more than 3 million tons of tailings stored at ground level without any concern for their environmental consequences. These solid residues, with high concentrations of heavy metals (As, Pb, Fe, Cu ...), produce leachate very acidic (pH <2.9) may contaminate the water resources of the region. To mitigate the DMA phenomenon in this mining site, different protocols have been proposed using candy sludge (Mud Pulp Sweets: MPS), rich in carbonates from the Moroccan Sugar Company Unit (COSUMAR) and red clays (Clays: CLY) of the city of Safi. Physicochemical characterization and mineralogical of these two materials was performed an provided promising results regarding the effectiveness of the use of alkaline materials in the stabilization of tailings Kettara. Indeed, these starting materials are provided with a net neutralizing power which is of the order of 878.5 kg CaCO3 / t for MPS and 299 kg CaCO3 / t for CLY. The valuation of MPS and CLY, as a main component of an alkaline amendment, is likely to significantly reduce the effects of DMA in this semiarid climate mine.

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