| Records |
| Author |
Burt, R.A.; Caruccio, F.T. |
| Title |
The effect of limestone treatments on the rate of acid generation from pyritic mine gangue |
Type |
Journal Article |
| Year |
1986 |
Publication |
Environmental geochemistry and health |
Abbreviated Journal |
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| Volume |
8 |
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Pages |
8 |
| Keywords |
mine water treatment |
| Abstract |
Surface water enters the Haile Gold Mine, Lancaster County, South Carolina by means of a small stream and is ponded behind a dam and in an abandoned pit. This water is affected by acidic drainage. In spite of the large exposures of potentially acid producing pyritic rock, the flux of acid to the water is relatively low. Nevertheless, the resulting pH values of the mine water are low (around 3.5) due to negligible buffering capacity. In view of the observed low release of acidity, the potential for acid drainage abatement by limestone ameliorants appears feasible. This study investigated the effects of limestone treatment on acid generation rates of the Haile mine pyritic rocks through a series of leaching experiments. Below a critical alkalinity threshold value, solutions of dissolved limestone were found consistently to accelerate the rate of pyrite oxidation by varying degrees. The oxidation rates were further accelerated by admixing solid limestone with the pyritic rock. However, after a period of about a month, the pyrite oxidation rate of the admixed samples declined to a level lower than that of untreated pyrite. Leachates produced by the pyrite and limestone mixtures contained little if any iron. Further, in the mixtures, an alteration of the pyrite surface was apparent. The observed behaviour of the treated pyrite appears to be related to the immersion of the pyrite grains within a high alkalinity/high pH environment. The high pH increases the rate of oxidation of ferrous iron which results in a higher concentration of ferric iron at the pyrite surface. This, in turn, increases the rate of pyrite oxidation. Above a threshold alkalinity value, the precipitation of hydrous iron oxides at the pyrite surface eventually outpaces acid generation and coats the pyrite surface, retarding the rate of pyrite oxidation. |
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0269-4042 |
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Sept; The effect of limestone treatments on the rate of acid generation from pyritic mine gangue; London: Chapman & Hall; file:///C:/Dokumente%20und%20Einstellungen/Stefan/Eigene%20Dateien/Artikel/7021.pdf; Opac |
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CBU @ c.wolke @ 7021 |
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14 |
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| Author |
Karathanasis, A.D.; Barton, C.D. |
| Title |
The revival of a failed constructed wetland treating a high Fe load AMD |
Type |
Book Chapter |
| Year |
1999 |
Publication |
Proceedings; biogeochemistry of trace elements in coal and coal combustion byproducts |
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abandoned mines acid mine drainage anaerobic environment carbonate rocks characterization composting constructed wetlands design environmental analysis ferrihydrite geologic hazards hydrology hydroxides iron iron hydroxides Kentucky limestone metals minerals mines organic compounds oxides pollution remediation runoff sedimentary rocks sediments solubility sulfate ion United States water quality water treatment wetlands 22, Environmental geology |
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Kluwer Academic/Plenum Publishers |
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New York |
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Sajwan, K.S.; Alva, A.K.; Keefer, R.F. |
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0306462885 |
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The revival of a failed constructed wetland treating a high Fe load AMD; GeoRef; English; 2002-039561; Fourth international conference on the Biogeochemistry of trace elements, Berkeley, CA, United States, June 23, 1997 References: 45; illus. incl. 2 tables, sketch maps |
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CBU @ c.wolke @ 16571 |
Serial |
82 |
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| Author |
Murayama, T. |
| Title |
Application Of Immobilized Thiobacillus-Ferrooxidans For Large-Scale Treatment Of Acid-Mine Drainage |
Type |
Journal Article |
| Year |
1987 |
Publication |
Methods Enzymol. |
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136 |
Issue |
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Pages |
530-540 |
| Keywords |
mine water treatment |
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Application Of Immobilized Thiobacillus-Ferrooxidans For Large-Scale Treatment Of Acid-Mine Drainage; Wos:A1987m167600047; Times Cited: 6; ISI Web of Science |
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no |
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CBU @ c.wolke @ 9106 |
Serial |
92 |
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| Author |
Kothe, E. |
| Title |
Molecular mechanisms in bio-geo-interaactions: From a case study to general mechanisms |
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Journal Article |
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2005 |
Publication |
Chemie Der Erde-Geochemistry |
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65 |
Issue |
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7-27 |
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mine water treatment |
| Abstract |
The understanding of molecular mechanisms in the cycling of elements in general is essential to our alteration of current processes. One field where such geochemical element cycles are of major importance is the prevention and treatment of acid mine drainage waters (AMD) which are prone to occur in every anthropogenic, modified landscape where sulfidic rock material has been brought to the surface during mine operations. Microbiologically controlled production of AMD leads not only to acidification, but at the same time the dissolution of heavy metals makes them bioavailable posing a potential ecotoxicological risk. The water path then can contaminate surface and ground water resources which leads to even bigger problems in large catchment areas. The investigation of mechanisms in natural attenuation has already provided first ideas for applications of naturally occurring bioremediation schemes. Especially an improved soil microflora can enhance the natural attenuation when adapted microbes are applied to contaminated areas. Future schemes for plant extraction, control of water efflux by increasing evapotranspiration, and by subsequent land use with agricultural plants with biostabilization and phytosequestration potential will provide putative control measures. The mechanisms in parts of these processes have been evaluated and the resulting synthesis applied to derive a bioremediation plan using the former uranium mine in Eastern Thuringia as a case study. (c) 2005 Elsevier GrnbH. All rights reserved. |
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Molecular mechanisms in bio-geo-interaactions: From a case study to general mechanisms; Wos:000233975000002; Times Cited: 0; ISI Web of Science |
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no |
| Call Number |
CBU @ c.wolke @ 16965 |
Serial |
114 |
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| Author |
Zou, L.H. |
| Title |
Sulfide precipitation flotation for treatment of acidic mine waste water |
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Journal Article |
| Year |
2000 |
Publication |
Transactions of Nonferrous Metals Society of China |
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10 |
Issue |
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Pages |
106-109 |
| Keywords |
mine water treatment |
| Abstract |
Sulfide precipitation flotation of copper-iron-bearing acidic waste water from a large copper mine and the stimulated waste water were studied. The pH of the waste water was 2.2, with 130 mg/L Cu2+ and 500 mg/L Fe3+ (Fe2+). Results show that, when Na2S was added as precipitating agent, sodium butylxanthate as collector and at pH 2.0, the removal of copper could be as high as 99.7 % and the residual copper decreased to 0.2 mg/L, however, almost no iron was removed. When the floated solution was neutralized to pH = 8.0, more than 98 % iron was precipitated and the residual iron was less than 10 mg/L. In experiment on actual mine effluents, after the use of precipitate flotation technology to recover copper and pH neutralization to precipitate iron, the treated waste water does meet the emission standards for sewage and valuable floating copper graded 37.12%. The chemical calculation and mechanism of solution were also presented. |
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Sulfide precipitation flotation for treatment of acidic mine waste water; Wos:000088249500025; Times Cited: 0; ISI Web of Science |
Approved |
no |
| Call Number |
CBU @ c.wolke @ 17086 |
Serial |
128 |
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