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Catalan, L.J.J.; Yin, G. |
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Comparison of calcite to quicklime for amending partially oxidized sulfidic mine tailings before flooding |
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Journal Article |
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Year |
2003 |
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Environ Sci Technol |
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37 |
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7 |
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1408-1413 |
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Keywords |
mine water treatment |
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Abstract |
Flooding partially oxidized mine tailings for the purpose of mitigating further oxidation of sulfide minerals and generation of acid drainage is generally preceded by treatment with alkaline amendments to prevent releasing previously accumulated acidity to the water cover. This work compares the ability of calcite (CaCO3) and quicklime (CaO), two common amendments, to establish and maintain pH conditions and dissolved metal concentrations within environmentally acceptable ranges over long time periods. Although higher initial pH values were obtained with quicklime, the pH of quicklime treated tailings decreased over time. This was attributed to the low buffering capacity of quicklime treated tailings and to the consumption of hydroxide ions by incongruent dissolution of water-insoluble iron oxyhydroxysulfate minerals. In contrast, the pH of tailings treated with calcite increased initially and then remained stable at pH approximate to 6.7. This pH behavior was due to the lower reactivity of iron oxyhydroxysulfates with calcite, the increased buffering capacity provided by bicarbonate ions, and the incomplete dissolution of calcite. Overall, calcite was found preferable to quicklime for maintaining long-term neutral pH conditions in the treated tailings. With the exception of zinc, acceptable dissolved metal concentrations were achieved with calcite treated tailings. |
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0013-936x |
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Apr. 01; Comparison of calcite to quicklime for amending partially oxidized sulfidic mine tailings before flooding; Wos:000181977000050; Times Cited: 2; file:///C:/Dokumente%20und%20Einstellungen/Stefan/Eigene%20Dateien/Artikel/7917.pdf; ISI Web of Science |
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CBU @ c.wolke @ 7917 |
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118 |
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Potgieter-Vermaak, S.S.; Potgieter, J.H.; Monama, P.; Van Grieken, R. |
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Title |
Comparison of limestone, dolomite and fly ash as pre-treatment agents for acid mine drainage |
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Journal Article |
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2006 |
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Minerals Engineering |
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19 |
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5 |
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454-462 |
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Keywords |
Acid rock drainage Mining Tailings Environmental |
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The physical, chemical and biological nature of Vaal Dam water, the main source of water in Gauteng, South Africa, is often affected by underground water pollution (acid mine water) and industrial effluents. The ecological significance and detrimental effects necessitate investigations into treating the water prior to discharge into public streams. Although several acid mine water treatment techniques and methods exist, they all have certain disadvantages. Lime treatment is the most common approach. In this investigation, limestone, dolomite and fly ash were selected as pre-treatment agents based on their low cost. Simulated acid mine water containing these agents was tested using a Jar Test apparatus. Samples were analyzed before and after treatment for pH, ferrous, ferric, calcium, magnesium and sulphate ions. The study demonstrated that the quality of the water improved with an increase in the amount and surface area of the raw material dosed and an increase in contact time. It was also influenced by the chemical composition of the acid mine water and aeration. Chemical cost savings of 38% are achieved when lime is replaced with limestone, and cost savings of 23% and 48% can be accomplished when limestone is substituted with dolomite and fly ash respectively. This could result in significant savings to the gold and coal mining industries, and could lead to a mutual benefit/gain between industrialists/polluters and the public. |
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0892-6875 |
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Apr.; Comparison of limestone, dolomite and fly ash as pre-treatment agents for acid mine drainage; Science Direct |
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CBU @ c.wolke @ 17461 |
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42 |
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Komnitsas, K.; Xenidis, A.; Tabouris, S. |
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Title |
Composite cover for the prevention of acid mine drainage |
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Journal Article |
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2000 |
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Mining Environmental Management |
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8 |
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6 |
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14-17 |
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acid mine drainage; case studies; dams; Europe; field studies; Greece; Laurion Greece; pollution; preventive measures; remediation; Southern Europe; Sterea Ellas; tailings; tailings dams 22, Environmental geology |
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0969-4218 |
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Composite cover for the prevention of acid mine drainage; 2001-038333; References: 4; illus. incl. 4 tables United Kingdom (GBR); GeoRef; English |
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CBU @ c.wolke @ 5800 |
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327 |
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Author |
Nawrot, J.R.; Conley, P.S.; Sandusky, J.E. |
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Title |
Concentrated alkaline recharge pools for acid seep abatement; principles, design, construction, and performance |
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Book Chapter |
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1994 |
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Special Publication – United States. Bureau of Mines, Report: BUMINES-SP-06A-94 |
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382-391 |
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acid mine drainage; alkalinity; concentration; pollution; ponds; preventive measures; remediation; seepage; waste disposal; water quality 22, Environmental geology |
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Proceedings of the International land reclamation and mine drainage conference and Third international conference on The abatement of acidic drainage; Volume 1 of 4; Mine drainage |
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Concentrated alkaline recharge pools for acid seep abatement; principles, design, construction, and performance; GeoRef; English; 2007-045192; International land reclamation and mine drainage conference and Third international conference on The abatement of acidic drainage, Pittsburgh, PA, United States, April 24-29, 1994 References: 11; illus. incl. 2 tables, sketch map |
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CBU @ c.wolke @ 6589 |
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288 |
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Swoboda-Colberg, N.; Colberg, P.; Smith, J.L. |
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Title |
Constructed vertical flow aerated wetlands |
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RPT |
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1994 |
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acid mine drainage; aeration; Butte Montana; carbonate rocks; case studies; clastic sediments; Clear Creek County Colorado; Colorado; construction; controls; fluid dynamics; gravel; heavy metals; Idaho Springs Colorado; limestone; Montana; pollution; rates; sedimentary rocks; sediments; Silver Bow County Montana; substrates; tailings; United States; waste water; water; water management; water quality; water treatment; wetlands 22, Environmental geology |
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In the report, wetland technology is described in which the main reactive layer is limestone gravel (rather than organic material) which is overlain by a fine gravel filter and soil. The three-year project included laboratory and field studies. Vertical aerated wetlands, simulated by columns, constructed in the field and in the laboratory, were operated during the project. The report presents a summary of results given in previous reports and summaries of results obtained using water from Butte, MT, and field studies at the Rockford Tunnel, near Idaho Springs, CO. |
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University of Wyoming, L.W.Y.U.S. performer |
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Constructed vertical flow aerated wetlands; 1998-003373; GeoRef; English; Final report. Grant DI-196561 National Technical Information Service, (703)605-6000, order number PB96-196811NEG, Springfield, VA, United States |
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CBU @ c.wolke @ 6506 |
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226 |
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