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Author (up) Eger, P.; Melchert, G.; Antonson, D.; Wagner, J.
Title Magnesium hydroxide as a treatment for acid mine drainage in northern Minnesota Type Book Chapter
Year 1993 Publication Proceedings of the Annual National Meeting – American Society for Surface Mining and Reclamation, vol.10 Abbreviated Journal
Volume Issue Pages 204-217
Keywords acid mine drainage acidification alkaline earth metals chemical properties cobalt copper drainage experimental studies hydroxides laboratory studies lime magnesium magnesium hydroxide metals Minnesota nickel northern Minnesota oxides pH pollution porous materials reagents remediation residence time trace metals United States waste disposal zinc 22, Environmental geology
Abstract Three alkaline materials were investigated for their suitability to treat acid mine drainage generated by a research facility located at a remote site in northern Minnesota. The materials investigated were hydrated lime, sodium hydroxide, and magnesium hydroxide. All three reagents were successful at raising pH and removing trace metals from the drainage, but the magnesium hydroxide had the added benefit of producing a maximum pH of approximately 9.5, while the other two reagents resulted in pH values of 12 and greater. In addition, the magnesium hydroxide was available as a high solid content slurry (58%) which simplified application and handling, and which produced the lowest volume of sludge of the materials tested.
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Publisher Place of Publication Editor Zamora, B.A.; Connolly, R.E.
Language Summary Language Original Title
Series Editor Series Title The challenge of integrating diverse perspectives in reclamation Abbreviated Series Title
Series Volume Series Issue Edition
ISSN ISBN Medium
Area Expedition Conference
Notes Magnesium hydroxide as a treatment for acid mine drainage in northern Minnesota; GeoRef; English; 2002-028930; 10th annual national meeting of the American Society for Surface Mining and Reclamation, Spokane, WA, United States, May 16, 1993 References: 7; illus. incl. 4 tables Approved no
Call Number CBU @ c.wolke @ 16743 Serial 393
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Author (up) Eger, P.; Melchert, G.; Wagner, J.
Title Using passive treatment systems for mine closure – A good approach or a risky alternative? Type Journal Article
Year 2000 Publication Min. Eng. Abbreviated Journal
Volume 52 Issue 9 Pages 78-83
Keywords Pollution and waste management non radioactive Groundwater problems and environmental effects geological abstracts: environmental geology (72 14 2) geomechanics abstracts: excavations (77 10 10) acid mine drainage decommissioning mine waste open pit mine pH remediation
Abstract In 1991, LTV Steel Mining decided to close an open-pit taconite mine in northeastern Minnesota using a passive-treatment approach consisting of limiting infiltration into the stockpiles and wetland treatment to remove metals. More than 50 Mt (55 million st) of sulfide-containing waste had been stockpiled adjacent to the mine during its 30 years of operation. Drainage from the stockpiles contained elevated levels of copper, nickel, cobalt and zinc. Nickel is the major trace metal in the drainages. Before the closure, the annual median concentrations ranged from 1.5 to 50 mg/L. Copper, cobalt and zinc are also present but they are generally less than 5% of the nickel values. Median pH levels range from 5 to 7.5, but most of the stockpile drainages have pH levels greater than 6.5. Based on the chemical composition of each stockpile, a cover material was selected. The higher the potential that a stockpile had to produce acid drainage, the lower the permeability of the capping material required. Covers ranged from overburden soil removed at the mine to a flexible plastic liner. Predictions of the reduction in infiltration ranged from 40% for the native soil to more than 90% for the plastic liner. Five constructed wetlands have been installed since 1992. They have removed 60% to 90% of the nickel in the drainages. Total capital costs for all the infiltration reduction and wetlands exceeded $6.5 million, but maintenance costs are less than 1% of those for an active treatment plant. Because mine-drainage problems can continue for more than 100 years, the lower annual operating costs should pay for the construction of the wetland-treatment systems within seven years.
Address P. Eger, Minnesota Dept. of Natural Rsrces., St. Paul, MN, United States
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Series Editor Series Title Abbreviated Series Title
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ISSN 0026-5187 ISBN Medium
Area Expedition Conference
Notes Using passive treatment systems for mine closure – A good approach or a risky alternative?; 2285715; United-States 19; Geobase Approved no
Call Number CBU @ c.wolke @ 17539 Serial 392
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Author (up) Eger, P.; Wagner, J.R.; Kassa, J.R.; Melchert, G.D.
Title Metal removal in wetland treatment systems Type Book Chapter
Year 1994 Publication Special Publication – United States. Bureau of Mines, Report: BUMINES-SP-06A-94 Abbreviated Journal
Volume Issue Pages 80-88
Keywords acid mine drainage; cobalt; constructed wetlands; copper; flows; geochemistry; hydrology; metals; mines; Minnesota; nickel; peat; pollution; remediation; sediments; sulfides; surface water; United States; waste disposal; water quality; wetlands; zinc 22, Environmental geology
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Language Summary Language Original Title
Series Editor Series Title 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 Abbreviated Series Title
Series Volume Series Issue Edition
ISSN ISBN Medium
Area Expedition Conference
Notes Metal removal in wetland treatment systems; GeoRef; English; 2007-045160; 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: 21; illus. incl. 2 tables Approved no
Call Number CBU @ c.wolke @ 6570 Serial 391
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