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Mitchell, P.; Wheaton, A. |
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From environmental burden to natural resource; new reagents for cost-effective treatment of, and metal recovery from, acid rock drainage |
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1999 |
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Sudbury '99; Mining and the environment II; Conference proceedings |
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acid mine drainage Bunker Hill Mine cost decontamination Idaho metal ores mines mitigation natural resources pollution reagents recovery Shoshone County Idaho sludge United States zinc ores 22 Environmental geology 27A Economic geology, geology of ore deposits |
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Abstract |
Acid rock drainage remains the greatest environmental issue faced by the mining sector and as the new millennium approaches, low capital/operating cost treatments remain elusive. Therefore as part of an ongoing process to develop a leading edge, innovative and cost-effective approach, pilot trials were conducted by KEECO in collaboration with the New Bunker Hill Mining Company on a substantial and problematic metal-contaminated acid flow, emanating from underground workings at the Bunker Hill Mine, Idaho. The aims of the work were fourfold. First to assess the capacity of KEECO's unique Silica Micro Encapsulation (SME) reagents and associated dosing systems to cost-effectively decontaminate the acid flow to stringent standards set by the U.S. Environmental Protection Agency (USEPA), where alternative and standard technologies had failed. Second, to demonstrate that treatment using a compact system suitable for underground installation. Third, to demonstrate that the treatment sludge had enhanced chemical stability in absolute terms and relative to standard approaches. Fourth, to examine the potential for resource recovery via sequential precipitation. Although the focus to date has been the development of a cost-effective treatment technology, the latter aim was considered essential in light of the growing pressure on all industrial sectors to develop tools for environmentally sustainable economic growth and the growing demands of stakeholders for improved resource usage and recycling. Two phases of work were undertaken: a laboratory-based scoping exercise followed by installation within the mine workings of a compact reagent delivery/shear mixing unit capable of treating the full flow of 31 L s (super -1) . At a dose rate of 2.0 g L (super -1) (equivalent to a final treated water pH range of 7-9), the SME reagent KB-1 reduced metal concentrations to levels approaching the U.S. Drinking Water Standards, which no other treatment piloted at the site had achieved. Based on the USEPA's Toxicity Characteristic Leaching Procedure, the sludge arising from the treatment was classified as non-hazardous. Operating costs compared favourably with those of lime use, while estimated capital costs were considerably lower due to the compact nature of the reagent delivery system and the rapid settling characteristics of the treatment sediment. Resource recovery was attempted using a two-stage selective precipitation approach. The first stage involved pH adjustment to 5.5 (by addition of 1.5 g L (super -1) of KB-1) to produce a sludge enriched in aluminium, iron and manganese, with lesser amounts of arsenic, nickel, lead and zinc. Further KB-1 addition to a total of 2.1 g L (super -1) generated sludge enriched in zinc (33% by dry weight), demonstrating that resource recovery is theoretically feasible. Further work on downstream processing is required, although it is considered that the most likely route for zinc metal recovery will be high temperature/pressure due to the chemically inert nature of the zinc-rich sediment. |
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Goldsack, D.E.; Belzile, N.; Yearwood, P.; Hall, G.J. |
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0886670470 |
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From environmental burden to natural resource; new reagents for cost-effective treatment of, and metal recovery from, acid rock drainage; GeoRef; English; 2000-048642; Sudbury '99; Mining and the environment II, Sudbury, ON, Canada, Sept. 13-17, 1999 References: 3; illus. incl. 5 tables |
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CBU @ c.wolke @ 16593 |
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296 |
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Author |
Miller, S.D. |
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Title |
Overview of acid mine drainage issues and control strategies Remediation and management of degraded lands |
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1999 |
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acid mine drainage; controls; decontamination; environmental analysis; environmental effects; geochemistry; ground water; land management; lime; oxidation; pH; pollutants; pollution; preventive measures; risk assessment; soils; sulfides; surface water; waste disposal; waste management 22, Environmental geology |
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Lewis Publishers |
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Boca Raton |
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Wong, M.H.; Wong, J.W.C.; Baker, A.J.M. |
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157504109x |
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Overview of acid mine drainage issues and control strategies Remediation and management of degraded lands; GeoRef; English; 2000-057936 |
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CBU @ c.wolke @ 5951 |
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298 |
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Meek, F.A., Jr.; Skousen, J.G.; Ziemkiewicz, P.F. |
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Title |
Evaluation of acid prevention techniques used in surface mining |
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1996 |
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Acid mine drainage control and treatment |
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acidic composition; acidification; Allegheny Mountains; Appalachians; central West Virginia; coal mines; controls; environmental analysis; environmental management; ground water; lime; mines; North America; phosphates; pollution; preventive measures; reclamation; remediation; spoils; surface water; United States; Upshur County West Virginia; water quality; water treatment; West Virginia 22, Environmental geology |
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West Virginia University and the National Mine Land Reclamation Center |
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Morgantown |
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Evaluation of acid prevention techniques used in surface mining; GeoRef; English; 2004-051150; Edition: 2 References: 5; illus. incl. 2 tables |
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CBU @ c.wolke @ 6360 |
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301 |
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McConchie, D.M.; Clark, M.; Hanahan, C.; Baun, R. |
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New treatments for the old problems of acid mine drainage and sulphidic mine tailings storage |
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2000 |
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acid mine drainage; ash; carbonate rocks; clastic sediments; construction materials; crushed stone; hydroxides; iron hydroxides; iron oxides; mines; mud; oxides; pH; pollution; reclamation; red mud; remediation; sea water; sedimentary rocks; sediments; storage; sulfides; tailings; waste management 22, Environmental geology |
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Programme & Abstracts - International Symposium on Environmental Geochemistry (ISEG), vol.5 |
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5th international symposium on Environmental geochemistry; conference abstracts and scientific programme |
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2006-033067; 5th international symposium on Environmental geochemistry, Cape Town, South Africa, April 2004; GeoRef; English |
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CBU @ c.wolke @ 5858 |
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304 |
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Kingham, N.W.; Semenak, R.; Powell, G.; Way, S. |
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Reverse osmosis coupled with chemical precipitation treatment of acid mine leachate at the Basin-Luttrell Pit, Ten Mile Creek Site, Lewis and Clark County, Montana Hardrock mining 2002; issues shaping the industry |
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2002 |
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acid mine drainage; Basin-Luttrell Pit; cost; environmental effects; leachate; Lewis and Clark County Montana; metals; Montana; osmosis; pollutants; pollution; precipitation; reverse osmosis; soils; sulfates; tailings; Ten Mile Creek; United States; waste rock; waste water; water treatment 22, Environmental geology |
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Reverse osmosis coupled with chemical precipitation treatment of acid mine leachate at the Basin-Luttrell Pit, Ten Mile Creek Site, Lewis and Clark County, Montana Hardrock mining 2002; issues shaping the industry; GeoRef; English; 2007-046128; Hardrock mining 2002; issues shaping the industry, Westminster, CO, United States, May 7-9, 2002 U. S. Environmental Protection Agency, Office of Research and Development, Washington, DC, United States |
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CBU @ c.wolke @ 5610 |
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331 |
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