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Showing 1 to 20 of 124 for “"Acid Mine Drainage"”.
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Critical Elements Recovery from Acid Mine Drainage
… heavily dependent on foreign sources of critical minerals and on foreign supply chains, resulting in the potential for strategic vulnerabilities to both economy and military. To address this problem and reduce the Nation's vulnerability to disruptions in the supply of critical minerals, it is …
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Remediation of acid mine drainage using natural zeolite
… metal solutions and real AMD from Wheal Jane mine using natural zeolite. Laboratory experiments were performed to investigate the effectiveness of natural zeolite as a potential low cost material for the removal of these heavy metals from AMD. These include, equilibrium tests, batch kinetic …
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Chemical and physical properties of acid mine drainage floc
Acid mine drainage is a serious environmental concern in many regions worldwide, but especially in coal and metal mining regions. These acid drainages are often treated with chemicals to raise the pH of the water and to cause neutralization and precipitation of metals. As neutralization occurs, a …
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Treatment of acid mine drainage with Weirton steel slags
Bed experiments were conducted to treat acid mine drainage with Weirton steel slag which contained 72.22% as Ca(OH)2 equivalent. The Acid Mine Drainage (AMD) sample was obtained from the T&T site located in northern West Virginia. The pH of the solution was 2.56 and the iron content was 89 ppm. The …
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The Neutralisation of acid mine drainage by fly ash
… results in the generation of large quantities of acid water with a high dissolved metal load. Current legislation requires this water to be collected and neutralised before being discharged. The costs involved in neutralising this effluent and safe storage of the resulting sludge can be enormous. …
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Microbiology of fly ash-acid mine drainage co-disposal processes
The waste products acid mine drainage formed during coal mining and fly ash from coal burning power generation, pose substantial environmental and economic problems for South Africa. Eskom has developed a remediation system employing alkaline fly ash to neutralize and precipitate heavy metals from …
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Characterising the acid mine drainage potential of fine coal wastes
Acid mine drainage (AMD) is one of the major environmental challenges facing the South African mining sector. Acid mine drainage has received significant public attention in recent years. South Africa's long mining history has led to a growing concern that coal-related AMD from these mines (both …
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The hydrated lime dissolution kinetics in acid mine drainage neutralization
… which could be of help in the remediation of acid mine drainage (AMD), especially in the AMD neutralization process. This is due to its ease of acquisition, affordable price and unique versatile properties such as reactivity and neutralization efficiency. AMD is an acidic wastewater containing …
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Active neutralisation and amelioration of acid mine drainage with fly ash
… with AMD in beakers and a large tank at pre-determined ratios have shown that fly ash is capable of neutralising AMD and increasing the pH beyond neutral values, which optimises the removal of heavy metals and ions. The trend was: the more fly ash added the quicker was the reaction time and higher …
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Sulfur mineralization in a wetland constructed to treat acid mine drainage
Includes bibliographical references.
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Effect of Coatings on Mineral Reaction Rates in Acid Mine Drainage
… that address the effect of coatings on rates of mineral reactions that occur in acid mine drainage (AMD) environments. The two major projects investigated how diffusion-limited transport of reactants through pore spaces in coatings on mineral grains affects the reaction rate of the underlying …
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Development of an acid mine drainage treatment technology and recovery of minerals
Acid mine drainage (AMD) is known to have negative environmental impacts due to low pH, high concentrations of toxic metals which can pollute freshwater sources. There is need for development of a technology which treats and recover beneficial minerals from AMD. Samples of AMD, water, sediments …
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Characterization and recommendations for the remediation of acid mine drainage impacted streams
… in West Virginia) has been severely impacted by Acid Mine Drainage (AMD) from surface mining operations. Water quality was monitored via water quality grab samples, in-situ water quality monitoring devices (YSI Sondes), and fish and macroinvertebrate community sampling. High concentrations of …
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The Persistence of Acid Mine Drainage at an East Texas Coal Mine
… study was to estimate the time it will take for acid forming materials (pyrite) to be weathered to a state of equilibrium and thus cease to produce acid in ground and surface waters within Oak Hill Mine. This was accomplished using an ex-situ kinetic leaching study incorporating a humidity cell …
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Organic matter remineralization in the sediment of two acid mine drainage lakes
Acid mine drainage is a significant environmental problem throughout the world. At Rocky Forks Conservation Area near Columbia, MO numerous lakes have formed from old coal mining pits. Most of these lakes have a pH near 7, presumably buffered by the limestone bedrock except one, nicknamed Red Lake, …
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The mobility of metals in acid mine drainage from abandoned coal mines
The acid mine-drainage contaminated Blesbokspruit catchment west of Witbank in Mpumalanga province, South Africa has been investigated, by analysis of its waters, sediments, precipitates and algae, to obtain an understanding of the processes which control the mobility of metals in these waters. The …
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A one-step ambient temperature ferrite process for treatment of acid mine drainage waters
Acid mine drainage (AMD) waters are low in pH, very high in dissolved iron, high in non-ferrous (mainly heavy) metals and very high in sulphate salinity. As such, AMD waters present a serious environmental problem in the mining regions of South Africa and elsewhere in the world. Treatment of AMD …
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