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Showing 1 to 20 of 143 for “"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
… study is to investigate the reactions of acid mine drainage (AMO) and fly ash in order to evaluate the potential for their co-disposal. A simulated AMO containing 364 mg/I Al, 355 mg/I Fe, 2782 mg/I so/- as the major ions at pH 2.5 was prepared and used in all experiments. Fresh fly ash was …
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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
… 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 high …
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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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Environmental impact of mine drainage and its treatment on aquatic communities
… analysis of eight Welsh streams impacted by mine drainage is used to discern the effects of water and sediment related variables and elucidate the most important variables in the impact of mine pollution on freshwater macroinvertebrate communities. The implications of this are to be …
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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
… 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 metal …
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The Persistence of Acid Mine Drainage at an East Texas Coal Mine
… in ground and surface waters within Oak Hill Mine. This was accomplished using an ex-situ kinetic leaching study incorporating a humidity cell in a controlled laboratory setting. Leaching was conducted on soil cores obtained from the vadose zone at Oak Hill Mine and the humidity cell was used …
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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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Mechanisms of lead and zinc removal from lead mine drainage in constructed wetland
"Constructed wetlands treating different mine drainage were designed based on one-for-all criteria instead of being customized and engineered carefully based on the characteristics of the mine drainage and wetland substrates due to lack of detailed knowledge about metal removal mechanisms. This …
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