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Mine water, acid mine drainage and ochre As coal mining in the UK has reduced, some arrangements to pump water out of the mines have stopped. This has allowed iron, found in the rocks within mine workings, to mix with underground water. As this mine water reaches the surface it comes into contact with the air and a chemical reaction takes place.
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Although many different biological and chemical technologies exist for treatment of acid mine drainage, lime neutralisation remains by far the most widely applied method.
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Mine drainage forms from a chemical reaction between water and rocks containing sulfurbearing minerals. The resulting waters become rich in sulfuric acid and dissolved iron. As the iron settles out of the water, it can form red, orange, or yellow sediments in the bottom of streams.
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Acid Mine Drainage Acid drainage occurs when minerals containing reduced forms of sulfur (S) oxidize via exposure to oxygen and water during earth disturbances (Figure 1). In coalmining areas, the most common of these minerals is iron pyrite (FeS 2). Using FeS 2 as an example, AMD for mation can be represented as follows: FeS 2 (s) + O 2
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Acid mine drainage, commonly referred to as AMD, is a pervasive problem in many areas of the fact, it is considered one of the main pollutants of surface water in the eastern United States. Characterized by high levels of acid, sulfate, and metals, AMD exerts both lethal and sublethal effects on aquatic life, pollutes drinking water, and corrodes manmade structures, including barges
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Acid mine drainage (AMD) has been a detrimental byproduct of coal mining for many years. At present, acid mine drainage continues to pose a potential problem in some areas, despite improved prediction and prevention techniques. Acid Mine Drainage Research Acid mine drainage (AMD) has been the subject of intensive research since the 1960''s
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Acid Mine Drainage (AMD) is a major environmental hazard of 20th century mining practice. The controlling parameters are defined by the physics of the site. The chemistry is complex and not completely identified. Some Australian work using 18 O in near isotopically pure O 2 and H 2 O has identified the general direction of the reaction path.
WhatsApp (Durkin Herrmann 1994). Chemical additives can have other complications with their use, such as vegetative effects caused by a chemical additive, and, again may require several reapplications. Microorganisms, which remove metals from mine drainage, can be added to AMD afflicted areas (Durkin Herrmann 1994).
WhatsApp · The formation of acid mine drainage (AMD), a highly acidic and metalrich solution, is the biggest environmental concern associated with coal and mineral mining. Once produced, AMD can severely impact the surrounding ecosystem due to its acidity, metal toxicity, sedimentation and other deleterious properties. Hence, implementations of effective postmining management practices are
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mines and tailings piles showed pH interval and chemical concentrations similar to those of mine drainage. However, the river and ground water samples of municipal public water supplies revealed a pH range from to and low chemical concentrations,
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acid drainage is traditionally referred to as "acid mine drainage" or "acid rock drainage". The term AMD in this paper encompasses acid (ie. low pH) drainage formed by sulphide oxidation resulting from mining activities, as well as metalliferous drainage, which may have a nearneutral or acidic pH.
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Summary. Acid mine drainage (AMD) refers to the outflow of acidic water from a mining site. In most cases, this acid comes primarily from oxidation of iron sulfide (FeS2, also known as pyrite or "fool''s gold"), which is often found in conjunction with valuable metals. Acid mine drainage is a major problem with many hardrock mines, including almost all mines where the metal ore is bound up with
WhatsApp Water Pollution: Acid Mine Drainage: Chemistry Groundwater often flows through the cracks in the crushed sulfides, or sulfurrich minerals, that remain after an area has been mined. One of the most important sulfides found in the waste rock of mines is iron sulfide or pyrite (FeS 2).
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Acid Mine Drainage Prediction compares acid rock drainage factors of waste rock piles and tailings impoundments. In examining this table, it is important to note that diffusion of oxygen into water is slow and, therefore, oxidation of iron sulfide is inhibited until the water level drops, which can occur periodically or seasonally in some cases.
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Acid mine drainage (AMD) is one of the most important environmental problems facing the mining industry. Drainage waters are generated by chemical and microbiological reactions that occur simultaneously when sulphide minerals like pyrite (FeS2) are exposed to oxygen and water. Such exposure produces acid that may dissolve relatively
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Metal Removal Processes of Wetlands A wetland environment can remove metals from influent waters in a variety of ways. As chemical oxidation takes place, oxides and hydroxides of iron can be expected to precipitate from surface flow, resulting in the characteristic yellow sediment in mine drainage known as "yellow boy". These precipitates coat the surfaces of the bottom or settle as a
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· This paper describes Acid Mine Drainage (AMD) generation and its associated technical issues. As AMD is recognized as one of the more serious environmental problems in the mining industry, its causes, prediction and treatment have become the focus of a number of research initiatives commissioned by governments, the mining industry, universities and research establishments, with
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· In a nutshell, acid mine drainage is a form of water pollution that happens when rain, runoff, or streams come in contact with rock that is rich in sulfur. As a result, the water becomes very acidic and damages downstream aquatic ecosystems. In some regions, it is the most common form of stream and river pollution.
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Introduction The mining of coal deposits and metal ores often results in a phenomenon called "acid mine drainage" (AMD). This results primarily from the oxidative breakdown of transition metal sulfides, especially pyrite (FeS 2).There is actually a complex series of reactions and side reactions, but the net equation is often written according to Equation 1:
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Acid Mine Drainage Acid Mine Drainage. Acid mine drainage (AMD) is typically characterized by low pH and high dissolved iron. The acid mine drainage may also contain high amounts of CO2 which forms carbonic acid and further depresses the pH. There are four chemical reactions that represent the chemistry of pyrite weathering to form acid mine
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REMOVAL OF MANGANESE FROM ACID MINE DRAINAGE Raymond J. Lovett Department of Chemistry West ia University Morgantown, WV 26506 I. INTRODUCTION Manganese is a common component of both neutral and acid mine drainage. Certain southern West ia drainages which are not acidic contain more than the maximum allowable
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Acid mine drainage (AMD), which can have pH values as low as – Concerns associated with acidic coalmine drainage include sedimentation of chemical precipitates, soil erosion, and loss of aquatic habitats in contact with waters with highmetal loads (Williams et al., 2002).
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General equations for this process are: 2FeS. 2 chemical reactions forming AMD occur at a faster rate. This acid is sometimes naturally diluted or. However, acid mine drainage eventually leaves its mark. Water samples are collected to determine the extent of acid mine drainage.
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Title: Acid Mine Drainage Overview Author: dneuman Created Date: 7/15/2008 11:13:23 AM
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