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Acid Mine Formation

Acid Mine Formation

Introduction :Acid mine drainage (AMD) formation and toxic arsenic (As) contamination are serious environmental problems encountered worldwide. In this study, we investigated the crucial roles played by common secondary mineral phases formed during the natural weathering of pyrite-bearing wastes-soluble salts (melanterite, FeSO 4 7H 2 O) and metal oxides (hematite, Fe 2 O 3)-on AMD formation and As

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Acid mine drainage formation, control and treatment

Acid mine drainage (AMD) is a worldwide concern in coal and metal mining. • Mine planners must predict AMD potential before disturbance. • If AMD is predicted, planners must install control measures such as spoil handling plans, alkaline amendment, and covers. • Treatment of AMD uses chemicals such as Ca(OH) 2, CaO, NaOH, Na 2 CO 3, and NH 3. It is costly, requires equipment and facilities, and

Nov 15, 2020 Acid mine drainage (AMD)—the very acidic and highly contaminated leachate generated in underground workings of closed/abandoned mine sites (Igarashi et al., 2020; Marove et al., 2020; Tomiyama et al., 2019) as well as from waste rocks and tailings of mineral processing and coal cleaning operations (Naidu et al., 2019; Park et al., 2018a)—is one of the oldest and probably the most serious

Jan 01, 2019 Acid mine drainage formation, control and treatment: Approaches and strategies 1. Introduction: acid mine drainage formation. Acid mine drainage (AMD) forms when sulfide minerals deep in the earth 2. Overburden analyses, handling and placement. Control of AMD before land disturbance requires an

Acid mine drainage formation, control and treatment

Acid mine drainage formation, control and treatment

Acid mine drainage formation and arsenic mobility under strongly acidic conditions: Importance of soluble phases, iron oxyhydroxides/oxides and nature of oxidation layer on pyrite.

CR Scientific: Some Chemistry of Acid Mine Drainage

Some Chemistry of Acid Mine Drainage (AMD) 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

Aug 26, 2010 Acid mine drainage (AMD) occurs when metal sulfides, most commonly pyrite, are exposed to and react with air and water. When water flows over or through sulfur-bearing mine tailings, a chemical reaction occurs between the water and rocks resulting in metal-rich water. AMD typically has a bright orange, yellow, or bownish-red color to it.

Jul 14, 2020 Acid mine drainage forms when sulfide minerals are exposed to oxidizing conditions in coal and metal mining, highway construction and other large-scale excavations. There are many types of sulfide minerals. Iron sulfides common in coal regions are predominately pyrite and marcasite (FeS 2 ), but other metals may be complexed with sulfides like

Based on the knowledge obtained from acid mine drainage formation in mine waste environments (tailings impoundments and waste rock dumps), a new methodology is applied to characterize new ore deposits before exploitation starts. This gives the opportunity to design optimized processes for metal recovery of the different mineral assemblages in an ore deposit and at the same time to minimize the

Biogeometallurgical pre-mining characterization of ore

Biogeometallurgical pre-mining characterization of ore

An Explanation of Acid Mine Drainage - Treehugger

Nov 13, 2019 Where Acid Mine Drainage Happens . It mostly occurs where mining is done to extract coal or metals from sulfur-bearing rocks. Silver, gold, copper, zinc,

A bacterium, Thiobacillus ferrooxidans, is of prime importance in the formation of acid drainage from pyritic material. Above pH 4.5, T. ferrooxidans increases initial acidification; below pH 4.5

Schwertmannite formation and transformation, key processes that influence the speciation, mobility, and environmental fate of associated trace elements in acid mine drainage (AMD), were primarily studied through Fe2+ oxidation–hydrolysis. Direct Fe3+ hydrolysis is another important schwertmannite formation p Environmental fate of nanomaterials

Alkalinity Capability of water to neutralize acid Important to aquatic life Buffers against rapid pH change Often related to hardness Hardness is the concentration of divalent cations (e.g., Ca2+, Mg2+) Water-quality criteria for some metals are hardness-dependent In mining impacted systems, Ca2+, Mg2+, etc. can originate from the weathering of a variety of minerals

(PDF) Acid mine drainage formation, control and treatment

Acid mine drainage formation, control and treatment: Approaches and strategies. Download. Acid mine drainage formation, control and treatment: Approaches and strategies. Jeff Skousen. Related Papers. Acid Mine Drainage Control and Treatment. By Jeffrey

(PDF) Acid mine drainage formation, control and treatment

(PDF) Acid mine drainage formation, control and treatment

The basic EIA steps include screening, scoping, impact prediction and evaluation, mitigation and follow-up studies for implemented projects to provide feedback (Noble, 2011; Castilla- Gomez and Herrera-Herbert, 2015). The potential for acid mine drainage (AMD) to form at mine sites is one of the key questions to be answered in an EIA process.

The formation of mine acid drainage and the contaminants associated with it has been described by some as the largest environmental problem facing the U.S. mining industry (U.S. Forest Service 1993, Ferguson and Erickson 1988, Lapakko 1993b). Commonly referred to as acid rock drainage (ARD) or acid mine drainage

The current level of knowledge of acid mine drain- age formation is critically reviewed, with emphasis on reaction kinetics and reactant and product transport. A reaction system model is developed which provides a conceptual framework for sub- sequent discussion dealing specifically with the physical, chemical, and biological characteristics of

Simultaneous suppression of acid mine drainage formation

Pyrite (FeS 2), the most common sulfide mineral in nature, plays an important role in the formation of acid mine drainage (AMD), one of the most serious environmental problems after the closure of mines and mineral processing operations.Likewise, arsenopyrite (FeAsS) is an important sulfide mineral because its dissolution releases toxic arsenic (As) into the environment.

Acid mine drainage formation, control and treatment: Approaches and strategies. Download. Acid mine drainage formation, control and treatment: Approaches and strategies. Jeff Skousen. Related Papers. Acid Mine Drainage Control and Treatment. By Jeffrey

(PDF) Acid mine drainage formation, control and treatment

(PDF) Acid mine drainage formation, control and treatment

A bacterium, Thiobacillus ferrooxidans, is of prime importance in the formation of acid drainage from pyritic material. Above pH 4.5, T. ferrooxidans increases initial acidification; below pH 4.5

The basic EIA steps include screening, scoping, impact prediction and evaluation, mitigation and follow-up studies for implemented projects to provide feedback (Noble, 2011; Castilla- Gomez and Herrera-Herbert, 2015). The potential for acid mine drainage (AMD) to form at mine sites is one of the key questions to be answered in an EIA process.

Simultaneous suppression of acid mine drainage formation

Pyrite (FeS 2), the most common sulfide mineral in nature, plays an important role in the formation of acid mine drainage (AMD), one of the most serious environmental problems after the closure of mines and mineral processing operations.Likewise, arsenopyrite (FeAsS) is an important sulfide mineral because its dissolution releases toxic arsenic (As) into the environment.

Schwertmannite formation and transformation, key processes that influence the speciation, mobility, and environmental fate of associated trace elements in acid mine drainage (AMD), were primarily studied through Fe2+ oxidation–hydrolysis. Direct Fe3+ hydrolysis is another important schwertmannite formation p Environmental fate of nanomaterials

Alkalinity Capability of water to neutralize acid Important to aquatic life Buffers against rapid pH change Often related to hardness Hardness is the concentration of divalent cations (e.g., Ca2+, Mg2+) Water-quality criteria for some metals are hardness-dependent In mining impacted systems, Ca2+, Mg2+, etc. can originate from the weathering of a variety of minerals

Fundamentals of Mine-Drainage Formation and

Fundamentals of Mine-Drainage Formation and

Jul 01, 2003 A critical stage in the formation of acid mine drainage: Colonization of pyrite by Acidithiobacillus ferrooxidans under pH-neutral conditions Randall E. Mielke, Department of Biological Sciences, Northern Arizona University, Flagstaff, AZ 86011-5640, USA .

Consequences of acid mine drainage for the structure and

Jeffrey G. Skousen, Paul F. Ziemkiewicz, Louis M. McDonald Acid mine drainage formation, control and treatment: Approaches and strategies, The Extractive Industries and

Acid mine drainage (AMD) is the runoff produced when water comes in contact with exposed rocks containing sulfur-bearing minerals that react with water and air to form sulfuric acid and dissolved iron. This acidic run-off dissolves heavy metals including copper,

Download Citation | On Jan 4, 2021, Geoffrey S. Simate published Chemistry of Acid Mine Drainage Formation | Find, read and cite all the research you need on ResearchGate

Acid Mine Drainage (AMD) is currently the main pollutant of surface water in the mid-Atlantic region. AMD is caused when water flows over or through sulfur-bearing materials forming solutions of net acidity. AMD comes mainly from abandoned coal mines and currently active mining. AMD degrades more than 4,500 stream miles

EPA - What is Acid Mine Drainage

EPA - What is Acid Mine Drainage

The Formation of Acid Mine Drainage | Request PDF

This chapter unpacks and broadens the understanding of the acid mine drainage (AMD) challenge. The chapter defines and describes the origin and chemistry of the complex formation processes of AMD

Schwertmannite formation and transformation, key processes that influence the speciation, mobility, and environmental fate of associated trace elements in acid mine drainage (AMD), were primarily studied through Fe2+ oxidation–hydrolysis. Direct Fe3+ hydrolysis is another important schwertmannite formation p Environmental fate of nanomaterials