pyrite pyrite effects of coal mining

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pyrite pyrite effects of coal mining

pyrite pyrite effects of coal mining

pyrite pyrite effects of coal mining

Effects of pyrite on the spontaneous combustion of coal

2015-9-28  Pyrite has a significant effect on the spontaneous combustion of coal. The presence of pyrite can change the propensity of coal towards spontaneous combustion. The influences of various pyrite contents on the parameters of spontaneous combustion, such as index gases, temperature and released heat etc., were investigated in this study. Coal samples with different pyrite

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Beneficiation of pyrite from coal mining ScienceDirect

2016-12-15  The pyrite from coal mining in southern Santa Catarina (Brazil) is rich in other ferrous compounds, sulfates and oxides according to the infrared spectra. The high silicon content, together with elements such as aluminum, calcium, potassium, magnesium, manganese and sodium, suggest that the material has a sandy and clay fraction.

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(PDF) Effects of pyrite on the spontaneous combustion of

In this study, samples of coal mixed with pyrite concentrate in different proportions (0, 3, 5, 7, 9, 11%) were kept in pure water for 120 days, and the effect of water immersion

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Role of pyrite in formation of hydroxyl radicals in coal

2006-12-19  The harmful effects from inhalation of coal dust are well-documented. The prevalence of lung disease varies by mining region and may, in part, be related to regional differences in the bioavailable iron content of the coal. Pyrite (FeS2), a common inorganic component in coal, has been shown to spontaneously form reactive oxygen species (ROS) (i.e., hydrogen peroxide and hydroxyl

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NIOSHTIC-2 Publications Search 10004957 Pyrite

The presence of pyrite (FeS2) in coal can cause or contribute to several problems for the coal mining industry. These problems, which include spontaneous combustion, roof falls, floor heave, and accidental explosions in coal surface mining when ammonium nitrate-fuel oil (ANFO) explosives are used, result from pyrite oxidation. Pyrite oxidizes exothermically in the presence of air and moisture to f

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Pyrite, Coal, Kentucky Geological Survey, University of

2019-9-17  Pyrite (FeS 2) is the most common sulfide mineral in coal and a major source of the sulfur in coal.Pyrite can form in peat while the peat is accumulating, or can form in peats from the introduction of sulfate (SO 4) into the peat if the peat was buried by marine waters (such pyrite is called syngenetic or authigenic pyrite).Within the buried peat, the sulfate is reduced to sulfide (S 2), which

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Valorization of waste from coal mining pyrite

2021-8-1  The coal mining industries generate a considerable volume of pyrite-rich tailings (FeS 2).However, pyrite waste is potentially reusable. Therefore, this study aimed to evaluate possible ways of waste and effluent valorization that are generated during the processing of coal mining pyrite (R1).

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Preferential oxidation of pyrite as a function of

2018-6-12  Economic coal seams within the Buller coalfield are associated with the Brunner Coal Measures (BCM), which geographic basis within the coal mining area and is also the effects of pyrite morphology on acid generation rates

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(PDF) Purification Route of Pyrite from Coal Mining

2016-7-31  Pyrite, mineral largely found in nature, is considered a solid waste when is obtained from the coal mining. However, can be precursor of products like: sulphur, sulphuric acid, hematite, sulphur

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Investigation of pyrite oxidation and acid mine drainage

2010-2-3  Pyrite oxidation and AMD generation are important processes that may take place within the wastes produced by coal mining and coal washing operations in the Golestan province (northeast Iran). The study area is characterized by appropriate atmospheric conditions that favor pyrite oxidation and the presence of a large amount of water bodies.

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Role of pyrite in formation of hydroxyl radicals in coal

2006-12-19  Pyrite has recently been shown to spontaneously generate hydrogen peroxide (H 2 O 2) [32,33] and hydroxyl radicals (• OH) [23,24] when placed in water.The formation of these reactive oxygen species (ROS) also explains the recent observation that aqueous pyrite slurries degrade yeast RNA, ribosomal RNA, and DNA [].Pyrite is thought to form H 2 O 2 through the iron-catalyzed Haber-Weiss

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Role of pyrite in formation of hydroxyl radicals in coal

2006-12-19  The harmful effects from inhalation of coal dust are well-documented. The prevalence of lung disease varies by mining region and may, in part, be related to regional differences in the bioavailable iron content of the coal. Pyrite (FeS2), a common inorganic component in coal, has been shown to spontaneously form reactive oxygen species (ROS) (i.e., hydrogen peroxide and hydroxyl

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Effect of Pyrite Ore in Direct Coal Liquefaction Process

2020-8-4  The catalytic activity of pyrite ore from coal mining was studied in the direct liquefaction process of high volatile bituminous coal from the south of Brazil. The process consisted of mixing pulverized coal with tetralin in the presence of catalyst. It was possible to obtain fractions of preasphaltenes, asphaltenes, and oils.

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The Effect of Carbon Defects in the Coal–Pyrite Vacancy on

Pyrite is a mineral often associated with coal in coal seams and is a major source of sulfur in coal. Coal–pyrite is widely distributed, easily available, low-cost, and non-toxic, and has high light absorption coefficient. So, it shows potential for various applications. In this paper, the density-functional theory (DFT + U) is used to construct coal–pyrite with carbon doped in the

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Solution-Effect of pyrite and coal on the acidity of water

Lab 4 Energy Sources and Alternative Energy Experiment 1: The Effects of Coal Mining Table 1: pH of Water Samples Water Sample Initial pH Final pH (24-48 hours) Pyrite 6 6 Activated Carbon 6 7 Water 6 6 POST LAB QUESTIONS 1. Develop hypotheses predicting the

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Evaluation of factors affecting pyrite oxidation and

2010-10-10  Evaluation of factors affecting pyrite oxidation and subsequent pollutant generation in backfilled open cut coal mines R. N. Singh Professor of Mining Engineering, Faculty of Engineering, University of Wollongong Northfields Avenue, Wollongong, NSW 2522, Australia. THE EFFECT OF OXYGEN DIFFUSION

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Effects of Moisture and Associated Pyrite on the

2021-1-23  Sulfur exists in coal in the form of pyrite, sulfate, and organic sulfur, among which pyrite has the greatest impact on coal spontaneous combustion.25 Deng et al.26 found that under the separate action of different microstructure contents and pyrite, low-temperature oxidation can enhance the apparent activation energy of coal.

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Pyrite Formation in Organic‐rich Clay, Calcitic and Coal

2010-9-7  Abstract The early diagenetic characteristics of pyrite formation processes in a Miocene freshwater sequence of mixed sediments (coal fragments in clays, sandstones or shales) alternating with continuous brown coal layers was investigated. Based on abundant minerals, the following main sedimentary environments were distinguished: the illite-montmorillonitic (I-M), calcitic (Ct) and coal

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Microscopic varieties of pyrite in West Virginia coals

2021-10-31  Microscopic analysis by reflected light was performed on 29 polished microblocks of particulate coal representing 22 major coal seams in West Virginia. Pyrite was classified into four groups in the study: massive, typically single grains, irregular in shape, found in coal cavities or fractures; patches, lenticular or irregular and composed of

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A study on the effect of active pyrite on flotation of

2018-6-27  A study on the effect of active pyrite on flotation of porphyry copper ores Nahid Molaei 1, Fatemeh Sadat Hoseinian 2, Bahram Rezai 2 1 Department of Mining Engineering, Research and Science Campus, Islamic Azad University, Poonak, Hesarak Tehran, Iran

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Role of pyrite in formation of hydroxyl radicals in coal

2006-12-19  Pyrite has recently been shown to spontaneously generate hydrogen peroxide (H 2 O 2) [32,33] and hydroxyl radicals (• OH) [23,24] when placed in water.The formation of these reactive oxygen species (ROS) also explains the recent observation that aqueous pyrite slurries degrade yeast RNA, ribosomal RNA, and DNA [].Pyrite is thought to form H 2 O 2 through the iron-catalyzed Haber-Weiss

get price

Role of pyrite in formation of hydroxyl radicals in coal

2006-12-19  The harmful effects from inhalation of coal dust are well-documented. The prevalence of lung disease varies by mining region and may, in part, be related to regional differences in the bioavailable iron content of the coal. Pyrite (FeS2), a common inorganic component in coal, has been shown to spontaneously form reactive oxygen species (ROS) (i.e., hydrogen peroxide and hydroxyl

get price

NIOSHTIC-2 Publications Search 10004957 Pyrite

The presence of pyrite (FeS2) in coal can cause or contribute to several problems for the coal mining industry. These problems, which include spontaneous combustion, roof falls, floor heave, and accidental explosions in coal surface mining when ammonium nitrate-fuel oil (ANFO) explosives are used, result from pyrite oxidation. Pyrite oxidizes exothermically in the presence of air and moisture to f

get price

Minerals Free Full-Text Effects of Pyrite Texture on

2 天前  Pyrite particles, having framboidal/altered texture, are known to significantly affect pulp chemistry and adversely affect flotation performance. Therefore, the main objectives of this study were to demonstrate influence of pyrite mineralogy on the flotation of copper (sulphidic) ores and develop alternative conditions to improve the performance.

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The Effect of Carbon Defects in the Coal–Pyrite Vacancy on

Pyrite is a mineral often associated with coal in coal seams and is a major source of sulfur in coal. Coal–pyrite is widely distributed, easily available, low-cost, and non-toxic, and has high light absorption coefficient. So, it shows potential for various applications. In this paper, the density-functional theory (DFT + U) is used to construct coal–pyrite with carbon doped in the

get price

(PDF) The thermal treatment study of pyrite from South

PDF The coal mining have been produced two effects: the region development and the environmental degradation by the pyrite (FeS2) oxidation and acid Find, read and cite all the research you

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Effects of Moisture and Associated Pyrite on the

2021-1-23  Sulfur exists in coal in the form of pyrite, sulfate, and organic sulfur, among which pyrite has the greatest impact on coal spontaneous combustion.25 Deng et al.26 found that under the separate action of different microstructure contents and pyrite, low-temperature oxidation can enhance the apparent activation energy of coal.

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Effect of Phospholipid on Pyrite Oxidation and Microbial

The effect of phospholipid on the biogeochemistry of pyrite oxidation, which leads to acid mine drainage (AMD) chemistry in the environment, was investigated. Metagenomic analyses were carried out to understand how the microbial community structure, which developed during the oxidation of pyrite-containing coal mining overburden/waste rock (OWR

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A study on the effect of active pyrite on flotation of

2018-6-27  A study on the effect of active pyrite on flotation of porphyry copper ores Nahid Molaei 1, Fatemeh Sadat Hoseinian 2, Bahram Rezai 2 1 Department of Mining Engineering, Research and Science Campus, Islamic Azad University, Poonak, Hesarak Tehran, Iran

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Pyrite Bartleby

Sources and Alternative Energy Experiment 1: The Effects of Coal Mining Table 1: pH of Water Samples Water Sample Initial pH Final pH (24-48 hours) Pyrite 6 4 Activated Carbon 7 8 Water 7 7 POST LAB QUESTIONS 1. Develop hypotheses predicting the effect of pyrite and coal on the acidity of water? a.

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