pyrite effects of coal mining
Pyrite, Coal, Kentucky Geological Survey, University of
Sep 17, 2019· 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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Beneficiation of pyrite from coal mining ScienceDirect
Dec 15, 2016· 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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Implications of pyritic coal dust for coal workers
Generating pyritic coal dust. Pyrite in coal can be present in a number of geological circumstances. It may be finely dispersed throughout the coal or present as coatings on cleat planes and in certain circumstances present as layers or lenses parallel to the coal banding (Figure 2a).
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Determination of the influence of pyrite on coal
Sep 01, 2019· In order to uncover the effect of pyrite on the tendency of coal to spontaneously combust, thermal analysis was carried out to characterize the reaction process of coal with different pyrite contents at four heating rates of 5, 10, 15, and 20 K min −1 in air flow from 25 to 900 °C. The Flynn-Wall-Ozawa method was applied to calculate the activation energy of coal with different pyrite
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(PDF) Effects of pyrite on the spontaneous combustion of coal
Pyrite has a significant effect on the spontaneous combustion of coal. The presence of pyrite can change the propensity of coal towards spontaneous combustion.
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Negative Effects of Coal Mining The World Counts
An example would be Acid Mine Drainage. Acidic water can flow out of abandoned coal mines. Mining has xposed rocks which contain the sulphur-bearing mineral, Pyrite. This mineral reacts to air and water to form sulphuric acid. When it rains, the diluted acid gets into rivers and streams and can even seep into underground sources of water.
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Effect of coal mine waters of variable pH on springwater
Disruption of coal strata during mining accelerates pyrite oxidation by exposing greater surface areas of the reactive mineral to weathering. Acidic water in a coal mine in the Niangziguan spring watershed is related to this process and is characterized by low pH (min. 2.52) and high sulfate (max. 4100 mg/I), iron (max. 257 mg/I), and hardness (max. 2274.45 mg/I).
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Acid mine drainage microbewiki
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.
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Effects of pyrite on the spontaneous combustion of coal
Apparently, pyrite has a positive effect on coal oxidation. Nevertheless, the relationship is a little complicated. With the addition of pyrite content in coals, the released CO during spontaneous combustion increases at the beginning and decreases after exceeding 5 %. That is to say, a maximum impact is reached when the pyrite content in coal
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Beneficiation of pyrite from coal mining ScienceDirect
Dec 15, 2016· 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.
More
(PDF) Effects of pyrite on the spontaneous combustion of coal
Pyrite has a significant effect on the spontaneous combustion of coal. The presence of pyrite can change the propensity of coal towards spontaneous combustion.
More
GROUND-WATER MOVEMENT AND EFFECTS OF COAL STRIP
Vtfhen all the pyrite has been consumed through oxidation, the quality of water in the spoil probably will begin to improve. How long this might take is not known. INTRODUCTION Strip mining of coal has a significant effect on the near-surface environment because overburden, the material above the coal
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Assessing the reactivity of pyrite
quantify any reactive pyrite contribution to coal mine heatings in a systematic and scientific manner. In 1992, the US Bureau of Mines recognised there was a deficiency in existing testing techniques and recommended that these would need to be changed to assess the effect of pyrite
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Coal workers’ pneumoconiosis how is reactive pyrite a
Harmful effects from coal dust inhalation have been well documented, but the underlying causes and mechanisms of CWP are still debatable. Several recent epidemiological studies in the United States have shown a general correlation exists between the concentration of pyrite (FeS 2) within coal and the prevalence of CWP in miners. The possible
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Effects of Moisture and Associated Pyrite on the
As compared with the raw coal sample, the effects of water and pyrite on the microstructure of anthracite were studied. The results indicate that the oxygen-containing functional group of coal
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Experiment 1 Experiment 1 The Effects of Coal Mining
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. Pyrite hypothesis = If pyrite is added to a beaker with 100mL of water, then it will reduce the pH over 48 hours.
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Frequency Distribution of the pH of Coal-Mine Drainage in
ulations demonstrate the range of effects on pH from different variables, including the amount of pyrite oxidized, buffering by carbonate minerals, and the formation of secondary minerals. Geochemistry of Coal Mine Drainage Ground water and associated mine discharges in
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Effect of coal mine waters of variable pH on springwater
Disruption of coal strata during mining accelerates pyrite oxidation by exposing greater surface areas of the reactive mineral to weathering. Acidic water in a coal mine in the Niangziguan spring watershed is related to this process and is characterized by low pH (min. 2.52) and high sulfate (max. 4100 mg/I), iron (max. 257 mg/I), and hardness (max. 2274.45 mg/I).
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University of Minnesota’s Mineral Pages: Pyrite
Pyrite is common along the borders of Minnesota, Iowa and Wisconsin, in the northern part of the Upper Mississippi River Valley lead-zinc mining district. There it occurs as vein deposits and as a disseminated replacement mineral in the region’s widespread Paleozoic carbonate rock layers.
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Effect of Pyrite Ore in Direct Coal Liquefaction Process
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
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amrclearinghouse.org :::AMD Basics PYRITE REACTIONS:::
The mineral pyrite (FeS 2) and other sulfur containing minerals are common. Also common is the occurrence of these minerals in the geologic strata in the vicinity of coal seams. Mining coal inevitably involves exposing these pyritic materials to oxygen and water. In deep mines, these materials are exposed in the voids created by the mining process.
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Effects of anthropogenic heavy metal contamination on
Coal mine drainage negatively affected leaf litter decomposition independently of leaf litter identity; no significant effect was found for wood decomposition, but sample size was low. Considering metal mine drainage, arsenic mines had a stronger negative effect on leaf litter decomposition than gold or pyrite
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