2009-8-27 Analysis of surface modification on coal pyrite Continuous scanning, speed 2°/min Sampling interval 0.02°. Results and discussion Figures 4–6 show the diffraction patterns of fresh, initially oxidized, and electrochemically reduced coal pyrite. The patterns show the following features: The characteristic of FeS2 is the strong peaks at
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Coal desulphurization by flotation is often difficult due to the surface oxidation of coal pyrite. Scanning electron microscope (SEM) and X-ray diffraction (XRD) were adopted to obtain detailed information about the surface oxidation of pyrite. ...
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Download Citation Analysis of surface modification on coal pyrite Coal desulphurization by flotation is often difficult due to the surface oxidation of coal pyrite. Scanning electron ...
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2021-10-18 The SAIMM is a professional institute with local and international links aimed at assisting members source information about technological developments in
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Investigation of mechanisms for the control of coal and pyrite surfaces prior to fine coal flotation is an important aspect of the project objectives. A second major objective is to investigate factors involved in the progressive weathering and oxidation of three base coals stored in three storage more » modes, namely, open, covered and in an ...
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2017-4-19 Through XRD and XRF analysis, there were some minerals including quartz, kaolinite, illite and pyrite in the coking coal, so H + from the acid could react with minerals and other inorganic compounds which were progressively exposed on the surface and within pores of the coal particles (Seidel Zimmels 1998). The relevant chemical reactions can ...
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2020-7-25 The contact angle of diethyl phthalate droplet on the pyrite surface is obviously larger than that on the coal surface in ultrapure water. After acid treatment, the contact angle of reagent droplets on pyrite greatly decreased, while the contact angle on coal increased from 57.2° to 70.9°.
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2020-4-15 To study the modification of the physicochemical characteristics of acidified coal by surfactants and ionic liquids, N 2 adsorption, scanning electron microscopy and so on, combined with fractal theory were used. The results show that when the coal sample is treated with HNO 3, a large number of corrosion pores can be generated, and the aromaticity of the coal can be improved.
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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
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2006-10-9 Surface Areas and Pore Volumes of Coal Macerals, Fuel Vol 47 331-332. Surface Areas of Coals, Fuel Vol 47 322-324. Thermoelectric Power and Internal Friction of Some Graphitic Carbons, Tanso No 54 99-101 . 1969 The Effect of Oxygen
More2021-10-18 The SAIMM is a professional institute with local and international links aimed at assisting members source information about technological developments in
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1997-2-1 Surface Spectroscopic Studies of Factors Influencing Xanthate Adsorption on Coal Pyrite Surfaces Surface Spectroscopic Studies of Factors Influencing Xanthate Adsorption on Coal Pyrite Surfaces Baltrus, John P.; Diehl, J. Rodney 1997-02-01 00:00:00 US Department of Energy, Pittsburgh Energy Technology Center, PO Box 10940, Pittsburgh, PA 15236-0940, USA The relative adsorption
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(b) adapting said culture from step (a) to pyrite as a nutrient medium and to coal-pyrite surface modification conditions by slurring the bacteria of said culture from step (a) with -200 mesh pyrite, or -200 mesh coal pyrite of a pyrite content of about 60 percent, and stirring and aerating for at least six weeks at a pH level below about 4.0 ...
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Analysis of surface modification on coal pyrite - saimm. The Journal of The South African Institute of Mining and Metallurgy ... techniques for coal desulphurization. ... with the use of these techniques to control the. Read more
More2018-6-10 Modification of the pulverization proc-ess offers a promising means of reducing the sulfur content of coal prior to its be-ing burned. For this to be possible, however, practical methods are needed (a) for liberating the pyrite present in coals, and (6) for removing the pyrite once it has been liberated. This is believed possible if advantage ...
More2015-9-28 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
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2021-4-14 Coal characteristics Physical and chemical properties. With the exception of sample J, which consisted of concentrated pyrite associated with a non-coal band of the coal seam, all samples were ...
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elements dissolved in surface and ground waters is one of the main problems associated with acid drainage generated in coal and sulfide mining areas. Acid mine drainage (AMD) results from the oxidation of sulfides, typically pyrite, and is characterized by low pH and high concentrations of SO 4 2–, Fe, metalloids, and many metals (Larsen
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2013-7-9 In the present investigation, two coal samples were obtained from a typical Australian coal flotation plant using saline water and examined to identify surface chemistry effects on fine coal flotation which is an important issue confronting the coal industry. The speciation modeling indicated that hydrophilic precipitates may occur in the flotation circuits as a result of the use of high ionic ...
More2006-10-9 Surface Areas and Pore Volumes of Coal Macerals, Fuel Vol 47 331-332. Surface Areas of Coals, Fuel Vol 47 322-324. Thermoelectric Power and Internal Friction of Some Graphitic Carbons, Tanso No 54 99-101 . 1969 The Effect of Oxygen
More2018-6-10 Modification of the pulverization proc-ess offers a promising means of reducing the sulfur content of coal prior to its be-ing burned. For this to be possible, however, practical methods are needed (a) for liberating the pyrite present in coals, and (6) for removing the pyrite once it has been liberated. This is believed possible if advantage ...
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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 coalndash;pyrite with carbon doped in the ...
More2013-7-9 In the present investigation, two coal samples were obtained from a typical Australian coal flotation plant using saline water and examined to identify surface chemistry effects on fine coal flotation which is an important issue confronting the coal industry. The speciation modeling indicated that hydrophilic precipitates may occur in the flotation circuits as a result of the use of high ionic ...
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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
Moreelements dissolved in surface and ground waters is one of the main problems associated with acid drainage generated in coal and sulfide mining areas. Acid mine drainage (AMD) results from the oxidation of sulfides, typically pyrite, and is characterized by low pH and high concentrations of SO 4 2–, Fe, metalloids, and many metals (Larsen
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2010-4-26 Pyrite (FeS 2), the most common metal sulfide mineral associated with coal and metal mine waste, has been shown to generate hydrogen peroxide (H 2 O 2) [1, 2] and hydroxyl radicals (• OH) [3, 4] when placed in water.In the presence of dissolved molecular oxygen, ferrous iron associated with pyrite can form superoxide anion (O 2 •)-(eq. 1), which reacts with ferrous iron to form H 2 O 2 (eq ...
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2007-3-7 Coal Properties, Sampling Ash Characteristics by Rod Hatt Coal Combustion, Inc . Versailles, KY 859-873-0188 Introduction The Powder River Coal is classified as sub -bituminous ranked coal. Coal rank is an indication of how much transformation the orig inal plant material has under gone. The American Society for Testing and
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2008-1-2 Coal-bed gas content must have reached near-saturation either by biogenic or thermogenic gas-generation processes to be economically viable. Cleats must be present to allow for connectivity between sorption sites. If the coal-bed horizons are buried
More2020-1-24 Coal dust explosion is easy to happen in the process of coal pulverization. In order to reduce the risk of coal dust explosion and promote the safety of coal chemical industry, surface modification of the ammonium dihydrogen phosphate (ADP) explosion suppressant was performed with methyl hydrogen-containing silicone oil to obtain modified ammonium dihydrogen phosphate (MADP) powder.
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2006-10-9 Surface Areas and Pore Volumes of Coal Macerals, Fuel Vol 47 331-332. Surface Areas of Coals, Fuel Vol 47 322-324. Thermoelectric Power and Internal Friction of Some Graphitic Carbons, Tanso No 54 99-101 . 1969 The Effect of Oxygen
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