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analysis of surface modification on coal pyrite

Analysis of surface modification on coal pyrite

Such surface modification of coal and pyrite particle to ward opposite directions leads to a good result of flotation separation. Modification mechanisms of coal and pyrite surface were analyzed.

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Analysis of surface modification on coal pyrite

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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Sabinet Analysis of surface modification on coal pyrite

The oxidized products on the pyrite surface were reduced by an electrochemical method, returning the surfaces to a hydrophilic state and thus increasing the separating efficiency of coal from pyrite by flotation. Key words: surface oxidation, pyrite, SEM, XRD pattern, electrochemical modification.

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Journal Papers Analysis of surface modification on coal pyrite

Analysis of surface modification on coal pyrite. AUTHOR H Zhu, HL Li, Z Sh Ou, DZ Wang. file v102n05p315.pdf description Journal Paper Vol 102 No 05 Pg 315. page 315. Add comment. Name (required) E-mail (required, but will not display) Notify me of follow-up comments. Send. JComments.

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Coal surface control for advanced fine coal flotation

Concomitantly, the ash content of these coals is to be reduced to 6% or less. Investigation of mechanisms for the control of coal and pyrite surfaces prior to fine coal flotation is an important aspect of the project objectives. Large quantities of coal samples have been procured from six major seams.

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CHARACTERIZATION OF MINERAL AND COAL PYRITE

Jan 01, 1991· In a few samples described in the chapter, the surfaces of the mineral pyrite tended to be smoother and the edges sharper than those for coal pyrite. At 20,000X, the coal pyrite surface began to appear smooth, although submicron particles were still observed attached to the surfaces. No porosity was observed at this level of analysis.

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OXIDATION OF COAL AND COAL PYRITE MECHANISMS AND

Oxidation of Coal and Coal Pyrite: F.M. Doyle, Univ. CalZomia at Berkeley 5/31/95 1 E-4 h en u a 1E-6 1E-8 I I I 1 calculated Experimental 1E-5 1E-4 1 E-3 1 E-2 1E- 1 Aqueous Cd Concentration (mol/l) Fieure 5: Fitted Langmuir isotherm (calculated) and experimental data for cadmium uptake by thermally oxidized coal. CdSO4 solutions initially contained 6109,625,64 and 6 ppm

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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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Journal Papers Analysis of surface modification on coal pyrite

Analysis of surface modification on coal pyrite. AUTHOR H Zhu, HL Li, Z Sh Ou, DZ Wang. file v102n05p315.pdf description Journal Paper Vol 102 No 05 Pg 315. page 315. Add comment. Name (required) E-mail (required, but will not display) Notify me of follow-up comments. Send. JComments.

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(PDF) Comparative study of the surface properties and the

Image analysis characterization of pyrite in fine coal flotation. Article. Aug 1993; Surface modification for low-rank coal with poor hydrophobicity is critical to its efficient flotation. In

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Article The Effect of Carbon Defects in the Coal–Pyrite

in coal flotation. Xi et al. [16,17] studied the effect of carbon defects and surface carbon atom adsorption on the hydrophilicity of the whole surface of the coal–pyrite using DFT calculations. They found that the carbon defects reduced the hydrophilicity of the pyrite surface (the closer to the carbon defect center, the weaker the

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Surface Oxidation of Pyrite as a Function of pH

Pyrite, the most abundant metal sulfide at the surface of Earth, plays a key role in many processes such as acid mine drainage, redox cycling of metals at oxic-anoxic boundaries of lake bottom, and degradation of pollutants. The oxidation of pyrite was studied in batch experiments over a large range of pH (2.5−12), with trace oxygen. Surface analysis of the samples was performed using X-ray

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Role of pyrite in formation of hydroxyl radicals in coal

Dec 19, 2006· 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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Diagnosis of the Surface Chemistry Effects on Fine Coal

Jul 09, 2013· 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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Arsenic in Coal USGS

Figure 2. Elemental maps and microprobe analysis points showing distribution of arsenic (As) in pyrite in two Alabama coal samples. Maps are false-color images using a “thermal” intensity scale. A, Pyrite from a bituminous coal sampled in Cullman County, Alabama. Arsenic concentration at the

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USGS Bulletin 1823 Sampling of Coal Beds for Analysis

In a surface mine, a fresh face can be sampled following the loading stage of mining. Select a face having a plane that is normal to bedding. Coal may be cut back with a hand pick at the top and bottom to produce a proper surface. Spread a 3- ´ 4-m nylon-reinforced vinyl tarpaulin on the floor.

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Float-Sink (Washability) Test, Coal Analysis, Kentucky

Jul 27, 2020· Coal has relatively low density or specific gravity (1.2 to 1.5) compared to other rocks such as shale (2.4 to 2.8) or minerals such as pyrite (4.9 to 5.2). Hence, float-sink analyses are usually run in liquids with densities between 1.3 and 2.0.

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Coal Structure and properties of coal Britannica

Coal is slightly denser than water (1.0 megagram per cubic metre) and significantly less dense than most rock and mineral matter (e.g., shale has a density of about 2.7 megagrams per cubic metre and pyrite of 5.0 megagrams per cubic metre). Density differences make it possible to improve the quality of a coal by removing most of the rock matter

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Redox performance of pyrite cinder in methane chemical

Sep 01, 2020· Pyrite cinder is a solid by-product in the sulfuric acid production (), which contains Al 2 O 3, SiO 2, CaSO 4 and Fe 2 O 3, .The Fe 2 O 3 and CaSO 4 in pyrite cinder can be used as active metal oxides to provide lattice oxygen. The source of pyrite cinder is sufficient, and the annual yield of pyrite cinder is about 10 million tons in China .The utilization of pyrite cinder as a kind of

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Coal surface control for advanced physical fine coal

The overall objective of the project is to develop techniques for coal surface control prior to the advanced physical fine coal cleaning process of selective agglomeration in order to achieve 85% pyrite sulfur rejection at an energy recovery greater than 85% based on run-of-mine coal. The surface control is meant to encompass surface

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Transformation of minerals at the boundary of magma-coal

Oct 22, 2020· In addition to the increase amounts of ankerite and pyrite, chlorite, serpentine, and muscovite, and other secondary minerals, are generated following igneous intrusion. ③ Raman analysis suggests that thermally-altered coal possesses the characteristics of both pyrite and coke. Coke from the magma-coal boundary zone possesses the typical

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Pyrite formation from FeS and H2S is mediated through

Apr 02, 2019· Pyrite is the most abundant iron−sulfur mineral in sediments. Over geological times, its burial controlled oxygen levels in the atmosphere and sulfate concentrations in seawater. However, the mechanism of pyrite formation in sediments is still being debated. We show that lithotrophic microorganisms can mediate the transformation of FeS and H2S to FeS2 at ambient temperature if

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