pyrite coal

Pyrite (FeS 2) is a mineral of particular importance in several coal markets. Sulfur from pyrite can have a detrimental influence on many chemical processes …

Pyrite transformation in two coals heated in CO 2 was investigated. It was found that the pyrite experienced two visibility DTG peaks at temperature above 840 °C …

1. Color: Pyrite typically has a brassy-yellow to pale-gold color, although it can also appear silver, bronze, or even black in some cases, depending on impurities and weathering. Its color is often o...
2. Luster: Pyrite has a metallic luster, meaning it reflects light in a manner similar to a metal, giving it a shiny appearance.

1. Color: Pyrite typically has a brassy-yellow to pale-gold color, although it can also appear silver, bronze, or even black in some cases, depending on impurities and weathering. Its color is often o...
2. Luster: Pyrite has a metallic luster, meaning it reflects light in a manner similar to a metal, giving it a shiny appearance.
3. Transparency: Pyrite is generally opaque, meaning it does not transmit light and is not transparent.
4. Diaphaneity: Pyrite is typically diaphanous, which means it does not allow light to pass through it.

The main forms of pyrite in coal are finely dispersed pyrite, large blocks of pyrite, invaded pyrite, and stuffed pyrite (Yu 2013). In China, about 80% of coal is used as fuel (Tao et …

The coal gangue samples containing pyrite used in the present investigation were extracted from the Pingshuo open-pit mine north of Ningwu coalfield, Shanxi Province, China. The main mineable coal seams in the study area were coal Nos. 4 and 9. Coal gangue from coal No. 4 is coal-measure kaolinite with high purity.

The thermal phase transition of pyrite from coal was studied using thermogravimetry and derivative thermogravimetric, infrared spectroscopy and X-ray diffraction (XRD). According to the XRD results, the phase transition of the pyrite starts at 350 °C, pyrrhotite and magnetite are intermediate products of the oxidation from pyrite …

Arsenic in bituminous coal occurs primarily in pyrite and, to a lesser extent, in organic portions of the coal. A small fraction of this arsenic is emitted during coal combustion. This Fact Sheet pro-vides information on the arsenic content of U.S. coals, how arsenic occurs, and its behavior during mining, coal preparation, and coal combustion ...

@article{osti_4341578, title = {Removal of pyrite from coal by dry separation methods. Report of investigations}, author = {Abel, W T and Zulkoski, M and Brady, G A and Eckerd, J W}, abstractNote = {Sulfur dioxide emissions from coal-burning power plants can be significantly lowered by removing pyrite from the coal prior to buming. . Conventional …

An abundant mineral in nature and despite its potential as raw material for different segments of industry, when it comes from coal mining, pyrite (FeS 2) is treated …

Most of the mineral matter was extracted from Illinois No. 6 coal, a representative bituminous coal, by first leaching it with a hot alkaline solution and then with a dilute mineral acid. The alkalis employed, in decreasing effectiveness, were: (1) NaOH, (2) Na 2 CO 3, (3) NaHCO 3 . The results generally agreed with those obtained in leaching quartz, kaolinite, …

A microprobe analysis of the synthetic pyrite showed the sample to be one phase and to have excellent uniformity. The calculated formula based on sulphur was found to be Feo.979S2.ooo- The two pyrite- containing coal samples were studied to see if coal rank influences the pyrite oxidations. The coal proximate and sulphur analyses appear …

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 ...

When bituminous coal is heated in an inert atmosphere (He) containing small amounts of oxygen at 393–455 °C, pyrite (FeS 2) in coal is partially converted to magnetite (Fe 3 0 4).The maximum amount of Fe 3 0 4 formed during the time of heating corresponds to 5–20% of the total pyrite present, depending on the coal sample. The magnetite forms …

The coal metamorphism in Central Hunan provides valuable information about hydrothermal activity and water/rock reactions. Learning how to collect age data on hydrothermal fluid systems is necessary for understanding the history and genetic mechanisms of large-scale coal-generated graphite deposits. The Shihangli graphite …

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 …

In most operating coal-cleaning plants, a significant amount of pyrite is recovered in the froth during flotation of high-sulfur coal. This pyrite recovery is commonly believed to be a result of pyrite particles floating due to hydrophobicity. However, even though a wide range of pyrite depressants have been reported over the years, there is …

The pyrolysis behaviors of coal-related model compounds (bibenzyl and benzyloxybenzene) were investigated on a fixed-bed reactor catalyzed by pyrite (main component is FeS 2).The pyrolysis products were analyzed by gas chromatography (GC). The results indicated pyrite could increase the conversion of the model compounds and …

Pyrite contents of 5 %–7 % in coal has the most significant effects on spontaneous combustion within the range of this study. The conclusions are conducive …

Coal mining has declined sharply as power plants moved away from coal, especially the Illinois Coal Basin's high-sulfur coal. Today, only 2,700 Illinois miners work in 17 coal mines. Sparta's Randolph County, where most pyrite suns are found, has only one underground and two surface mines. Because these mines are now highly mechanized ...

The pyrite coal-balls found in No.9 coal of Taiyuan Formation in Dongzhouyao Mine of Datong Coalfield were selected to investigate its mineralogy and elemental geochemistry using optical microscope observation, scanning electron microscopy combined with an energy-dispersive X-ray spectrometer (SEM-EDX), …

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 …

pyrite crystals occur in coal. Figure 1 provides details of cellular compression. The coal specimen from the Lovilia (shaft) mine is examined in two orientations: the top of a fresh fracture surface corresponding to various magnification views of the top of the coal seam (Figures la-c); and the side, end-on view of the

Many coal deposits contain disseminated pyrite and as the coal is burned the pyrite's sulfur component oxides to form sulfur dioxide. In the atmosphere, sulfur dioxide combines with moisture to produce sulfuric …

Scanning electron microscopy and electron microprobe analysis were used to identify a rare type of As-bearing pyrite in selected specific gravity separates from the Pennsylvanian age Upper Freeport coal bed, west-central Pennsylvania. Arsenic was detected mainly in cell-wall replacement pyrite where concentrations ranged from …

The pyrite in coal mostly coexists with the coal matrix, called coal-pyrite in this study, and some monomer pyrite. Among them, framboïdal pyrite, smaller euhedral …

Sulfur dioxide emissions from coal-burning power plants can be significantly lowered by removing pyrite from the coal prior to buming. Conventional wet washing methods remove-pyrite down to fine size; however, because of difficulties associated with wet processing of fine-size coal, dry removal methods offer an attractive alternate.

Naturally occurring pyrite commonly contains minor substituted metals and metalloids (As, Se, Hg, Cu, Ni, etc.) that can be released to the environment as a result of its weathering. Arsenic, often the most abundant minor constituent in pyrite, is a sensitive monitor of progressive pyrite oxidation in coal. To test the effect of pyrite composition …

The thermal behaviors of pure pyrite are studied under nitrogen and hydrogen atmospheres in a pressurized thermal balance. The transfer of pyrite in coal during pyrolysis and hydropyrolysis is investigated in a fixed-bed reactor. The results suggest that the indigenous hydrocarbon with hydrogen donor ability in coal can promote the …

Pyrite cubic crystals on marlstone, from Navajún, Rioja, Spain. Size: 95 mm x 78 mm. Main crystal: 31 mm on edge. ... and Brazil, primarily used to refer to pyrite found in coal. Pyrite is the most common of the sulfide minerals. The name pyrite is derived from the Greek πυρίτης (pyritēs), "of fire" or "in fire", in turn from ...