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o idation of pyrite in coal to magnetite in Mexico
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Oxidation of pyrite in coal to magnetite (Journal Article)
Made available by U.S. Department of Energy Office of Scientific and Technical Information ...
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Investigation on the transformation behaviours of Fe …
1. Introduction Iron-containing minerals are considered one of the major contributors of deposition, slagging and fouling problems in the pulverized coal combustion process. 1,2 Pyrite, siderite, ankerite and iron-bearing clay minerals, such as Fe 2+-illite, are the most common iron-bearing minerals in coal. 3,4 Generally, the ash produced from coal …
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Formation of massive iron deposits linked to explosive volcanic
Investigation of surface and drill core samples revealed a complex lithological, textural and geochemical zoning for magnetite from the Laco Norte, Laco Sur, and Extensión Laco Sur ore bodies ...
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Magnetite | NOVA Mineralogy
Physical Properties: Chemical formula: Fe 3 O 4: Class: Oxide: Crystal system: Cubic: Habit: Typically octahedral May display contact or lamellar twins Massive or granular aggregates
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Magnetite : Properties, Occurrence, Formation, Deposits
Magnetite is a naturally occurring mineral that is one of the most common iron ores and is widely distributed throughout the world. It is a black, metallic-looking mineral with a distinctive magnetic property, hence its name. Magnetite has the chemical formula Fe3O4, which means it is composed of two iron (Fe) ions combined with three oxygen (O ...
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Modelling and numerical simulation of isothermal oxidation …
A mathematical model based on the computational fluid dynamics method, heat and mass transfer in porous media and the unreacted shrinking core model for the oxidation reaction of an individual magnetite pellet during preheating was established. The commercial software COMSOL Multiphysics was used to simulate the change in the …
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Thermal phase transition of pyrite from coal | Journal of …
The thermal behavior of pyrite from coal was studied by using TG–DTG and IR techniques. The pyrite is initially oxidized to form pyrrhotite and then successively …
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Ore-forming processes in the Khetri Copper Belt, western …
The Khetri Copper Belt of the Aravalli-Delhi Fold Belt in western India hosts Cu (± Au ± Ag ± Co ± Fe ± REE ± U) mineralization that is likely of iron oxide-copper-gold (IOCG) type. The study on the Madan-Kudan deposit in this belt documents four vein types: Type-1 (pyrite ± chalcopyrite ± magnetite ± biotite ± scapolite ± amphibole ± chlorite), …
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The thermal transformation behavior and products of pyrite during coal
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.
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The flotation behavior of coal-pyrite in high-sulfur coal
The floatability of coal-pyrite is poor with dodecane as the collector. A part of fine liberated pyrite mixed with the clean coal in flotation. The linear relationship between the ash and liberated pyritic sulfur recoveries implies the same recovery mechanism, that is, mechanical entrainment. Molecular dynamics simulation also demonstrates that ...
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Mineralogy and elemental geochemistry of pyrite coal-balls, …
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), …
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An experimental study of the mechanism of the replacement of magnetite
DOI: 10.1016/J.GCA.2010.06.035 Corpus ID: 129327515; An experimental study of the mechanism of the replacement of magnetite by pyrite up to 300 °C @article{Qian2010AnES, title={An experimental study of the mechanism of the replacement of magnetite by pyrite up to 300 °C}, author={Gujie Qian and Jo{"e}l Brugger and …
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Mechanism of interaction of pyrite with hematite as simulation …
3.2.. Pyrite onto hematite discsThe external surface of water wall tubes is considered to be an oxide scale of Fe 2 O 3 (hematite). To test the chemical interaction of pyrite with the hematite, DSC experiments were run for pyrite deposited onto hematite discs, the mass loss, DTGA curve and heat flow profiles of pyrite decomposition are …
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Mineralogy and elemental geochemistry of pyrite coal-balls, …
DOI: 10.1016/j.oregeorev.2023.105538 Corpus ID: 259394338; Mineralogy and elemental geochemistry of pyrite coal-balls, Datong Coalfield, Shanxi Province, China: Implications for differentiation mechanism
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Oxidation of pyrite in coal to magnetite
The concept of converting pyrite in coal to a ferri- or antiferromagnetic compound has been suggested by Marusak et al.11, who studied the magnetokinetics of the oxidation of pyrite in dry air temperatures as high as 600.
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Solubility of the assemblage pyrite-pyrrhotite-magnetite …
The simultaneous solubilities of the minerals pyrite, pyrrhotite, magnetite, sphalerite, galena, gold, stibnite, bismuthinite, argentite, and molybdenite have been measured in 0 to 5 m NaCl solutions from 200 degrees to 350 degrees C at CO 2 partial pressures from 0.69 to 172 bars with oxygen and sulfur fugacities controlled by the pyrite-pyrrhotite …
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The late diagenetic conversion of pyrite to magnetite by …
DOI: 10.1016/0009-2541(96)00007-1 Corpus ID: 98311910; The late diagenetic conversion of pyrite to magnetite by organically complexed ferric iron @article{Engel1996TheLD, title={The late diagenetic conversion of pyrite to magnetite by organically complexed ferric iron}, author={Michael H. Engel and R. Douglas Elmore}, …
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Oxidation of pyrite in coal to magnetite | Semantic Scholar
Semantic Scholar extracted view of "Oxidation of pyrite in coal to magnetite" by A. Thorpe et al.
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Microwave heating of coal for enhanced magnetic removal of pyrite
The separation of fine pyrite from coal is difficult by conventional magnetic separation methods. The performance of magnetic separation in removing mineral pyrite from coal can be improved by increasing the pyrite's magnetic susceptibility. ... Magnetite, Fe 3 O 4: 101: Gamma-hematite, γ-Fe 2 O 3: 104: Monoclinic pyrrhotite, FeS 1.14 (Fe 7 …
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In situ high-temperature phase transformation studies on pyrite
Compared to feed coal, minerals like hematite, hercynite, magnetite, and mullite are newly formed in combustion products. The formation of hematite and magnetite were mainly from the decomposition ...
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Gas generation and its isotope composition during coal …
Pyrolysis experiments were conducted at 370–550 °C for 72 h in closed gold capsules to investigate the effect of nickel and magnetite on gas generation from coal in the absence and presence of water.. Nickel had a great catalytic effect on the yield, molecular and carbon and hydrogen isotope composition of generated gases. The …
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Gamma Irradiation of Pyrite in Egyptian Coal as Studied by …
A well characterized coal sample from Egypt was irradiated using Co source for different dwell times starting from 10 to 100 h in the first experiment and from 7 to 28 days for the second one.
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Hydrothermal sulfidation of biogenic magnetite …
magnetite produces framboid-like pyrite Check for updates Eric Runge 1,2, Muammar Mansor 3, ... Nano-magnetite [Fe 3O 4] is an essential piece in this puzzle due to its
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south-africa magnetite Suppliers & Manufacturers
Product/Service:magnetite ore, vanadium pellets, coal,,magnetite ore, vanadium pellets, coal, Felix Moratonas CommBroking is a progressively growing International Commodity Broking and Procurement Agency.
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Magnetite | Common Minerals
Magnetite is a black, opaque, magnetic mineral that leaves a black streak when rubbed across a hard rough surface. It is one of the most abundant metal oxides, and its crystal structure contains both the ferrous (Fe+2) …
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The thermal transformation behavior and products of pyrite …
The transformation proceeds in the sequence of pyrite (0 ∼ 400 °C) – nano-microspheric magnetite and jarosite (400 ∼ 500 °C) – nano-microspheric hematite (500 …
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Decomposition of pyrite during pulverized coal combustion
Pyrite was found to lose sulphur from 300 °C upwards, to form pyrrhotite and haematite. In both 2% O 2 and N 2, magnetite forms above 800 °C in preference to haematite. In 2% O 2, an atmosphere which closely resembles boiler conditions, the maximum amount of haematite was found in the range 800–900 °C. Drop-tube …
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Oxidation of synthesized sub-micron pyrite (FeS 2 ) in …
Semantic Scholar extracted view of "Oxidation of synthesized sub-micron pyrite (FeS 2 ) in seawater" by A. Gartman et al. Skip to search form Skip to main content Skip to account ... the sulfide counterpart of the spinel-structured oxide material magnetite (Fe3O4), is a mineral widely identified in anoxic aquatic environments and certain soils ...
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Study of pyrite transformation during coal samples heated …
To eliminate the influence of some minerals, for example, sulfate, in coal on the thermal characteristic of pyrite in CO 2 atmosphere, coal samples were demineralized by washing the section sample with hydrochloric acid (HCl, A.R.). In the acid-washing process, about 100 g of the dry raw coal was dispersing in 500 mL 2.5 M HCl, then …
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Thermal transformation of coal pyrite with different …
Thermal transformation of coal pyrite with different structural types during heat treatment in air at 573–1473 K. Author links open overlay panel Xiaoshuai Wang a b, Tengda Ma a, Yuegang Tang a, ... Hematite and magnetite are the products of diagenetic and epigenetic pyrite samples. Slagging occurs or not depends on the kinds of minerals …
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Oxidation states of the metal in the minerals haematite and magnetite …
Hint: Iron is the metal that is present in both the minerals haematite and magnetite. In both the minerals, there are two elements present: iron and oxygen. The magnetite mineral has two oxidation states. Complete step by step solution:
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Idwala Magnetite
Magnetite is supplied to the coal industry as a heavy separation medium (for coal washing). Idwala Magnetite: Phalaborwa. c/o Foskor Mine Phalaborwa. Plant History. 1979-1986. Mill 1 and 2 commissioned. 1983. Transvaal Magnetite took over the operation of the plant from Foskor. 1987.
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Pyrite | Common Minerals
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 acid. This is an important source of 'acid rain', which can damage building stones and monuments, cause a decline in natural lake ...
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The Thermal Transformation Behavior and Products of Pyrite During Coal
Two samples of coal gangue containing high content of pyrite were studied by XRD, TG-MS, SEM-EDS, and TEM in order to reveal the thermal transformation behavior and products of pyrite during coal gangue combustion. The results showed that the pyrite will transform into nanosphere of hematite during coal gangue combustion in …
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Geochemical discrimination of pyrite in diverse ore deposit …
A discriminant analysis (DA), based on multi-element compositions of pyrite, distinguishes iron oxide-apatite (IOA), iron oxide copper-gold (IOCG), skarn Cu-(Fe), …
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(a, b) Disseminated pyrite and magnetite grains distributed …
(e) Pyrite grains rimmed by magnetite, with residual pyrite preserved in the cores of the grains. (f) energy‐dispersive spectroscopy map of the same area presented in Figure 4e illustrating the ...
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