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While pyrite is a weakly paramagnetic mineral, ferrimagnetic greigite has the capability of carrying a stable remanent magnetization. Its magnetic lattice is similar to that of magnetite, but coercivity is higher and susceptibility and saturation magnetization are lower (Hoffmann, 1992, Roberts, 1995).
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Semantic Scholar extracted view of "Oxidation of pyrite in coal to magnetite" by A. Thorpe et al.
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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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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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Oxidation of pyrite in coal to magnetite. When bituminous coal is heated in an inert atmosphere (He) containing small amounts of oxygen at 393–455 °C, pyrite (FeS 2) in …
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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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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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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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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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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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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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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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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 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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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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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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Magnetite heavy media processes are accurate, efficient and easy to control separators, capable of producing high quality clean coal. Magnetite recovery circuit operation and magnetite consumption are the main reasons for high capital and operating costs. Over the last two decades, several countries have been actively involved in …
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Made available by U.S. Department of Energy Office of Scientific and Technical Information ...
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"If a plant is losing magnetite, even if the losses are within the industry standards, the mining company still has to replenish that magnetite supply," Marin said. "The typical recovery of magnetite in a heavy media plant using traditional technology can be as high as 99%, while the anticipated recovery using a Hybrid Wet Drum Separator ...
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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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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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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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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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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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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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We present the results of an experimental study into the sulfidation of magnetite to form pyrite/marcasite under hydrothermal conditions (90–300 °C, vapor saturated pressures), a process associated with gold deposition in a number of ore deposits.The formation of pyrite/marcasite was studied as a function of reaction time, …
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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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Made available by U.S. Department of Energy Office of Scientific and Technical Information ...
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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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The results show that pyrite in coal gangue can be decomposed into pyrrhotite when heated in an inert atmosphere. Pyrites with different morphologies and structures exhibit distinct thermal behavior. ... magnetite rapidly converted to hematite. Magnetite (Fe 3 O 4) was oxidized to hematite (Fe 2 O 3); however, it retained the …
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