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oxidation of pyrite in coal to magnetite

oxidation of pyrite in coal to magnetite

Oxidation of pyrite in coal to magnetite - ScienceDirect

1984-05-01  To obtain a suitable build-up of Fe304 from pyrite in coal, therefore, the coal should be Oxidation of pyrite in coal to magnetite: A. N. Thorpe et al. heated to a relatively low temperature (390-408) at a low partial pressure of air (1.6-2.4 kPa). At high oxygen concentrations or at slightly higher temperatures, the magnetite formation and its subsequent conversion to a- Fe203 is so rapid ...

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Oxidation of pyrite in coal to magnetite - USGS

When bituminous coal is heated in an inert atmosphere (He) containing small amounts of oxygen at 393-455 ??C, pyrite (FeS2) in coal is partially converted to magnetite (Fe304). The maximum amount of Fe304 formed during the time of heating corresponds to 5-20% of the total pyrite present, depending on the coal sample.

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Oxidation of pyrite in coal to magnetite - ScienceDirect

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 as an outer crust on the pyrite grains.

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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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oxidation of pyrite in coal to magnetite

Method for oxidation of pyrite in coal to magnetite and low ... A method for increasing the magnetization of pyrite-containing pulverized coal comprises heating the coal in an atmosphere of inert gas, desirably nitrogen, containing 3 to 60 torr, preferably 12 to 16 torr, partial pressure of air to a temperature in the range 390° to 455° C., desirably 400° to 410° C., for a time sufficient ...

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Method for oxidation of pyrite in coal to magnetite and ...

Method for oxidation of pyrite in coal to magnetite and low field magnetic separation thereof . United States Patent 4661118 . Abstract: A method for increasing the magnetization of pyrite-containing pulverized coal comprises heating the coal in an atmosphere of inert gas, desirably nitrogen, containing 3 to 60 torr, preferably 12 to 16 torr, partial pressure of air to a temperature in the ...

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Magnetic Separation of Pyrite - 911metallurgist

2021-02-08  Mixing magnetite with pyrite or with coal resulted in a reverse selectivity, that is, the nonmagnetic fraction of the coal had more sulfur. Steam-air treatment of the mixtures showed no promise at all. The next series of experiments involved the investigation of the effect of heat treatment, atmosphere, temperature, and residence time on the magnetic separation of a minus 48-mesh coal ...

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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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US4661118A - Method for oxidation of pyrite in coal to ...

The sulfur content of coal treated in accordance with this method can be reduced by subjecting the treated coal to a low-strength magnetic field for moving at least 50% by weight of the pyrite from the coal although a smaller fraction, about 5 to 25%, of the pyrite is actually converted to magnetite.

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Mechanisms of Pyrite Oxidation to Non-Slagging Species ...

2002-09-01  A project was undertaken to characterize the oxidation of iron pyrite to the non-slagging species magnetite during pulverized coal combustion. The work was aimed at defining the pyrite transformations responsible for the higher slagging propensity of staged, low-NO{sub x} pulverized coal combustor burners. With such burners, coal is injected into a reducing environment.

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Oxidation of pyrite in coal to magnetite Semantic Scholar

Abstract When bituminous coal is heated in an inert atmosphere (He) containing small amounts of oxygen at 393–455 °C, pyrite (FeS2) in coal is partially converted to magnetite (Fe304). The maximum amount of Fe304 formed during the time of heating corresponds to 5–20% of the total pyrite present, depending on the coal sample. The magnetite forms as an outer crust on the pyrite grains.

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Pyrite Oxidation Kinetics - How Fast does Pyrite Oxidize

2018-02-19  For instance, pyrite oxidation occurs through formation of several intermediate ions like ferrous, ferric, thiosulfate, sulfite, dithionate and dithionite; and solid products like elemental sulfur, ferrous and ferric hydroxides, geothite, lepidocrocite, magnetite and maghemite. In addition, the nature of oxidation process depends upon other factors such as particle size, degree of stress or ...

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oxidation of pyrite in coal to magnetite

Oxidation of pyrite in coal to magnetite ScienceDirect. To obtain a suitable build-up of Fe304 from pyrite in coal, therefore, the coal should be Oxidation of pyrite in coal to magnetite: A. N. Thorpe et al. heated to a relatively low temperature (390-408) at a low partial pressure of air (1.6-2.4 kPa). More

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oxidation of pyrite in coal to magnetite

2020-06-26  Oxidation of pyrite in coal to magnetite, "There have been many studies that suggest that the magnetic susceptibility of pyrite in coal can be significantly Investigating the Pyrite oxidation and mineralogical,, were applied to investigate the pyrite oxidation in a coal washing waste, pyrite oxidation is very high because of, and/or . Get Price. pyrite magnetic process practice ...

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Why is pyrite dangerous? - AnswerThirst

2021-08-30  Oxidation of pyrite releases toxic metals and metalloids such as Arsenic (As), which is poisonous for humans. Does pyrite stick to a magnet? Pyrite has a cubic structure; gold does not. Take a magnet with you. Iron pyrite will stick to the magnet because of its high iron content; gold will not. Nitric acid will turn iron pyrite black, but ...

Get Price

oxidation of pyrite in coal to magnetite

2020-06-26  Oxidation of pyrite in coal to magnetite, "There have been many studies that suggest that the magnetic susceptibility of pyrite in coal can be significantly Investigating the Pyrite oxidation and mineralogical,, were applied to investigate the pyrite oxidation in a coal washing waste, pyrite oxidation is very high because of, and/or . Get Price. pyrite magnetic process practice ...

Get Price

Mechanisms of Pyrite Oxidation to Non-Slagging Species ...

2002-09-01  A project was undertaken to characterize the oxidation of iron pyrite to the non-slagging species magnetite during pulverized coal combustion. The work was aimed at defining the pyrite transformations responsible for the higher slagging propensity of staged, low-NO{sub x} pulverized coal combustor burners. With such burners, coal is injected into a reducing environment.

Get Price

micromill steel oxidation of pyrite in coal to magnetite

Oxidation of pyrite in coal to magnetite ScienceDirect. May 01, 1984 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.

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Oxidation Of Pyrite In Coal To Magnetite

Oxidation of pyrite in coal to magnetite - ScienceDirect. Oxidation of pyrite in coal to magnetite Arthur IM. Thorpe, Frank E. Senftle, Corrine C. Alexander and Frank T. Dulong US Geological Survey. Oxidation of pyrite in coal to magnetite Request PDF. There have been many studies that suggest that the magnetic susceptibility of pyrite in coal can be significantly improved by heating it to ...

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micromill steel oxidation of pyrite in coal to magnetite

micromill steel oxidation of pyrite in coal to magnetite. From pyrite heating in n , whereas the residue when heated in co denotes the presence of magnetite it was proposed that co dissociates in co and o after heating to c, so transformation in co involved partial oxidation to magnetite, in accordance with equation fes co g fe o fe o cos g so g

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O Idation Of Pyrite In Coal To Magnetite

Oxidation Of Pyrite In Coal To Magnetite Usgs. The magnetite forms as an outer crust on the pyrite grains the fact that the magnetic properties of the pyrite grains are substantially increased by the magnetite crust suggests that pyrite can be separated from coal by use of a low magnetic field. Method For Oxidation Of Pyrite In Coal To Magnetite And . Apr 28 1987 in yet another aspect of the ...

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Magnetic Separation of Pyrite - 911metallurgist

2021-02-08  Mixing magnetite with pyrite or with coal resulted in a reverse selectivity, that is, the nonmagnetic fraction of the coal had more sulfur. Steam-air treatment of the mixtures showed no promise at all. The next series of experiments involved the investigation of the effect of heat treatment, atmosphere, temperature, and residence time on the magnetic separation of a minus 48-mesh coal ...

Get Price

micromill steel oxidation of pyrite in coal to magnetite ...

oxidation of pyrite in coal to magnetite. oxidation of pyrite in coal to magnetite . thermomagnetic studies of conversion of pyrite and. the results of a study of the conversion of pyrite obtained from coal . Get Price; minerals separating machines for copper ores. Apr 28, 1987 In yet another aspect of the present invention, the pyrite is converted to magnetite by heating pyrite-containing ...

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Pyrite Oxidation Kinetics - How Fast does Pyrite Oxidize

2018-02-19  For instance, pyrite oxidation occurs through formation of several intermediate ions like ferrous, ferric, thiosulfate, sulfite, dithionate and dithionite; and solid products like elemental sulfur, ferrous and ferric hydroxides, geothite, lepidocrocite, magnetite and maghemite. In addition, the nature of oxidation process depends upon other factors such as particle size, degree of stress or ...

Get Price

Why is pyrite dangerous? - AnswerThirst

2021-08-30  Oxidation of pyrite releases toxic metals and metalloids such as Arsenic (As), which is poisonous for humans. Does pyrite stick to a magnet? Pyrite has a cubic structure; gold does not. Take a magnet with you. Iron pyrite will stick to the magnet because of its high iron content; gold will not. Nitric acid will turn iron pyrite black, but ...

Get Price