pyrite removal from coal
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pyrite removal from coal

Removal of Pyrite in Coal Flotation: Mineral Processing ...

Apr 25, 2007  In most operating coal-cleaning plants, a significant amount of pyrite is recovered in the froth during flotation of high-sulfur coal. Reducing the pyrite recovery first requires that the primary recovery mechanism should be identified, as different measures are required for reducing entrainment, locked-particle flotation, or true hydrophobic flotation.

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US3917465A - Removal of pyritic sulfur from coal using ...

Finely divided coal or solid coal derivatives containing pyrite are reacted with a ferric ion solution; FeCl3 is particularly suitable. The ferric ion is reduced to ferrous ion and free sulfur is formed. The solution is then filtered from the coal which is then washed and heat dried under low pressure. Most of the free sulfur is volatized from the coal due to the heat drying; additional free ...

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NIOSHTIC-2 Publications Search - 10008981 - Removal of ...

The difficulties associated with wet-processing fine size coal led the Bureau of Mines to investigate a dry process for removing pyrite from coal pulverized to powerplant fineness. The dry process that was investigated consists of two cleaning steps: first, centrifugal separation is used to remove a fine, pyrite-depleted portion as a product; second, the remaining coarser, pyrite-enriched portio

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(PDF) Electrostatic Separation of Pyrite From Coal

This paper reviews the various forms of electrostatic separation available to remove sulphur, in the form of pyrite (FeS2) from coal. Research has been carried out to desulphurise coal using an ...

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Aluminum-Enhanced Coal Pyrite Leaching during SO2 Removal ...

Jun 06, 2016  During SO 2 removal from flue gas by coal slurry scrubbing, coal pyrite sulfur can be simultaneously reduced. But satisfactory coal pyrite conversion cannot be achieved under normal scrubbing conditions. In the present work, aluminum oxide and aluminum sulfate were tested as additives to enhance the leaching of coal pyrite during SO 2 removal in a bubbling reactor.

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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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The microbial desulfurization of coal

The results of the 1-year operation of this plant are reported here, the most significant being the 90 % pyrite removal achieved in five stirred tank bioreactors operating with a 40 % solids suspension and the pyritic iron solubilization rate of 36 mg dm(-3) h(-1).

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Occurrence and morphology of pyrite in Bulgarian coals ...

Mar 01, 1996  International Journal of ELSEVIER International Journal of Coal Geology 29 (1996) 273-290 Occurrence and morphology of pyrite in Bulgarian coals Jordan Kortenski a,*, Irena Kostova b ' University of Mining and Geology, Softy 1156, Bulgaria " Institute q/ Applied Mineralogy, Bulgarian Academy of Science, Sofia 1000, Bulgaria Received 2 November 1994; accepted 30 August 1995

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$26 million project to remove acid mine drainage from Belt ...

Oct 20, 2021  The problem at abandoned coal mines like those in Belt stems from the presence of naturally occurring pyrite nodules within the exposed coal seam. ... is

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SO2 Removal by Leaching Coal Pyrite Energy Fuels

The samples taken from the reactor were analyzed for iron concentrations, which were then used to calculate fractions of coal pyrite leached.It was found that SO2 removal was highly temperature sensitive, giving 13.1% recovery at 21 °C and 99.2% recovery at 73 °C after 4 h.

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Reactor Test Project for Chemical Removal of Pyritic ...

is the pyrite leaching rate, expressed in weight of pyrite removed per 100 weights of coal per hour (rate of coal pyrite cone, reduction), W is the pyrite concentration in coal at time t in wt. percent, t is the reaction (leaching) time in hours, Y is the ferric ion-to-total iron ratio in the leacher at time t, dimensionless, and K. is the ...

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Removal of pyritic sulfur from coal (Patent) OSTI.GOV

@article{osti_7269974, title = {Removal of pyritic sulfur from coal}, author = {Meyers, R A}, abstractNote = {Finely divided coal or coal derivatives, containing pyrite, are reacted with sulfurous acid (the oxidizing agent); if desired, HCl may also be used to improve the reaction efficiency to remove pyritic sulfur from coal as shown by equations given.

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(PDF) Pyrite removal from Illinois #6 coal by CrCl 2 ...

About 95.9% of the pyrite was removed from CrCl 2 treated Illinois a6 coal, but 65% of the pyrite was still present in the coal after the HFrHCl treatment. Compared to removal from kerogen, pyrite removal from Illinois a6 coal by Fig. 3. TOF-SIMS spectra for the cation part of CrCl 2 treated Illinois a6 coal.

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Microbial removal of pyrite from coal using a percolation ...

To compare the suspension and the percolation process system for the microbial desulphurization of coal the microbial pyrite oxidation in coal during storage in dumps was investigated in laboratory experiments with Thiobacillus ferrooxidans using a percolation bioreactor and resulted in a removal of 75% of pyrite within 70 days. In the initial desulphurization phase 450 mg pyritic-S/kg coal ...

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Controlling pollutants by removing pyrite during the coal ...

Rod Truce of Hansom Environmental Products discusses some of the benefits of removing pyrite and silica from coal during the milling process. Mr. Truce was a...

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(PDF) Electrostatic Separation of Pyrite From Coal

This paper reviews the various forms of electrostatic separation available to remove sulphur, in the form of pyrite (FeS2) from coal. Research has been carried out to desulphurise coal using an ...

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Leaching Pyrite From Coal Waste: Results of Diagnostic Study

removal of pyrite from coal and coal waste (3),4 (3) the recovery of fuels from coal wastes, (4) the evaluation of groundwater contamination from mine wastes (4), and (5) the removal of solutes onto solid substrates (5).5 The leaching process involves a coupling of chemical reactions and transport phenomena in a multicomponent, multi­ ...

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Magnetic Separation of Pyrite

Feb 08, 2021  The process is being reinvestigated to increase the efficiency of pyrite removal. If pyrite is finely distributed in coal, it becomes necessary to crush the coal to liberate the pyrite. Removal of the liberated or partly liberated pyrite by the conventional techniques of wet ore processing has been the subject of many studies.

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Effect of Pretreatment on Pyritic Sulphur Reduction from Coal

The removal of 90% of the pyrite from coal by bacterial conditioning followed by oil agglomeration is attainable in Minto coal only if it is ball milled in the laboratory to an average particle ...

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SO2 Removal by Leaching Coal Pyrite Energy Fuels

The samples taken from the reactor were analyzed for iron concentrations, which were then used to calculate fractions of coal pyrite leached.It was found that SO2 removal was highly temperature sensitive, giving 13.1% recovery at 21 °C and 99.2% recovery at 73 °C after 4 h.

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Occurrence and morphology of pyrite in Bulgarian coals ...

Mar 01, 1996  International Journal of ELSEVIER International Journal of Coal Geology 29 (1996) 273-290 Occurrence and morphology of pyrite in Bulgarian coals Jordan Kortenski a,*, Irena Kostova b ' University of Mining and Geology, Softy 1156, Bulgaria " Institute q/ Applied Mineralogy, Bulgarian Academy of Science, Sofia 1000, Bulgaria Received 2 November 1994; accepted 30 August 1995

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Natural pyrite to enhance simultaneous long-term nitrogen ...

Jan 01, 2019  Therefore COD removal between the PCW and LCW did not show significant difference in the three year's operation. As some unconventional mineral substrates, such as shale, coal slag, zeolite, etc., were used in CWs, the removals of COD and NH 4 +-N varied from 23% to 84%, and from 26% to 100%, respectively (Saeed and Sun, 2012).

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Removal of pyritic sulfur from coal (Patent) OSTI.GOV

@article{osti_7269974, title = {Removal of pyritic sulfur from coal}, author = {Meyers, R A}, abstractNote = {Finely divided coal or coal derivatives, containing pyrite, are reacted with sulfurous acid (the oxidizing agent); if desired, HCl may also be used to improve the reaction efficiency to remove pyritic sulfur from coal as shown by equations given.

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Electrochemical removal of pyrite scale using green ...

Feb 26, 2021  Pyrite is also removed via oxidative dissolution in coal-powered stations to reduce the level of sulfur dioxide emission. ... the cost of the removal of pyrite scale calculated here is based only ...

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(PDF) Pyrite removal from Illinois #6 coal by CrCl 2 ...

About 95.9% of the pyrite was removed from CrCl 2 treated Illinois a6 coal, but 65% of the pyrite was still present in the coal after the HFrHCl treatment. Compared to removal from kerogen, pyrite removal from Illinois a6 coal by Fig. 3. TOF-SIMS spectra for the cation part of CrCl 2 treated Illinois a6 coal.

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Removal of pyrite from coal using bacteria Semantic Scholar

Corpus ID: 100433327. Removal of pyrite from coal using bacteria @article{Beier1985RemovalOP, title={Removal of pyrite from coal using bacteria}, author={E. Beier}, journal={Coal science and technology}, year={1985}, volume={9}, pages={653-672} }

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Pyrite removal from Illinois #6 coal by CrCl2 reduction ...

Abstract Pyrite was removed from Illinois #6 coal by HF/HCl washes and by CrCl 2 reduction. The effect of pyrite on the coprocessing of Illinois #6 coal with waste automotive oil was investigated. ICP results show that the standard HF/HCl treatment still leaves about 65% of the pyrite in the Illinois #6 coal, but acidic CrCl 2 reduction can remove 95.9% of the pyrite from the same coal without ...

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Electrostatic Separation of Pyrite From Coal

Apr 16, 1994  This paper reviews the various forms of electrostatic separation available to remove sulphur, in the form of pyrite (FeS 2 ) from coal. Research has been carried out to desulphurise coal using an electrostatic roll separator which uses the corona charging technique. Data is presented here to conflict with previous reports that indicated that the electrostatic roll separator is unable to ...

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Leaching Pyrite From Coal Waste: Results of Diagnostic Study

removal of pyrite from coal and coal waste (3),4 (3) the recovery of fuels from coal wastes, (4) the evaluation of groundwater contamination from mine wastes (4), and (5) the removal of solutes onto solid substrates (5).5 The leaching process involves a coupling of chemical reactions and transport phenomena in a multicomponent, multi­ ...

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coal mill pyrites removal - greenrevolution

Jun 26, 2013  coal mill in power plant pyrite - YouTube. Jun 26, 2014 ... Coal powder mill applied at coal fired power plant and thermal coal ... mill pyrites removal -

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Use of Polyxanthate Dispersant for Ultrafine Pyrite ...

May 21, 2007  (1988). Use of Polyxanthate Dispersant for Ultrafine Pyrite Removal from High Sulfur Coal by Selective Flocculation. Coal Preparation: Vol. 6, No. 1-2, pp. 35-51.

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Reprinted from COAL, Kural,O.,ed., Istanbul Tech. Univ., p ...

Figure 20.4 Bioprocess variables in pyrite removal (Olson and Brinckman. 1986). 20.2.2 Microbial Cleaning A breakthrough has reportedly been achieved ... Coal pyrite, as opposed to mineral pyrite, is reduced by hydrogen to H2S at temperatures as low as 250°C. Pyrite in the presence of an

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Occurrence and morphology of pyrite in Bulgarian coals ...

Mar 01, 1996  International Journal of ELSEVIER International Journal of Coal Geology 29 (1996) 273-290 Occurrence and morphology of pyrite in Bulgarian coals Jordan Kortenski a,*, Irena Kostova b ' University of Mining and Geology, Softy 1156, Bulgaria " Institute q/ Applied Mineralogy, Bulgarian Academy of Science, Sofia 1000, Bulgaria Received 2 November 1994; accepted 30 August 1995

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Natural pyrite to enhance simultaneous long-term nitrogen ...

Jan 01, 2019  Therefore COD removal between the PCW and LCW did not show significant difference in the three year's operation. As some unconventional mineral substrates, such as shale, coal slag, zeolite, etc., were used in CWs, the removals of COD and NH 4 +-N varied from 23% to 84%, and from 26% to 100%, respectively (Saeed and Sun, 2012).

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TRACE METAL CONTENT OF COAL AND ASH AS DETERMINED

These data confrm that coal cleaning processes which remove pyrite are likely to be suitable for trace metal emissions control. In addition, back-end control devices which target specific types of ash particles may be helpful for control of air toxics emissions. INTRODUCTION

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Study on Preparation and Mechanism of Pyrite (FeS2 ...

Nantong coal samples with 1.40% sulfur, and pyrite removal rate reached 63% by using mercaptoacetic acid as an inhibitor of float coal to depress pyrite. High Gradient Magnetic Separation The pyrite in coal generally has paramagnetic, while coal is diamagnetic. They can be separated by the

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