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  • On Improving the Separation Efficiency of a Wet High Gradient

    Results showed that, at the optimum separation conditions, i.e., 10 l/h feeding rate, 5% pulp density, 2200 Gauss, and 0.6% canister loading, a coal concentrate assaying 0.57% pyritic sulfur was obtained with a recovery 58% and separation efficiency 79.34%. KEYWORDS: WHGMS, elMaghara coal, pyrite removal, canister 

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  • Untitled

    Coal recovery increased as the salt concentration was raised, whereas pyrite recovery decreased. Consequently, the separation efficiency was improved by increasing the particularly to the separation of mixtures of coal and pyrite by oil agglomeration in . energy to insure complete removal of trapped air. The deaerated 

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  • Removal of pyrite from coal by conditioning with Thiobacillus

    A novel process that can reject as much as 90% of the pyrite from finely divided coal is described. Cells of Thiobacillus ferrooxidans are mixed with an aqueous slurry of the coal and the mixture is vigorously agitated for as little as 15 min. Pyrite is apparently rendered hydrophilic and is rejected with the tailings when the 

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  • Bacterial removal of pyrite from coal Science Direct

    (Keywords: coal sulphur bacterial removal). It has been known for many years that bacteria of the genus Thiobacillus could remove pyritic sulphur from coal'. Recently there has been a resurgence of interest in this process' 5, and several researchers have demon strated 90 wt% pyrite removal from pulverized coal in.

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  • Desulfurization of coal by oxidation in alkaline solution Iowa State

    63. Effect of acid treatment. 69. Sodium bicarbonate solution. 71. Effect of temperature. 71. Effect of concentration. 73. Effect of sodium sulfate. 73. Comparison of different alkalis. 76. Removal of organic sulfur from precleaned coal. 78. Twostep leaching. 84. Desulfurization of CoalDerived Pyrite. 87. Conversiontime data.

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  • Demineralization and Desulfurization of Subbituminous Coal with

    Nalwalk and coworkers7 also reported that pyrite in coal can be slowly oxidized to sulfate by treatment with 30 wt % H2O2. Smith8 investigated desulfurization of coals of U.S. origin with. 1015 wt % H2O2 alone and in the presence of sulfuric acid. He observed high level pyritic sulfur and ash removal by peroxide alone, 

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  • Dry Separation of Pyrite from Coal

    A dry separation process for removing pyrite from fine coal by use of centrifugal and electrostatic methods removed 305070 of the total pyritic sulfur (equivalent to 5070% of the available pyritic sulfur). Both separation methods were benefited by restricting particle size range and keeping pyrite particles as large as possible.

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  • Studies on the effect of coal particle size on De Gruyter

    have been tested to remove the sulfur and pyrite content from coal1. However, the physical methods employed for coal depyritization suffer problems such as loss of combustible portion of coal and inadequate removal of mineral matter embedded in its matrix. On the other hand, the chemical methods employed were found 

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  • DRY SEPARATION OF PYRITE FROM COAL

    U. S. Department of the Interior, Bureau of Mines. Morgantown Energy Research Center. Morgantown, West ia 26505. ABSTRACT. A dry separation process for removing pyrite from fine coal utilizing centrifugal and electrostatic methods removed 35 to 55 percent of the total pyritic sulfur (amounting to 70 to 100 percent.

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  • The Removal of Organic Sulfur from Two Turkish CiteSeerX

    The utilization of coals for both energy production and various coal conversion processes is limited by the presence of sulfur in the coal. The high sulfur dioxide emissions caused by the utilization of coals as a major fossil fuel leads to worldwide environmental problems. Sulfur in coal occurs in various forms: pyrite, 

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  • Coal and other Fuels Sorting :

    Coal sorting equipment powered by TOMRA Sorting Solutions. XRay transmission sorters deshale coal. less low value material and, as destoned coal burns better, obtaining higher prices for their output. Heavymetal removal: Our technology allows pyrite and heavy metal to be detected and separated from coal.

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  • Bacterial removal of pyrite from coal ScienceDirect

    The bacterial process for removing pyritic sulphur from coal deserves attention because it has low operating costs and fits naturally into any project in which coal is slurried in water. A kinetic model is presented for use in the design of bacterial desulphurization systems, based on the fact that bacteria can attack a pyritic 

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  • AluminumEnhanced Coal Pyrite Leaching during SO2 Removal

    Jun 6, 2016 Abstract During SO2 removal from flue gas by coal slurry scrubbing, coal pyrite sulfur can be simulta neously reduced. But satisfactory coal pyrite conver sion cannot be achieved under normal scrubbing conditions. In the present work, aluminum oxide and aluminum sulfate were tested as additives to.

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  • DRY SEPARATION OF PYRITE FROM COAL

    U. S. Department of the Interior, Bureau of Mines. Morgantown Energy Research Center. Morgantown, West ia 26505. ABSTRACT. A dry separation process for removing pyrite from fine coal utilizing centrifugal and electrostatic methods removed 35 to 55 percent of the total pyritic sulfur (amounting to 70 to 100 percent.

    Online
  • Enhanced separation of pyrite from oxidized coal by froth flotation

    The pyrite surface in the coal slurry was selectively made more hydrophilic by adapted Thiobacillus ferrooxidans bacteria, thereby depressing the floatability of pyrite, but not that of coal. After bioconditioning and removal of the bacterial culture, the coal slurry was subjected to froth flotation at pH 8. The bioconditioning of 

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  • Modes of arsenic occurance in coal slime and its removal: a case

    Waugh and Bowling, 1984 reported 90% reduction of the mineral matter content of an Australian coal after a caustic wash. Pietrzak and Wachowska (2006) considered that treatment with HNO3 is effective for the removal of pyrite in coal desulphurization. As the harmful trace elements generally occur in minerals (e.g. pyrite 

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  • PYRITE SURFACE CHARACTERIZATION AND OSTI.GOV

    In many U.S. coal deposits, pyritic sulfur is predominant and its removal from the coal could meet acid rain control legislation standards. The first requirement for the removal of intimately locked fine pyritic sulfur from coals is to grind the coal to an ultrafine size to liberate pyrite particles. Such ultrafine pyrite particles cannot 

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  • Innovative Design of Fine Coal Cleaning Circuits for Improved Sulfur

    Jul 22, 2013 Flotation is a surfacebased process that is effective in removing ashforming minerals such as clay, while enhanced gravity concentration is a densitybased process that is more efficient in rejecting highdensity minerals and middlings that contain pyrite. By combining two processes into a single circuit, 

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  • Comparison Analysis of Coal Biodesulfurization and Coal's Pyrite

    Oct 27, 2013 Acidithiobacillus ferrooxidans (A. ferrooxidans) was applied in coal biodesulfurization and coal's pyrite bioleaching. The result showed that A. ferrooxidans had significantly promoted the biodesulfurization of coal and bioleaching of coal's pyrite. After 16 days of processing, the total sulfur removal rate of coal 

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  • AluminumEnhanced Coal Pyrite Leaching during SO Removal with

    Abstract: During SO 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 

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  • Kinetics of the Removal of Iron Pyrite from Coal by Microbial Catalysis

    ABSTRACT. Different strains of Thiobacillus ferrooxidans and Thiobacillus thiooxidans were used to alyze the oxidative dissolution of iron pyrite, FeS2, in nine different coal samples. Kinetic variables and parametric factors that were determined to have a pronounced effect on the rate and extent of oxidative dissolution at 

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  • Comparison Analysis of Coal Biodesulfurization and Coal's Pyrite

    Oct 27, 2013 Acidithiobacillus ferrooxidans (A. ferrooxidans) was applied in coal biodesulfurization and coal's pyrite bioleaching. The result showed that A. ferrooxidans had significantly promoted the biodesulfurization of coal and bioleaching of coal's pyrite. After 16 days of processing, the total sulfur removal rate of coal 

    Online
  • Enhanced separation of pyrite from oxidized coal by froth flotation

    The pyrite surface in the coal slurry was selectively made more hydrophilic by adapted Thiobacillus ferrooxidans bacteria, thereby depressing the floatability of pyrite, but not that of coal. After bioconditioning and removal of the bacterial culture, the coal slurry was subjected to froth flotation at pH 8. The bioconditioning of 

    Online
  • CHEMICAL REMOVAL OF PYRITIC SULFUR FROM COAL

    order to determine whether or not the acid had any effect on pyrite and ash removal, sulfate/sulfur ratio, final heat content and whether high HC1 concentrations chlorinated the coal. tuents, increased ash removal was expected as well as some suppression of the sulfate to sulfur ratio since the reaction that results in sulfate.

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  • Dry Separation of Pyrite from Coal

    A dry separation process for removing pyrite from fine coal by use of centrifugal and electrostatic methods removed 305070 of the total pyritic sulfur (equivalent to 5070% of the available pyritic sulfur). Both separation methods were benefited by restricting particle size range and keeping pyrite particles as large as possible.

    Online
  • Bacterial removal of pyrite from concentrated coal slurries

    pyrite in finely ground coal. In 710 days 90% removal of pyritic sulfur has been reported by several researcher^.'^. This work could be the basis for the bacterial desulfuriza tion of coal on a commercial scale in order to alleviate the problem of acid rain. The economic feasibility of a commercial process has been studied by 

    Online
  • The removal of pyritic sulfur from coal employing thiobacillus

    stirred reactors and reported pyrite removals of 6098% in time periods of 410 day^.^,^,'^ These results have led to speculation that a largescale coal desulfurization might be possible in coal slurry pipelines. The prob lems of corrosion, product removal (ferric salts and sulfuric acid) and oxygen availability, however, have.

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  • Study on Preparation and Mechanism of Pyrite DPI Proceedings

    calcium hydrogen sulfide, volatile sulfide gas and sulfur or sulfate which is easy to remove by using strong acid, strong alkali and strong oxidizing agent and other chemical reagents. This is of great significance to separate dispersively fineparticle and disseminated pyrite from coal. Although the chemical method can be 

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  • Electrostatic Separation of Pyrite From Coal Hindawi

    Abstract. 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 electrostatic roll separator which uses the corona charging technique. Data is presented here to conflict with previous 

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  • Bacterial removal of pyrite from concentrated coal slurries

    pyrite in finely ground coal. In 710 days 90% removal of pyritic sulfur has been reported by several researcher^.'^. This work could be the basis for the bacterial desulfuriza tion of coal on a commercial scale in order to alleviate the problem of acid rain. The economic feasibility of a commercial process has been studied by 

    Online
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