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The technical feasibility of removing ultrafine pyrite from high sulfur coals by selective flocculation using poly acrylateacrylodithiocarbonate (or polyxanthate) dispersant was examined. The sulfur removal efficiency of the polyxanthate dispersant was tested on coal samples of the Pittsburgh No. 8 seam which were precleaned by heavy liquid separation ( = /cc) and then were dried and ...
Different strains of Thiobacillus ferrooxidans and Thiobacillus thiooxidans were used to alyze the oxidative dissolution of iron pyrite, FeS(2), in nine different coal samples.
· 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 indied that the electrostatic roll separator is unable to ...
Removal of sulfur (pyrite) from coal is therefore one of the most pressing needs in related fields of energy and clean environment. In addition, coals contain mineral matter (usually reported as ash in analysis) other than pyrite in amounts ranging from about 2 to about 40%. This mineral manner consists of a variety of noncombustible inorganic materials such as kaolinite, quartz, gypsum and ...
SO2 was removed from a gas stream using an apparatus, which included a 1L stirred reactor immersed in a thermostated oil bath. The reactor contained 60 g of 35−65 mesh coal in 600 mL of water. The apparatus also had two bubblers connected to the outlet of the reactor, each containing 1500 mL of 1 M NaOH solution. The flow rate of the gas was 30 mL/s and the temperature was varied from 21 to ...
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 the following equations: Primary: Oxidation reduction 4 FeS2 (pyrite) +3SO2 + 12 HCl > 4 FeCl3 + 11S + 6 H2O Secondary: Oxidation reduction 4 FeCl3 + FeS2 ...
· Nearly total removal of pyrite from Illinois #6 coal by CrCl 2 decreases the conversion yield of the coal to THF solubles to %, compared to % for untreated Illinois #6 coal and % for HF/HCl treated Illinois #6 when each of these coals is coprocessed with waste automotive oil under the same reaction conditions. This comparison of conversion yields of the coal further supports the ...
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 pyriticS/kg coal ...
· Pyrite has a significant effect on the spontaneous combustion of coal. The presence of pyrite can change the propensity of coal towards spontaneous combustion. The influences of various pyrite contents on the parameters of spontaneous combustion, such as index gases, temperature and released heat etc., were investigated in this study. Coal samples with different pyrite contents (0 %, 3 .
· In most operating coalcleaning plants, a significant amount of pyrite is recovered in the froth during flotation of highsulfur coal. Reducing the pyrite recovery first requires that the primary recovery mechanism should be identified, as different measures are required for reducing entrainment, lockedparticle flotation, or true hydrophobic flotation.
The sulfur content in coal ranges from to 5%, and it is an impurity that must be removed before burning coal, due to the toxic effects and acid rain caused by SO2 gas generated from sulfur ...
grained pyrite can be removed from coal, decreasing the content of pyriteassociated elements during combustion, whereas finegrained pyrite and the coal itself are less amenable to cleaning. In addition, coal utilization may contribute substantial amounts of these elements to the environment by processes other than combustion. Pyriterich coalmine wastes were deposited in or near drainages ...
· Even if you remove the "rust", your pyrites will not be shiny like the bright crystals from the mines of Peru, Spain etc. They will likely be very dull looking customers. If you want to try and make them bright and shiny, I think you would need to resort to lapidary processes like sanding off the outer layer of the pyrite and after a fine sanding, say with 600 grit, learn how to polish it ...
The preremoval of pyrite from the raw ore was necessary to reduce the concentration of iron ions in the leachate. The selective leaching of vanadium and iron has been one of the main concerns in the field of vanadium recovery from stone coal, but the source of iron ions and their release characteristics were still unclear. In this work, the dissolution of pyrite and its roasted product, under ...
Pyrite Removal From Coal Mining Machinery. Conversely, any technique developed to enhance pyrite removal from fresh coal could in effect be used to speed up natures process and the recovery of low pyrite coal from coal waste streams, both fresh and aged.
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