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Jun 26, 2013 Jun 26, 2013 ... non-waste fuel through its patented process of recovering coal ash material1 from its landlls and ... of unburned coal, fly ash, bottom ash, slag, coal debris, mill rejects. including pyrites. stone and metals and a small presence ofother ... as some monolls are decades old, removal of the coal ash helps. Read more
Jun 26, 2013 Jun 26, 2013... non-waste fuel through its patented process of recovering coal ash material1 from its landlls and... of unburned coal, fly ash, bottom ash, slag, coal debris, mill rejects. including pyrites. stone and metals and a small presence ofother... as some monolls are decades old, removal of the coal ash helps.
Acordingly1 relatively coarse coal particles can be acid leached and then treated for pyrites removal, liberation of pyrites by grinding alone would only be achieved at much finer particle size.. We have achieved excellent pyrites removal from coal by hydrofluoric acid leaching raw coal at particle sizes as coarse as Smm, and then using conventional scparation methods.
Aug 01, 1988 Thiobacilli may either attack coal-contained pyrite directly or contribute to its oxidation via catalysing the oxidation of ferrous salts by oxygen di
US4324560A US06127,346 US12734680A US4324560A US 4324560 A US4324560 A US 4324560A US 12734680 A US12734680 A US 12734680A US 4324560 A US4324560 A US 4324560A Authority US United States Prior art keywords coal pyrite organic media coarse Prior art date 1980-03-05 Legal status The legal status is an assumption and is not a legal conclusion.
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.
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 ...
Jun 06, 2016 During SO2 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 SO2 removal in a bubbling reactor.
Hence, sulfurous acid, but not HNO 3, H 2 O 2 or HOCl, provides an economical route to the removal of pyrites from coal. The data in Table 2 in the following example indicates that generally use of HCl when combined with sulfurous acid improves the removal of pyritic
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 ...
Aug 01, 1981 Abstract. Different strains of Thiobacillus ferrooxidans and Thiobacillus thiooxidans were used to catalyze the oxidative dissolution of iron pyrite, FeS 2, 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 a fixed Po 2 were the bacterial strain, the nitrogenphosphorus ...
Most of the free sulfur is volatized from the coal due to the heat drying additional free sulfur can be removed by additional washing and heat drying andor solvent extraction techniques. At least 60 percent of the pyrite sulfur and pyrite iron is removed using the process of this invention.
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.
Pyrite is removed from coal by crushing, air classification and organic heavy medium separation. A superior method is taught wherein only a fraction of the total coal treated need be treated with...
Pyrite is removed from coal by crushing, air classification and organic heavy medium separation. A superior method is taught wherein only a fraction of the total coal treated need be treated with organic media separation.
Silverman, M P. Removal of pyritic sulfur from coal by bacterial action. United Kingdom.
Aug 01, 1997 The coal contained 37.2 ash, 2.2 pyritic sulfur, and 2.9 total sulfur, and had previously been stage-crushed to pass 20 mesh. The coal was prepared for flotation by grinding 900 g of coal in 1.5 liter of distilled water 37.5 solids at its natural pH in
The processes taking place on the coal pyrite surfaces are limited by surface reaction rather than by aqueous diffusion. The mode of reaction at the coal pyrite surface also depends on the composition of the coal pyrite. It could be concluded from the results that pyrite removal from coal is possible by aqueous leaching in acidic conditions.
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.
The Bureau of Mines two-stage coal-pyrite flotation process was modified to provide a more concentrated final clean coal slurry underflow that could be dewatered economically by filtration or centrifugation. This was accomplished by doing the first-stage coal flotation step in the conventional manner with a slurry of about 8 percent solids but running the second-stage pyrite flotation step ...
Jan 01, 1991 At 20,000X, the coal pyrite surface began to appear smooth, although submicron particles were still observed attached to the surfaces. No porosity was observed at this level of analysis. Surface areas measured for coal pyrites have been attributed to surface roughness and porous grains.
coal mill pyrites removal - small ball mill grinder-feed , coal mill reject handling system pyrite china coal mill pyrites removal - SAMAC Crusher Screen Plate, SAMAC beneficiation , Dry mechanical conveyor plant for pyrites and coal dust , installation of mill motor to gear box vertical mill Mar 4, ,
Pyrite recovery mechanisms in coal flotation. International Journal of Mineral Processing, 1997. Timothy Eisele. Download PDF. Download Full PDF Package. This paper. A short summary of this paper. 37 Full PDFs related to this paper. READ PAPER. Pyrite recovery mechanisms in coal flotation.
Rejects are a mixture of different materials pyrites, stones, tramp iron, etc. with pulverized coal, requiring a reliable and safe removal system. Discharged from coal mills, the rejects are collected in pyrite boxes for temporary storage. fire in pyrite hopper of coal mill
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