US3993455A US05 354 023 US35402373A US3993455A US 3993455 A US3993455 A US 3993455A US 35402373 A US35402373 A US 35402373A US 3993455 A US3993455 A US 3993455A Authority US United States Prior art keywords coal mineral matter pyrite reaction mixture acid Prior art date 19730625 Legal status The legal status is an assumption and is not a legal conclusion

1982413 ensp 0183 enspRemoval 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

The objective of this project was to investigate the possibility of improving the magnetic separation of pyrite from coal by enhancing the magnetic susceptibility of pyrite in runofmine ROM

The pretreatment of high sulphur coal by electrolysis reduction can reduce oxygencontaining functional groups on coal surface and increase the hydrophobicity While the reduction of the initial oxidized products on pyrite surface such as polysulphide and free

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 a fixed Po2 were the bacterial strain the nitrogen phosphorus molar ratio

2018328 ensp 0183 enspBall milling and hardgrove milling were used to pulverize the coal Three coals from the Pittsburgh seam were treated by the dryremoval process Over 55 percent of the pyrite which amounted to 70 percent of the available pyrite was removed in a reject of 10 to 20 percent from one of the coals

20191013 ensp 0183 enspOil agglomeration is an excellent technique for the beneficiation of fine coal For separation of the spherical agglomerates by screening a high level of oil must be used however When the subsequent separation is done by flotation this disadvantage is eliminated Better pyrite removal

20 Shuai Wang Yaqun He He Jingfeng Ge Linhan Liu Qing Experiment and simulation on the pyrite removal from the recirculating load of pulverizer with a dilute phase gassolid fluidized bed J International Journal of Mining Science and Technology 2013 23

Enhancement of A by physical coal cleaning may be attributed to the removal of coal particles containing pyrite having a low specific surface area or low accessibility isolation by the matrix material Thus pyrite removal rates may be increased by coal size reduction and or physical cleaning

20191120 ensp 0183 enspAnother objective of the investigation was to determine if the pyrite in the waste could be recovered for possible marketing Samples of washer waste were obtained from two impoundments One sample was representative of waste generated during the washing of steam coal from the American Pratt and Nickel plate seams in Alabama

It has been shown from the research that after the coal and pyrite is treated by electrochemical process the modified property of the two parts is towards opposite direction This provides theoretical basis on which sulphur removal from high sulphur coal can be

The influence of certain process variables such as coal pulp density particle size and initial cell number density on the rate of pyritic sulfur removal were determined A pulp density of 20 particle size of D 175 p lt 48 μm and an initial cell number density of 10 12 cells g pyrite in coal were found to be optimal The carbon dioxide

2018101 ensp 0183 enspThe utilization of nitrogen and energy sources by Thiobacillus ferrooxidans was investigated and the removal of sulfur from coal pyrite exposed to the air for different time was studied

200251 ensp 0183 enspPyrite removal from Illinois 6 coal by CrCl2 reduction and effect of pyrite on the coprocessing of Illinois 6 coal with waste automotive oil Fuel Processing Technology 1999 59 23 7994 DOI 10 1016 S03783820 99 000120 Jeffrey S Seewald Bryan C BenitezNelson Jean K Whelan

2016128 ensp 0183 enspSkip navigation

20151227 ensp 0183 enspsubstantial PSR thus indiing specificity of Thiobacillus ferrooxidans for pyrite removal This study indies that the method 2 is a much better process for pyrite removal as compared to the method 1 High PSR 82 799 1 and cleaner coal product with increased calorific value were obtained in short period 2 5

Summary The microbial oxidation of pyritic sulphur was studied in a 4 5l airlift fermentor at pH 1 5 and 100 g l pulp density By microbial leaching with Leptospirillumlike bacteria 85 of the pyritic sulphur was removed within 40 days 30 of the removed pyrite was oxidized to elemental sulphur the rest being transformed to soluble sulphate Accumulation of elemental sulphur could be