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05640 Multistage process for deep desulfurization of fossil fuels
01 NV05622
The dynamics of slulcr and spiral separations Holland-Batt, A. B. Miner. Eng., 1995, 8, (1) 3-21. The paper examines sluice performance in relation to stratification length as a preliminary to the more complex issue of spiral length. Test results obtained from parallel sided sluices are analyzed and compared with computer based performance projections to determine how reltable the simulations are in forecasting actual results. Test results obtained from both coal and mineral spirals having varying numbers of turns are compared and it is found that separation continues down the full length of the troughs though at a diminishing rate. The sedimentation rates in coal separations suggest that five or six turn troughs may be needed and in addition the reversed product locations compared with mineral spirals indicate that repulpers are likely to be ineffective.
95105630
95lO5623
95105632
Effect of flotation agents on surface energy of pyrlts Wierzchowski, K. Probl. Mineralurgii, 1994, 28, 29-36. (In Polish) Describes the effect of coal flotation reagents on surface energy of coalmine pyrite. All the tested reagents changed the surface energy and the magnitude of the change depended on the reagents type. Agents with the composition similar to that used in flotation upgrading’of low rank coals lowered the surface energy of pyrite below the value of the surface energy observed. 95105624
Effect of heat treatment on the flotation of Turkish llgnltes Celik, M. S. and Seyhan, K. Coal Preparation, 1995, 16, (l), 65-79. Unlike bituminous coal which oxidize upon heat treatmenf, lower rank coals such as lignites have been found to exhibit improved hydrophobicity on heating. Microflotation tests, zeta potential and Infrared measurements have been carried out to understand the flotation behaviour of four different lower-rank coals of varying ash and moisture contents. While Yenikoy and Saray coals exhibited improved floatability, Alpagut and Soma coals showed either no improvement or adverse effect upon thermal treatment. The zeta potential values of heat treated samples showed drastic changes compared to the original sample. Interaction of anionic and cationic surfactants with the original and heat treated coals were tested to find out their effect on flotation. 95/05625 Effect of the composltlon of brown coal-llgnln brlquets on thelr water adsorptlon Saranchuk,V. I. et al., Khim. Tvera! Topl. (Moscow), 1995 (l), 39-43. (In Russian) Describes how in order to protect the briquets from atmospheric and mechanical action during their storage, a layer of gatch was applied.
Solidfuels(preparation)
An lnvestlgatlon Into the thsrmal behavlour of Bangladsshl coals Podder, J. et al., Thermochim. Acta, 1995, 255, 221-226. Discusses DTA and thermogravimetric analysis studies carried out to investigate the thermal behaviour of Bangladeshi coals.
95lO5531 lnvestlgatlon of the removal of ash, sulfur and other contaminants from coal by wet magnetic separation Karma& V. I. et al., Magn. Electr. Sep., 1995, 6, (l), l-18. Presents the results of wet magnetic beneficiation of finely groung coals by high-gradient magnetic separation with the aim to remove deleterious and toxic impurities. Manufacture of coal brlauets for formed coke Nushishiro, K. er al., (Assigned to) K&asaki Steel Co., JAP. Pat.
JP.O7,11,257, Jan. 1995.
.
95105633
Manufacture of formed coke by carbonlzatlon of coal brlquets Igawa, K. et al., (Assigned to) Kawasaki Steel Co., JAP. Pat.
JP.O7.03,309. Jan. 1995.
Describes a process where formed coke is manufactured by heating coal with 30% or more volatile content at 500-600” to obtain char, mixing the obtained char, under heating at 200-300“, with tar generated from devolatilization. The powdered coal is then mixed to obtain coal briquets followed by carbonization. 95105634 Manufacture of formed coke from coal brlquets Tobo, H. et al., (Assigned to) Kawasaki Steel Co., JAP. Pat. 07,18,261,
Jan. 1995.
A process is carried out by blending coals with different volatile content in certain location, with a binder to form coal briquets with different coal in certain location, and followed by carbonization. 95105635 Mechanlem of hydrogen transfer reactions In coals at low temperatures Shen, J. et al., Nippon Enerugt Gakkaishi, 1995, 74, (51, . , 272-279. (In Japanese) __ Discusses the heat treatment of coal, and the relation between coal solubilization and hydrogen from solvents, and the origin of coal radicals. 95105636
Method for cleaning coal In coal preparatlon Matsuo, K. et al., (Assigned to) Mitsui Shipbuilding Eng., JAP. Pat.
JP.O7,18,279, Jan. 1995.
(
95lO5626
Effects of surface treatment on cation exchange properties of Australlan brown coals Murakami, K. et al., Fuel Process. Technol., 1995, 43, (l), 95-110. The cation exchange properties of Australian brown coals were investigated aiming at clarifying the influence of surface treatments. Dry heat treated and hydrothermally treated samples were used. Extent of cation exchanne increased with increasine“1 DH of solution. It was con- IECE) . eluded that the main factor determining ECE on brown coals is a cation’s accessibility to carboxyl groups which varies significantly with the pH of solution. 95105627
Electrostatic separation of pyrite from coal Butcher, D. A. and Rowson, N. A. Magn. Electr. Sep., 1995,6, (l), 19-30. Various forms of electrostatic separations are available io remove sulphur in the form of pyrite from coal. Presents data to prove that the electrostatic roll separator is able to separate pyrite from coal. Separation was undertaken under various atmospheric conditions, with various feed pretreatments. 95105626 A tactorlal design Investigation of the parameters affectlng the performance of an air-sparged hydrocyclone (ASH) treating a South Atrlcan coal Breed, A. W. and Franzidis, J. P. Coal Preparation, 1993, 16, (l), 81-101. A fractional factorial design was carried out to determine the relative effects of various design and operating parameters on the performnace of a 46 mm diameter Air-Sparged Hydrocyclone (ASH) in treating a sample of fines from a South African (Witbank) Colliery. The effect of (feed) pulp density was also investigated. The overall results indicated that the ASH beneficiated the coal successfully at capacities of up to 300 times those possible in conventional (batch) flotation, and in the region of 1500 times those achieved using the same coal in a column cell. The underflow configuration was found to be the most important design parameter, better results were achieved using an orifice with a horizontal baffle located above it as opposed to the conventional pedestal and annular opening configuration. A further lnvestlgatlon of the novel multi-stage agltated column for fine coal benetlclatlon He, D. X. and Chiang, S. H. Fluid/Part. Sep. J., 1994,‘7, (4), 137-139. Describes a multi-stage agitated column equipped with a contactor to improve the recovery of the clean coal. 95105529
95105637
Method of reducing Inorganic and organic sulfur In solid carbonaceous materlal prior to use of the solid carbonaceous material. Savage, R. L. and Lazarov, L. K. (Assigned to) Ohio University, US Pat. VS.5,382,267,
Jan. 1995.
95105636
Microbial desulturlzatlon of coal with emphasis on Inorganic sulfur Larsson, L. et al., Biol. Degrad. Biorem. Toxic Chem., Dioscorides Press, Portland, Or., USA, 1994, 493-505. Discusses the use of microorganisms (especially bacteria) to desulphurize coal. The most commonly studied desulphurizing bacteria are of the genera Thiobacillus, Sulfolobus, Acidianus, and Pseudomonas, which can convert the sulphur to water-soluble sulphate. 95105639 Mlgratlon of chemical elements during superhlghfrequency drying of water-coal mixtures Golovina, V. V. et al., Khim. Tverd. Topl. (Moscow), 1995, (l), 74-77. (In Russian) The paper discusses the transfer of elements from a brown coal to the water phase during superhigh-frequency drying of coal water mixtures. 95lO5540
Multistage process for deep desulfurlzatlon of tossll fuels Monticello, D. J. (Assigned to) Energy BioSystems Corp., US Pat. US.5,387,523, Feb. 1995.
A method of deeply desulphujzing a fossil t;l wt;i:hantains a variety of are ltable to organic sulphur compounds, some hydrodesulphurization (HDS) and some of which are refractory to HDS. A fossil fuel is produced which does not generate sufficient levels of hazardous, sulphur-containing combustion products that it requires post-combustion desulphurization- when it is burned. Moreover! _the deeply desulphurized fossil fuel can be produced using only a mdd HDS treatment; rather than re uiring conditions which may be-severe enough to be detrimental to the XIel value of the desired oroduct. The biocatalvst employed in the biocatalytic desulphurization sta’ge of the instant invenvtion is capable of catalyzing the sulphur-specific, oxidative cleavage of organic carbon-sulphur bonds in sulphur-bearing aromatic heterocyclic molecules.
Fuel and Energy Abetracts November 1995 405
The dynamics of slulcr and spiral separations Holland-Batt, A. B. Miner. Eng., 1995, 8, (1) 3-21. The paper examines sluice performance in relation to stratification length as a preliminary to the more complex issue of spiral length. Test results obtained from parallel sided sluices are analyzed and compared with computer based performance projections to determine how reltable the simulations are in forecasting actual results. Test results obtained from both coal and mineral spirals having varying numbers of turns are compared and it is found that separation continues down the full length of the troughs though at a diminishing rate. The sedimentation rates in coal separations suggest that five or six turn troughs may be needed and in addition the reversed product locations compared with mineral spirals indicate that repulpers are likely to be ineffective.
95105630
95lO5623
95105632
Effect of flotation agents on surface energy of pyrlts Wierzchowski, K. Probl. Mineralurgii, 1994, 28, 29-36. (In Polish) Describes the effect of coal flotation reagents on surface energy of coalmine pyrite. All the tested reagents changed the surface energy and the magnitude of the change depended on the reagents type. Agents with the composition similar to that used in flotation upgrading’of low rank coals lowered the surface energy of pyrite below the value of the surface energy observed. 95105624
Effect of heat treatment on the flotation of Turkish llgnltes Celik, M. S. and Seyhan, K. Coal Preparation, 1995, 16, (l), 65-79. Unlike bituminous coal which oxidize upon heat treatmenf, lower rank coals such as lignites have been found to exhibit improved hydrophobicity on heating. Microflotation tests, zeta potential and Infrared measurements have been carried out to understand the flotation behaviour of four different lower-rank coals of varying ash and moisture contents. While Yenikoy and Saray coals exhibited improved floatability, Alpagut and Soma coals showed either no improvement or adverse effect upon thermal treatment. The zeta potential values of heat treated samples showed drastic changes compared to the original sample. Interaction of anionic and cationic surfactants with the original and heat treated coals were tested to find out their effect on flotation. 95/05625 Effect of the composltlon of brown coal-llgnln brlquets on thelr water adsorptlon Saranchuk,V. I. et al., Khim. Tvera! Topl. (Moscow), 1995 (l), 39-43. (In Russian) Describes how in order to protect the briquets from atmospheric and mechanical action during their storage, a layer of gatch was applied.
Solidfuels(preparation)
An lnvestlgatlon Into the thsrmal behavlour of Bangladsshl coals Podder, J. et al., Thermochim. Acta, 1995, 255, 221-226. Discusses DTA and thermogravimetric analysis studies carried out to investigate the thermal behaviour of Bangladeshi coals.
95lO5531 lnvestlgatlon of the removal of ash, sulfur and other contaminants from coal by wet magnetic separation Karma& V. I. et al., Magn. Electr. Sep., 1995, 6, (l), l-18. Presents the results of wet magnetic beneficiation of finely groung coals by high-gradient magnetic separation with the aim to remove deleterious and toxic impurities. Manufacture of coal brlauets for formed coke Nushishiro, K. er al., (Assigned to) K&asaki Steel Co., JAP. Pat.
JP.O7,11,257, Jan. 1995.
.
95105633
Manufacture of formed coke by carbonlzatlon of coal brlquets Igawa, K. et al., (Assigned to) Kawasaki Steel Co., JAP. Pat.
JP.O7.03,309. Jan. 1995.
Describes a process where formed coke is manufactured by heating coal with 30% or more volatile content at 500-600” to obtain char, mixing the obtained char, under heating at 200-300“, with tar generated from devolatilization. The powdered coal is then mixed to obtain coal briquets followed by carbonization. 95105634 Manufacture of formed coke from coal brlquets Tobo, H. et al., (Assigned to) Kawasaki Steel Co., JAP. Pat. 07,18,261,
Jan. 1995.
A process is carried out by blending coals with different volatile content in certain location, with a binder to form coal briquets with different coal in certain location, and followed by carbonization. 95105635 Mechanlem of hydrogen transfer reactions In coals at low temperatures Shen, J. et al., Nippon Enerugt Gakkaishi, 1995, 74, (51, . , 272-279. (In Japanese) __ Discusses the heat treatment of coal, and the relation between coal solubilization and hydrogen from solvents, and the origin of coal radicals. 95105636
Method for cleaning coal In coal preparatlon Matsuo, K. et al., (Assigned to) Mitsui Shipbuilding Eng., JAP. Pat.
JP.O7,18,279, Jan. 1995.
(
95lO5626
Effects of surface treatment on cation exchange properties of Australlan brown coals Murakami, K. et al., Fuel Process. Technol., 1995, 43, (l), 95-110. The cation exchange properties of Australian brown coals were investigated aiming at clarifying the influence of surface treatments. Dry heat treated and hydrothermally treated samples were used. Extent of cation exchanne increased with increasine“1 DH of solution. It was con- IECE) . eluded that the main factor determining ECE on brown coals is a cation’s accessibility to carboxyl groups which varies significantly with the pH of solution. 95105627
Electrostatic separation of pyrite from coal Butcher, D. A. and Rowson, N. A. Magn. Electr. Sep., 1995,6, (l), 19-30. Various forms of electrostatic separations are available io remove sulphur in the form of pyrite from coal. Presents data to prove that the electrostatic roll separator is able to separate pyrite from coal. Separation was undertaken under various atmospheric conditions, with various feed pretreatments. 95105626 A tactorlal design Investigation of the parameters affectlng the performance of an air-sparged hydrocyclone (ASH) treating a South Atrlcan coal Breed, A. W. and Franzidis, J. P. Coal Preparation, 1993, 16, (l), 81-101. A fractional factorial design was carried out to determine the relative effects of various design and operating parameters on the performnace of a 46 mm diameter Air-Sparged Hydrocyclone (ASH) in treating a sample of fines from a South African (Witbank) Colliery. The effect of (feed) pulp density was also investigated. The overall results indicated that the ASH beneficiated the coal successfully at capacities of up to 300 times those possible in conventional (batch) flotation, and in the region of 1500 times those achieved using the same coal in a column cell. The underflow configuration was found to be the most important design parameter, better results were achieved using an orifice with a horizontal baffle located above it as opposed to the conventional pedestal and annular opening configuration. A further lnvestlgatlon of the novel multi-stage agltated column for fine coal benetlclatlon He, D. X. and Chiang, S. H. Fluid/Part. Sep. J., 1994,‘7, (4), 137-139. Describes a multi-stage agitated column equipped with a contactor to improve the recovery of the clean coal. 95105529
95105637
Method of reducing Inorganic and organic sulfur In solid carbonaceous materlal prior to use of the solid carbonaceous material. Savage, R. L. and Lazarov, L. K. (Assigned to) Ohio University, US Pat. VS.5,382,267,
Jan. 1995.
95105636
Microbial desulturlzatlon of coal with emphasis on Inorganic sulfur Larsson, L. et al., Biol. Degrad. Biorem. Toxic Chem., Dioscorides Press, Portland, Or., USA, 1994, 493-505. Discusses the use of microorganisms (especially bacteria) to desulphurize coal. The most commonly studied desulphurizing bacteria are of the genera Thiobacillus, Sulfolobus, Acidianus, and Pseudomonas, which can convert the sulphur to water-soluble sulphate. 95105639 Mlgratlon of chemical elements during superhlghfrequency drying of water-coal mixtures Golovina, V. V. et al., Khim. Tverd. Topl. (Moscow), 1995, (l), 74-77. (In Russian) The paper discusses the transfer of elements from a brown coal to the water phase during superhigh-frequency drying of coal water mixtures. 95lO5540
Multistage process for deep desulfurlzatlon of tossll fuels Monticello, D. J. (Assigned to) Energy BioSystems Corp., US Pat. US.5,387,523, Feb. 1995.
A method of deeply desulphujzing a fossil t;l wt;i:hantains a variety of are ltable to organic sulphur compounds, some hydrodesulphurization (HDS) and some of which are refractory to HDS. A fossil fuel is produced which does not generate sufficient levels of hazardous, sulphur-containing combustion products that it requires post-combustion desulphurization- when it is burned. Moreover! _the deeply desulphurized fossil fuel can be produced using only a mdd HDS treatment; rather than re uiring conditions which may be-severe enough to be detrimental to the XIel value of the desired oroduct. The biocatalvst employed in the biocatalytic desulphurization sta’ge of the instant invenvtion is capable of catalyzing the sulphur-specific, oxidative cleavage of organic carbon-sulphur bonds in sulphur-bearing aromatic heterocyclic molecules.
Fuel and Energy Abetracts November 1995 405