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Operational tests on combined flocculation in coal processing
01
96/02393 Nomography to determine the yield of coal beneficiation products Korsak, L. L. Koks Khim., 1995, (2). (In Russian) Presents a nomographic method of determination of the yield of coal beneficiation products. 96/02394 Operational tests on combined flocculation In coal processing Kaiser, M. Aufbereii-Tech., 1995, 36, (8), 358-364. Pilot-plant tests were presented for the use of flocculants in coal processing (especially flotation), with emphasis on anionic high-molecular-weight polyacrylamide-based flocculants (containing 10-40 wt.% acrylates, with d.p. 200,000). 96/02395 Particle shapes produced by comminution In the Szego Mill Trass, O. et al., Part. Syst. Charact., 1995, 12, (3), 158-165. Presents a study of particle shape and breakage mechanisms in different coal grinding operations in the mill. Discusses dry grinding, slurry grinding, and coal-oil-water grinding. 96/02396 Pore entry effects In the solvent-induced swelling of low-rank coals Jones, J. C. and Prawitasari, B. l. Chern. Technol. Biotechnol., 1995, 64, (2), 210-212. The swelling of a low-rank coal (Loy Yang, Latrobe Valley, Australia) in the presence of various solvents was examined and the results were compared with swelling data from a briquetted coal of similar rank. The results were interpreted in terms of the effects of briquetting on pore structure. 96/02397 Precombustion control options for air toxlcs Akers, D. J. and Harrison, C. D. Prepr. Pap-Am. Chern. Soc., Div. Fuel Chem... 1995, 40, (4), 823-827. Coal cleaning techniques are effective in removing ash-forming mineral matter along with many mineral-associated trace elements from coal. Data from commercial-scale cleaning tests indicate that trace elements reduction tends to increase as ash reduction increases. However, factors such as the mode of Occurrence of the trace-element-bearing mineral and the type of cleaning equipment also affect trace element reduction. There is evidence that advanced coal cleaning processes can provide higher reductions of some trace elements than conventional process. 96/02398 Preparation of SW desulfurlzer with pyrite cinder Yang, Y. and Wei, T. Liusuan Gongye, 1995, (2), 48-50. (In Chinese) The paper describes the preparation of desulphurization agents from pyrite cinder containing 45-50% Fe.O, for H2S removal from coal gas and marsh gases. 96/02399 Reactor systems for microbia! desulfurlzatlon of coal: An overview Raman, V. K. et al., Crit. Rev. Environ. Sci. Technol., 1995, 25, (3), 291-312. Discusses the cost-effectiveness of microbial coal desulphurization which is dependent on the type of reactor system used. Technical and economic aspects of various bioreactor systems and desulphurization processes are discussed. 96/02400 Reliability of the technological process for the production of lumped peat Zharavlev, A. V. lzv. Vyssh. Uchebn. Zaved., Gorn. Zh., 1995, (2), 43-46. (In Russian) Discusses the technological aspects of the production of lumped peat. 96/02401 Role of Iron catalyst Impregnated by solvent swell· Ing method In pyrolytlc removal of coal nitrogen Hayashi, J. et al., Energy Fuels, 1995, 9, (6), 1028-1034. Organometallic iron precursors, ferrocene and ferric acetate, were impregnated into Illinois No.6 (IL), Wyoming (WY), and Yallourn (YL) coals by solvent swelling technique in THF, ethanol, and a THF/ethanol binary solvent. Then iron-impregnated coals were pyrolyzed in a flow of helium at atmospheric pressure in a fixed bed and a thermobalance. Conversion of coal nitrogen to N2 was 20, 38, and 30%, respectively for original IL, WY, and YL coals. 96/02402 Separation of unburned coal from coal ash Michihashi, H. (Assigned 10) Chichibu Onoda KK, lAP. Pal. lP.07,222,939, Aug. 1995.
Solid fuels (preparation)
96/02403 Separators in grinding circuits Onuma, E. and Ito, M. Verfahrenstech. Zementhersteli., 4th VDl-Kongr., (1993) Bauverlag, Wiesbaden, Germa/lY, 1995, 660-672. Conventional separators in grinding plants for raw meal, coal and cement have often shown rather poor separation performances. The recently developed high-efficiency separators are especially noted for their markedly improved separation performance and sharpness of separation. The mode of operation of a separator may be characterized advantageously by the shape of the Tromp separation curve, which shows the selectivity as a function of the particle grain size. Modern separators are used in grinding plants with ball mills, roller mills and high-pressure grinding rolls. 96/02404 Some characteristics of pelletlzation of coal slurries with Iignosulfonate Zalevskaya, G. N. et al., Khim. Tverd. Topl. (Moscow), 1995, (4), 57-61. (In Russian) Na lignosulphonate is used as a binder for coal pelletization from sludges. The pellets thus obtained are hydroscopic, and two methods are given for their hydrophobization with residual fuel oil. 96/02405 A study of particle separation in a spiral concentrator Atasoy, Y. and Spottiswood, D. J. Miner. Eng., 1995,8, (10), 1197-1208. In relation to modelling particle separation in a spiral trough, the distribution of coal particles across the cross-section of a spiral in a Reichert LD4 coal spiral is studied. 96/02406 StUdy on demineralization of coal by alkali/acid treatment under mild conditions Chen, C. et al., Huadong Ligong Daxue Xuebao, 1995,21, (3), 311-315. (In Chinese) Discusses demineralization of 81.0 and 90.0% for two Chinese coals. 96/02407 StUdy on the combined bacteria-emulsion process for coal desulfurlzatlon Chen, M. et al., Huanjing Kexue, 1995, 16, (2), 23-26. (In Chinese) Discusses the principles of a combined bacteria-emulsion process for removing sulphur from coal and experiments of coal desulphurization. 96/02408 Swelling behavior of O-alkylated APeS coals as examined by the EPR spin probe method Ding, R. et al., Prepr. Pap-Am. Chern. Soc., Div. Fuel Chem., 1995,40, (3), 425-429. Describes O-alkylation procedures which have been used to derivatize the carboxyl and hydroxyl groups in the Argonne Premium coals. 96/02409 The swelling of a low-rank coal In benzene-pyridine and toluene-pyridine mixtures Jones, J. C. and Prawitasari, B. 1. Chem. Technol. Biotechnol., 1995,64, (2), 207-209. A low-rank coal (Loy Yang, Latrobe Valley, Australia) was examined for swelling in benzene-pyridine and toluene-pyridine mixtures. 96/02410 Technology trends In froth flotation chemistry Klimpel, R. R. Min. E/lg. (Littleton, Colo.), 1995, 47, (10), 933-942. 96/02411 Thermodynamics of coal-derived fluids. 3. VLE and heat capacities of coal liquid fractions Kabadi, V. N. Fuel, Feb. 1996, 75, (3), 363-372. A previously developed thermodynamic model for vapour-liquid equilibrium (VLE) properties of coal-derived liquids has been successfully revised and extended to compute calorimetric properties of these liquids. The revised model, which is based on the modified UNIFAC correlation, predicts accurately the phase coexistence and calorimetric properties of low-temperature fractions (b.p. <600K). However, like the previous model, the revised model fails at higher temperatures, in part because of the limitation of the UNIFAC activity coefficient correlation which uses binary interaction parameters regressed from low-temperature VLE and enthalpy data. To improve the applicability of the model at higher temperatures, high-temperature VLE and liquid enthalpy data for coal model compounds are necessary. 96/02412 Water pollution profile of coal washerles Gupta, R. K. and Singh, G. Pollut. Res., 1995, 14, (2), 203-213. The study provides an insight into water pollution profile from coal washeries in Jharia Coal Field, India. Describes various process parameters/unit operations in coal washing. 96/02413 Wet bulk density control of fine aggregates Evans, J. M. US Pal. US.5,435,813, luI. 1995. The method and composition are provided for increasing packed bulk density of coal, whose surface moisture varies from 2 to 15 wt.%, to desired levels in the range of 45 to 50 lbs/fr', and for controlling and maintaining the improved bulk density.
Fuel and Energy Abstracts May 1996 173
96/02393 Nomography to determine the yield of coal beneficiation products Korsak, L. L. Koks Khim., 1995, (2). (In Russian) Presents a nomographic method of determination of the yield of coal beneficiation products. 96/02394 Operational tests on combined flocculation In coal processing Kaiser, M. Aufbereii-Tech., 1995, 36, (8), 358-364. Pilot-plant tests were presented for the use of flocculants in coal processing (especially flotation), with emphasis on anionic high-molecular-weight polyacrylamide-based flocculants (containing 10-40 wt.% acrylates, with d.p. 200,000). 96/02395 Particle shapes produced by comminution In the Szego Mill Trass, O. et al., Part. Syst. Charact., 1995, 12, (3), 158-165. Presents a study of particle shape and breakage mechanisms in different coal grinding operations in the mill. Discusses dry grinding, slurry grinding, and coal-oil-water grinding. 96/02396 Pore entry effects In the solvent-induced swelling of low-rank coals Jones, J. C. and Prawitasari, B. l. Chern. Technol. Biotechnol., 1995, 64, (2), 210-212. The swelling of a low-rank coal (Loy Yang, Latrobe Valley, Australia) in the presence of various solvents was examined and the results were compared with swelling data from a briquetted coal of similar rank. The results were interpreted in terms of the effects of briquetting on pore structure. 96/02397 Precombustion control options for air toxlcs Akers, D. J. and Harrison, C. D. Prepr. Pap-Am. Chern. Soc., Div. Fuel Chem... 1995, 40, (4), 823-827. Coal cleaning techniques are effective in removing ash-forming mineral matter along with many mineral-associated trace elements from coal. Data from commercial-scale cleaning tests indicate that trace elements reduction tends to increase as ash reduction increases. However, factors such as the mode of Occurrence of the trace-element-bearing mineral and the type of cleaning equipment also affect trace element reduction. There is evidence that advanced coal cleaning processes can provide higher reductions of some trace elements than conventional process. 96/02398 Preparation of SW desulfurlzer with pyrite cinder Yang, Y. and Wei, T. Liusuan Gongye, 1995, (2), 48-50. (In Chinese) The paper describes the preparation of desulphurization agents from pyrite cinder containing 45-50% Fe.O, for H2S removal from coal gas and marsh gases. 96/02399 Reactor systems for microbia! desulfurlzatlon of coal: An overview Raman, V. K. et al., Crit. Rev. Environ. Sci. Technol., 1995, 25, (3), 291-312. Discusses the cost-effectiveness of microbial coal desulphurization which is dependent on the type of reactor system used. Technical and economic aspects of various bioreactor systems and desulphurization processes are discussed. 96/02400 Reliability of the technological process for the production of lumped peat Zharavlev, A. V. lzv. Vyssh. Uchebn. Zaved., Gorn. Zh., 1995, (2), 43-46. (In Russian) Discusses the technological aspects of the production of lumped peat. 96/02401 Role of Iron catalyst Impregnated by solvent swell· Ing method In pyrolytlc removal of coal nitrogen Hayashi, J. et al., Energy Fuels, 1995, 9, (6), 1028-1034. Organometallic iron precursors, ferrocene and ferric acetate, were impregnated into Illinois No.6 (IL), Wyoming (WY), and Yallourn (YL) coals by solvent swelling technique in THF, ethanol, and a THF/ethanol binary solvent. Then iron-impregnated coals were pyrolyzed in a flow of helium at atmospheric pressure in a fixed bed and a thermobalance. Conversion of coal nitrogen to N2 was 20, 38, and 30%, respectively for original IL, WY, and YL coals. 96/02402 Separation of unburned coal from coal ash Michihashi, H. (Assigned 10) Chichibu Onoda KK, lAP. Pal. lP.07,222,939, Aug. 1995.
Solid fuels (preparation)
96/02403 Separators in grinding circuits Onuma, E. and Ito, M. Verfahrenstech. Zementhersteli., 4th VDl-Kongr., (1993) Bauverlag, Wiesbaden, Germa/lY, 1995, 660-672. Conventional separators in grinding plants for raw meal, coal and cement have often shown rather poor separation performances. The recently developed high-efficiency separators are especially noted for their markedly improved separation performance and sharpness of separation. The mode of operation of a separator may be characterized advantageously by the shape of the Tromp separation curve, which shows the selectivity as a function of the particle grain size. Modern separators are used in grinding plants with ball mills, roller mills and high-pressure grinding rolls. 96/02404 Some characteristics of pelletlzation of coal slurries with Iignosulfonate Zalevskaya, G. N. et al., Khim. Tverd. Topl. (Moscow), 1995, (4), 57-61. (In Russian) Na lignosulphonate is used as a binder for coal pelletization from sludges. The pellets thus obtained are hydroscopic, and two methods are given for their hydrophobization with residual fuel oil. 96/02405 A study of particle separation in a spiral concentrator Atasoy, Y. and Spottiswood, D. J. Miner. Eng., 1995,8, (10), 1197-1208. In relation to modelling particle separation in a spiral trough, the distribution of coal particles across the cross-section of a spiral in a Reichert LD4 coal spiral is studied. 96/02406 StUdy on demineralization of coal by alkali/acid treatment under mild conditions Chen, C. et al., Huadong Ligong Daxue Xuebao, 1995,21, (3), 311-315. (In Chinese) Discusses demineralization of 81.0 and 90.0% for two Chinese coals. 96/02407 StUdy on the combined bacteria-emulsion process for coal desulfurlzatlon Chen, M. et al., Huanjing Kexue, 1995, 16, (2), 23-26. (In Chinese) Discusses the principles of a combined bacteria-emulsion process for removing sulphur from coal and experiments of coal desulphurization. 96/02408 Swelling behavior of O-alkylated APeS coals as examined by the EPR spin probe method Ding, R. et al., Prepr. Pap-Am. Chern. Soc., Div. Fuel Chem., 1995,40, (3), 425-429. Describes O-alkylation procedures which have been used to derivatize the carboxyl and hydroxyl groups in the Argonne Premium coals. 96/02409 The swelling of a low-rank coal In benzene-pyridine and toluene-pyridine mixtures Jones, J. C. and Prawitasari, B. 1. Chem. Technol. Biotechnol., 1995,64, (2), 207-209. A low-rank coal (Loy Yang, Latrobe Valley, Australia) was examined for swelling in benzene-pyridine and toluene-pyridine mixtures. 96/02410 Technology trends In froth flotation chemistry Klimpel, R. R. Min. E/lg. (Littleton, Colo.), 1995, 47, (10), 933-942. 96/02411 Thermodynamics of coal-derived fluids. 3. VLE and heat capacities of coal liquid fractions Kabadi, V. N. Fuel, Feb. 1996, 75, (3), 363-372. A previously developed thermodynamic model for vapour-liquid equilibrium (VLE) properties of coal-derived liquids has been successfully revised and extended to compute calorimetric properties of these liquids. The revised model, which is based on the modified UNIFAC correlation, predicts accurately the phase coexistence and calorimetric properties of low-temperature fractions (b.p. <600K). However, like the previous model, the revised model fails at higher temperatures, in part because of the limitation of the UNIFAC activity coefficient correlation which uses binary interaction parameters regressed from low-temperature VLE and enthalpy data. To improve the applicability of the model at higher temperatures, high-temperature VLE and liquid enthalpy data for coal model compounds are necessary. 96/02412 Water pollution profile of coal washerles Gupta, R. K. and Singh, G. Pollut. Res., 1995, 14, (2), 203-213. The study provides an insight into water pollution profile from coal washeries in Jharia Coal Field, India. Describes various process parameters/unit operations in coal washing. 96/02413 Wet bulk density control of fine aggregates Evans, J. M. US Pal. US.5,435,813, luI. 1995. The method and composition are provided for increasing packed bulk density of coal, whose surface moisture varies from 2 to 15 wt.%, to desired levels in the range of 45 to 50 lbs/fr', and for controlling and maintaining the improved bulk density.
Fuel and Energy Abstracts May 1996 173