01 Solid fuels (preparation)

96/00055 Hydrodesulfurlzatlon of Athabasca fluid coke - Convarslon and mechanism Saha, C. and Tollefson, E. L. Can. .I. Chem. Eng., 1995,73, (2), 211-219. Reports on a study of hydrodesul coke for particle sizes of -74 + !

hurization of Athabasca (syncrude) fluid 3, -53 + 44, and -44 urn using a quartz

reactor. The results agreed with predictions of the shrinking core model, the rate being controlled initially by the gas film and chemical reaction resistances followed by control due to diffusion of H, through the increas- ing ash layer.

96lOOO63 Mathematical deacrlptlon of coal bland compact- Ing. II. Empirical models Strugala, A. Karbo-Energochem.-Ekol., 1995, 40, (l), 11-19. (In Polish) Describes the empirical mathematical models of a coal blend compacting for coking, and multinominal and regression models for description of porosity of a coal charge bed depending on its matrix, moisture content, and the system of coking chamber charging.

%%64 Method and apparatus for abeorblng hydrogen

96lOOO56 A hydrodynamic slmulatlon of mineral flotatlon. Part II. Surface chemical effects for coal-oil agglomerate flotation

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collection and flotation recovery.

Darcovich, K. and Capes, C. E. Powder Technol., 1995,83, (3), 225-232. Existing data on the surface. properties of coal-oil agglomerates were used as input parameters for a turbulent, three-phase, computational fluid dvnamics simulation of a flotation cell. The flow field in the cell was &solved in two dimensions and the local hydrodynamic conditions were used as the basis for estimating bubble-particle collisons leading to particle

Simonsson, E. ef al., WO.95,07,750, Mar. 1995.

(Assigned to) ABB Flaekt AB, PCT Int.

A method and apparatus for selectively removing, by liquid absorption,

Petukhov, V. N. et al., Russ. Pat. RU.2,019,303, Sep. 1994.

hydrogen sulphide from a gas containing both hydrogen sulphide and car- bon dioxide.

96lOOO65 Method for flotatlon of coal using karoslne-gas oil fraction as collector

96lOOO57 Hydropyrolysls of coals. I. Hydropyrolysls of Llngwu bituminous coal Li. B. Ranliao Huaxue Xuebao. 1995. 23. (11. 57-61. (In Chinese) Discusses the hydropyrolysis of’chinese I&&u bitu&inous coal ‘under 0.2-4 MPa and 773-1073 K in a 100-g fixed-bed reactor. The results are compared with those obtained from pyrolysis under helium.

96/00056 An Improved method for extracting sulfate from bituminous coals using formic acid Louie, P. K. et al., Fuel, Oct. 1995, 74, (lo), 1480-1484. In connection with the determination of sulphate S, the sulphur mass bal- ance for four bituminous coals was determined using different extraction procedures, including use of 1 M and 4.8 M HCI under nitrogen and under air, and at room temperature, 95°C and boiling point. Since HCI extraction yielded poor S mass balances (as low as 83%), acid extraction with formic acid was also evaluated. Extractions with formic acid gave better S mass balances than those obtained using HCI, and the sulphate S yields agreed with those measured by the ASTM D-2492 HCI procedure. %/‘*C ratios determined by stable sulphur isotope mass spectrometry demonstrated that formic acid extraction was more selective for sulphate sulphur than the more rigorous HCI extractions.

96lOOO59 In-situ polymerization of pyrrola in coal Patil, A. 0. and Kelemen, S. R. Polym. Mater. Sci. Eng., 1995, 72, 298-299.

96lOOO66 Method for simultaneous use of a slngla additlve for coal flotation. dewatarina. and raconstltutlon Wen, W. W. et al.,. (Assigned t;j United States Dept. of Energy, US Pat. US.5.379.902. Jan. 1995. A single dose of additive contribution to three consecutive tine coal unit operations, i.e. flotation, dewatering and reconstitution, whereby the fine coal is first combined with water in a predetermined proportion to formu- late a slurry. The slurry is mixed with a heavy hydrocarbon-based emulsion in a second predetermined proportion and at a first predetermined mixing speed and for a predetermined period of time. The slurry is then cleaned by a froth flotation process to form a clean coal froth and the froth is then dewatered by vacuum filtration or a centrifugation process to form recon- stituted products.

96/0006? Method of and apparatus for enriching and desul- furizlng fine coals Blaszczynski, S. (Assigned to) Politechnika Slaska, POL. PL.I62,697. Describes a method and apparatus for desulphurization and beneficiation of fine coals.

96lOOO66 Method of coal flotation using ollgomeric poly isobutylana collector Petukhov, V. N. et al., Russ. Pat. RU.2,019,302, Sep. 1994.

The paper describes the formation of a coal-FeC$ complex and its use to polymerize pyrrole with resultant electric conductmg coal.

96lOOO6O Investlgations of coal purification by selective oil agglomeration Skarvelakis, C. et al., Sep. Sci. Technol., 1995, 30, (12), 2519-2538. Describes how selective oil agglomeration is used as a physical method to reduce impurities in coal fines. The efficiency of the process depends on many factors. The effects of many operating variables have been examined for different coals and tailings, and the efficiency of the process in coal cleaning has been demonstrated. Summarizes the work carried out in order to develop coal oil agglomeration as a technique for clean coal-water-fuel slurry production.

96lOOO69 Microbial desulfurlzation of coal and oxidation of pure pyrite by Thiobacillus ferrooxidans and Acidianus brlerleyl Olsson, G. et al., J. Ind. Microbial.! 1995, 14, (5), 420-423. Discusses how Thiobacillus ferrooxldans and Acidianus brierleyi were capable of oxidizing pure pyrite as well as oxidizing sulphur in coal. First order reactions were assumed in the kinetic analysis performed. For oxida- tion of pure pyrite the rate constant was higher for A. brierleyi than for T.ferrooxidans.

96/00070 Microbial removal of organic sulfur from coal Zhong, H. et al., Chinese)

Weishengwu Xuebao, 1995, 35, (2), 130-135. (In

96lOOO71 Microwave oretreatment of coal orlor to maanatlc 96lOOO61 Laboratory baffled-column flotation of mixed lower-middle Kittannina seam bituminous coal Kawatra, S. K. and Eisele,-T. C. Miner. Metall. Process., 1995, 12, (2), 103-107. Discusses how the separating efficiency of a flotation column is largely limited by the degree of backmixing of tailings into the froth zone, and how the recoverv is limited bv the decree of short-circuitine of feed to the tailings. Currenicolumns are iypicallyconstructed very tallip to about 30- 40 ft, to limit the effects of backmixing and short-circuiting. These effects can also be reduced in a much shorter column, provided that the flow in the column approaches the performance o P

lugflow. It was found that horizontal baffles improved a 6-ft laboratory-scale flotation column treating a

poorly floatable coal. Test with variations in the baffle ositions showed that baffles are needed both above and below the feed P in et to achieve the greatest benefit.

separation Butcher, D.A. and Rowson, N. A. Magn. Electr. Sep., 1995,6, (2), 87-97. The paper describes how a significant increase in the remov&of total sulphur from coal is observed when microwave pretreatment was applied lo prior to magnetic separation.

96lOOO72 Modeling the biologlcal solubilizatlon of coal in a liquid fluidizad-bed reactor _ Wana. Y. et al.. AUDI. Biochem. Biotechnol., 1995. 51. 437-448. A fury viour o P.

redictive maihematical model was developed to describe the beha- hquid fluidized beds in which biological solubilization of coal

particles occurs. The model was based on the particle mass-transport mech- anisms of dispersion and convection, and accounts for the changes in the size of the particles as they are solubilized. Two different cases were corn- pared: one in which the bed is replenished with large coal particles and one m which small particles are fed to the bed.

96100062 Manufacture of formed coke by carbonization of coal briquets Watakabe, S. et al., (Assigned to) Kawasaki Steel Co., JAP. Pat. JP.O7,53,964, Feb. 1995. The process of manufacture is carried out by adding binder into coal blends mainly containing non-caking coal, and then pressing to form briquets.

96100073 The National Museum of Coal Mlnlng McCollum, S. Coal, Sep. 1995, 100, (9), 102-104. The author describes the National Museum of Coal Mining in Golf, Ill., USA.

Fuel and Energy Abstracts January 1996 5