01 Solid fuels (preperetion)

%lOll% Dry tlnaa oxtraction at Gascoigns Wood Covacic. D. W. MInc ck Quarrv. Dec. 1994. 23. (12). 14-15. Discuss& the removal fine - material streams, without JI””

‘& fractions f&m @&&ly unseated feed c use of large volumes of water, ic. ‘dry fines

extraction’, which has been an on in problem for minerals processing engineers, partiallarly to those invo~e&n coal preparation. Many types of dg equipment have been used with varymg degrees of success but until the introduction of the IFE TRISGMAT screen, none have been totally succeaaful. Various methods have been considered by British Coal to achieve a reduction of the ash content and handleabilitv of fuel suwlied to the Power Generators. It was concluded that the rem&& of ‘dryr ‘&is from ex R.O.M. feed material would have a substantial effect on both aspects if the majority of the minus O.Smm fraction could be extracted. Des&es the b trials St Gas&~ Mine, UK

d to and the results achieved during evaluation

slcloy Ethct of cryogonlc addltlvss on grlndablllty of thsr-

BGm&Rz;d Narasimhan, K. S. Aufbcreit.-T&t., 1994, 35, (4),

Discus.& how hi& ash in coal has detrimental effect on grinding perform- ance and grindin coals revealed #I

media. A literature survey on comminution of different at chemical comminution will enhance the breakage

mechanism and improve the grinding performance.

%I01 IQ7 The ??fhct of ??olsctad addltlvoo and troatmonts on Qlesslor fluldlty In coalr Clemens, A. H. and Matheson, T. W. Fuel, Jan. 1995, 74, (l), 57-62. The modification of Gieselcr fluidiity development in coals by various pretreatments is examined and clarified. These pretreatments include the addition of solvent extracts, preheating and quenching, addition of radical stabilizers and blending. The effect of each treatment IS found to be depen-

to which it satisfies the re 1 uirements of the hydrogen

This inc udes changes in behaviour

effect preheatin has on the fluid explain, such as the very different

of the same coa . From a chemica P f. roperties of fresh and oxidized samples

found to behave predictably. viewpoint the components in blends are

%I01198 Effsct of solvsnt-to-coal ratlo on or anosulfur sxtractablllty In the parchlorcsthylsns organodrau R urlzatlon procsss Lee, T. Y. ef al., Fuel Sci. Technol. Int, 1994, 12, (7), 1019-1034. A novel reaction-extraction model for removal or organosulphur com- pounds from coal by extraction with perchloroethylene was proposed. The model treats the coal as a reactant to observe the effect of slurry corn si- tion on the rate of ‘lock-up’ reaction where the liberated p” organosu phur species from coal re-enters the coal organic matrix. A series of batch extraction was carried out to observe the effect of solvent-to-coal ratio on the extent of organosulphur removal. The kinetic parameters for orga- nosulphur ‘liberation’ and ‘lock-up’ reactions were simulated.

95lOll% coatln

Improvomont of coals for charging b drying and

7 bltumlnous coal products for provont on of dust r

format on Shiraishi~ K. et al, (Assigned to) Nippon Steel Corp., JAP. Par. JP.O6,184,543, JuL 1994. A process for drying coal charte for coke manufacture with a moisture content of 5% or more, adding tutuminous coal products (e.g. coal tar) 0.1. 10%. kneadinn for coatinn the coal charne with the bituminous coal orod- ucts to give p&icles, thencharging in Gke ovens. Resulting coals p&vent the formation of dust.

95/01200 Manufacturs of blndor-fras osllsts of low-rank coal Mainwaring, D. E. and Guy, D. W. Offen. DE.4,337,404, Aug. 1994.

. (Assigned to) Swinbume Ltd, GER

%I01 201 Ge, C.

Mathsmatlcal mod01 for mbdng coal Meitan Zhua&a, 1994, 17, (l), 94-97. (In Chinese)

Presents a mathematical model for mixing of coals. Describes the method by which a good coal can be replaced by mixing different coals wtih lower quality to meet certain industnal needs.

95lO1202 Modoa of occurrsncs of potsntlally haurdous ??lo- monts In coals: Lsvols of confldmcs Finkelman, R. B. Fuel Procem Technol., 1994, 39, (l), 21-34. The paper discusses the mode of occurrence end associations of potentially hazardous elements (i.e. pollutants) in coal. Because antimony and sele- nium may be present in solid solution in pyrite, as minute accessory sulphides dispersed throughout the organic matrix, or in organic associa- tion, it is anticipated that ~50% will be routinely removed by conventional coal cleaning procedures. On the other hand, physical coal cleaning should be successful in removing substantial amounts of arsenic and mercury, which occur primarily in late-stage coarse-grained pyrite.

%I01202 Moist caustic lwchlng of coal Nowak. M. A. (Assimed to) United Slates Devt. of Energy, US Pat. us.s,3i2,46~ Maj I@. .

_- -

The process IS for reducing the sulphur and ash content of coal.

%I01 204 Molten caustic Ieachlng at low caustic/coal ratloa Steffgen, F. W. et al., Prep?. Pap.-Am Chem Sot, Div. Fuel Chem., 1994, 39, (2), 421-428. The paper discusses molten caustic leaching desulphurixation of coals from three coal seams at low caustic-coal ratios.

%I01205 A new grlndlng procsss for dry Ilgnlts Mew&i, G. Aujbereit-Tech., 1994, 35, (4). 181-184. Describes a new process for a safe and economic grinding of predried lignite. In contrast to conventional grinding techniques for lignite, cooling precrushing, and screening of predried lignite can be avoided.

D5lOl205 Now msthod of paat dsgradatlon L&Lend Zhao, S. Ranliao Ifuaxue Xuebao, 1994, 22, (l), 108-111. (In

Under mild condition, Huachuan t degraded by using water-alcohol-Nr B”

from northeast of China was H solutions. Valuable products were

obtained. NMR and FITS analysis of ketone extract from de ded prod- ucts showed that it maintained some of the original structun feati of ff” the parent peat. thus and composition. DI erent from the conventional hydrolysis process, the I!

roviding information for the study of peat structure

degradatton products of the new method are mainly hymatomelanic and fulvic acid.

%I01207 Iar notworks

NMR lmaglng of hotsrogonoous coal macromolscu-

cod 7’

G. D. et al., Prepr. Pap.-Am. Chem. Sot., Div. Fuel Chem., 1994, 39. 11. 59-63. , . ,~ Discusses the NMR techniques .for imagin of heterogeyus coal macromolecular networks. Topics Lscussed mc ude solvent swellmg stud- f ies and solvent transport stubs.

%/012% An on-& svaluatlon of dltfersnt flotatlon tachnol- ogles for fins coal bsnoflclatlon Harris, M. C. et al., Miner. Eng., 1994, 7, (5), 699-714. Three flotation cell technologies were evaluated for the beneficiation of fine coal: a type cell, an B

ilot-scale conventional column cell, a pilot-scale Jamcson- an air-sparged hydmcyclone. The work was conducted on-

site at the Grootegeluk Colliery in the northern Transvaal province of South Africa. Also characterization and conventional batch flotation tests were conducted in the laboratory. All three units tested on-site demon- strated improved flotation.

selectivity compared to conventional subaeration

%I01209 1994 Prrsldontlal addross by Q.S. Jonos. Espsrsr dos Jours Mslllours Jones, G. S. Mine & Quarv, Nov. 1994, 23, (ll), ‘23-26. The Presidential address by G.S. Jones to the Minerals Engineering Society.

95/01210 Rsmoval of alkali mstals and/or slkallno sarth mst- als In coals by catlon rxchangs nslna Yamashita, T. et al., (Assigned lo) Idcmit3u Karan Co., JAP. Pat. 06,172,765, Jun. 1994. The process comprises the treatment of coals by contacting with cation exchange resins, preferably in water. The process is useful for the efficient removal of alkali metals and alkaline earth metels at room temperature, ambient pressure, and in neutral pH ranges.

95/01211 Role ot coal clsanlng In control of alr toxlcs Akers. D. and Dosoov. R. Fuel Process. Technol., 1994. 39. (1). 73-86. The paper discus& -;he impact of coal cleaning,- (espccieliy‘ ci&shin~ desulplmrization, and washing) on not only potential emissions but on downstream plant performance during combustion. Topics include faaors affecting trace element removal, impact of flowsheet design, removal of trace elements by advanced coal cleaning technology, boiler impacts, and waste disposal concerns. The degree to which a spr&ic trace e”,“;; g be reduced by coal cleaning de nds on the mode of occwlc trace element, the method of c caning used, and the way in which the p” cleaning process is operated.

%I01212 Solublllxatlon of bltumlnous and Ilgnlts coals by chrmlcally and blologlcally synthaslxod suffactants Polman, J. K et al., J. Chem TechnoL BiotechnoL, 1994,61, (l), 11-17. Tween 80, Triton X-100, and sodium_ dodecyl sulphate solubilixed se,veral components of Mississippi Wilcox wsl. The results suggested that solubl 4j!l$a$;~o~~~m~~;

by chemical- and biological-synthesixed surfactants has potential in terms of upgrading coals.

86 Fwl and Energy Abstracts March 1995