00015 Errors in coal and coke composition analysis as a result of irregular sampling

00015 Errors in coal and coke composition analysis as a result of irregular sampling

01 Solid fuels(sources,winning,properties) 96100010 Contents of trace elements In brown coal of Euroean and non-European fields. II. Other non-Europ...

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01

Solid fuels(sources,winning,properties)

96100010 Contents of trace elements In brown coal of Euroean and non-European fields. II. Other non-European basins. E art 3. Review Bouska, V. et al., Uhli-Rudy-Geol. Pruzkum., 1995, 2, (l), 12-19. (In Czech) Discusses the trace element distribution and abundance in brown coals.

01 SOLID FUELS Sources, Winning, Properties 96/00001 Application of computer chemistry to the study of coal chemical structure Murata, S. et al., Nippon Enerugi Gakkaishi, 1995, 74, (6), 342-351. (In Japanese) The paper discusses the application of computer chemistry to the study of coal chemical stritcture. Results of CAMD (computer-aided molecular design) studies concerning coal chemical structure are summarized. Describes the calculation of physical density of coal model molecules based on CAMD studies, by taking into consideration non-bonding interactions in coal molecules and interactions between coal organic materials and water in the model structure of brown coal. Calculation of properties of metamorphic coals 96100002 based on a structural-chemical model of organic mass Gagarin; S, G. et nl., Khim. Tverd. Topl. (Moscow), 1995, (3), 18-27. (In Russian) Based on the generalized model of the statistical structure unit of coal organic matter, an analysis of literature data on structure and roperties of various rank coals was carried out. An ootimal set of structura Pnarameters, describing distribution of C and H atoms in aromatic and aliphatic frag: ments of the structure of he heteroatoms (0, N, S) in organic matter was determined.

Karbo-Energochem. -Ekol., 1995, 40, (3), 70-76. (In Polish) The chemistry of transformation of disulfhydryl 96100004 iron to iron disulfide in natural systems (letter) Baruah, M. K. Fuel, Nov. 1995, 74, (ll), 1726-1727. 96lOOOO~ determination Xu, L. et al., Discusses the solid materials,

Coal

pore

fractal

structure

features

and

their

Meitan Zhuanhua, 1995, 18, (l), 31-38. (In Chinese) determination of the fractal structured features of porous especially of coal.

Coal self-heating and explosibility 96100006 Gouws, M. J. and Knoetze, T. P. J. 5. Afr. Inst. Min. Me&L, 1995, 95, (l), 37-43. Reports that the spontaneous combustion of coal and the explosion of coal dust are two phenomena that were identified by the South African mining industrv as reouirine investieation. The nroiect entailed tests on numerous coal samples in spet?ially de:gned appar%. Describes predictive indexes, based on routine laboratory tests, that were developed by the different research teams. 96100007 The coal-bearing, Cenozoic As Pontes 6::; influence on (northwestern Spain): Geological characteristics Cabrera. L. et al.. Int. J. Coal Geol.. 1995. 27. (2). 201-226. Lignite deposits on the Cenozoic As Pontes strikelslip basin were formed as a function of specific paleoclimate conditions and tectonic evolution of the basin. During the early evolutionary stages, the presence of active normal faults and thrusts inside the basin resulted in two subbasins with distinct differences in sedimentary recores, with respect to lignite seam occurrence, thickness, area1 extent and lithotype development.

96100011 Discovery and geological significance of andalusite in anthracite Chen, R. er al., Guilin Gongxueyuan Xuebao, 1995, 15, (l), 40-42. (In Chinese) On thermal contact metamorphism clay minerals in coal are changed into andalusite. Having examined the degree of crystallization of andalusite, it is believed that the anthracite is a low-grade thermal metamorphic rock. 96/00012 Effect of inertlnlte on porous texture of coals and coke produced from them Buchtele, J. and Straka, P. Karbo-Energochem.-Ekol., 1995, 40, (3), 76-80. (In Polish) Presents a study of 30 samples of coals from the Ostrava-Karvina Coal Basin and the cokes obtained from these coal samples. 96100013 Elastic behaviour of coals studied by mercury porosimetry Suuberg, E. M. er al., Fuel, Oct. 1995, 74, (lo), 1522-1530. Mercury porosimetry has been widely used to study the pore structures of coals. One of the difficulties in usine this aooroach for characterizinn oore size distributions involves the ‘c&rectid$ of the apparent int%ion volumes for coal compressibility. The paper presents results which use the mercury porosimetry technique to draw conclusions concerning the elastic roperties of coals. Both dry and moist coals and lignites are observed to g ave apparent compressibilities between about 2.6 and 8.5 GPa, typical of glassy solids. Electronic propertles of lodinated coals 96100014 Rus’yanova, N. D. er al., Khim. Tverd. Topl. (Moscow), 1995, (3), 14-17. (In Russian) The paper discusses EPR and diffuse reflection electronic spectra of iodinated coals. Also discusses the structure with conjugated bonds. 96100015 Errors in coal and coke composition analysis as a result of irregular sampling Legin-Kolar! M. Metalurgija (Sisak, Croatia), 1995, 34, (l), 47-51. (In Serbo-Croattan) Discusses the concentration of calcium, nickel, vanadium and iron in various particle size of samples. The results of these investigations show that chemical forms of elements (phase analysis) and their distribution in each particle fraction is of great importance, because, some chemical forms of a metal are not present in minimal sample particles, while the others are present in all sample particles equally. 96lOOOl6 Geochemical study of lshlkarl coals, Hokkaido, Japan Kimura, T. Shigen Kankyo Gijufsu Sogo Kenkyusho Hokoku, 1995, 15, 1-81. (In Japanese) The author reviews the various types of information about a coal seam’s depositional environment and diagenesis, obtained from its mineral and major inorganic elements compositions.

A set of’306 coal samples from different countries was used to establish a relationship between the specific energy and compositional parameters in terms of oxygen content and atmospheric ratios.

Importance of the reacting medium in artificial mat96/00017 uration of a coal by confined pyrolysis. 1. Hydrocarbons and polar compounds Mansuy, L. et al., Energy Fuels, 1995, 9, (4), 691-703. The reactivity of coal during confined pyrolysis strongly depends on the reacting medium and on the nature of the coexisting phases. Successive pyrolysis-extraction experiments with the selective removal of the generated fractions (gas + polars + hydrocarbons or gas and hydrocarbons only) allowed the behaviour of solid and solid + polar compounds during pyrolysis to be compared. Loss of aliphatic chains in the products and in the solid residue, extensive condensation of the solid residue, and condensation of polar compounds when they are preserved in the reacting medium clearly indicated that the absence of hydrocarbons in the reacting medium induces a deleterious effect on the solid residue and on the behaviour of the polar compounds. The results suggested that hydrocarbons play a major role as a solvating fluid that promotes hydrogen transfer reactions.

96100009 Computer model analyzes longwall drum bit wear Peng, S. S. and Luo, Y. Coal, Oct. 1995, 100, (lo), 58-60. Discusses observations of wear patterns of longwall shearer drum bits underground which indicates that bit wear is caused mainly by the rubbing action between the back part of the bit’s shank and coal face. Bit wear accelerates after the tungsten carbide tip begins to wear and reduces the bit’s clearance angle, resulting in more surface contact between the bit body and coal face.

Influence of temperature and mineral elements on 96100016 celulase activity and micromycete developments in samples of peat from the upper bog Semenov, A. M. er al., Mikrobiologiya, 1995, 64, (l), 97-103. (In -. Russian) Cellulase activity was determined and succession of micromycetes was followed in samples of peat from the upper bog. The effects of mineral supply and temperature was studied.

96lOOOO6 Comprehensive models for computation of the specific energy of coals $6:$: P. and Kakati, M. C. Chem. Eng. J. (Lausanne), 1995, 57, (3),

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Fuel and Energy Abstracts

January

1996