Processing fine fractions of low-rank coals

Abstract This paper is concerned with the problems inherent in the efficient and economical processing of the fine fractions of a coal from the Sulcis basin (Sardinia, Italy) whose characteristics are typical of low-rank coals occurring in the Mediterranean region. Three different techniques, based upon surface properties, are examined. Flotation can be very efficient from both a technical and economic point of view, provided care is taken in the modulation of the flotation pulp. Interesting results have been obtained with oil agglomeration and this method could be economically feasible. Finally, electrical separation has proven a viable technique, although it entails preliminary drying.
Besides discussing the problems encountered in the experimental research, some significant results of general validity are also given. They demonstrate that cleaned products can be obtained with fairly interesting recoveries, thus opening the way to advanced research aimed at setting up the most suitable technique for industrial application.
Keywords: Coal preparation, Beneficiation, Flotation, Low-rank coals, Coal processing, Oil agglomeration, Electrostatic separation, Sulas basin.
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Publication: CIM Bulletin
Author(s): LEROY G. HAGENBUCH
Keywords: Open-pit mining, Truck management, information system, Truck dispatch, Maintenance computers, Loading, Haulage, Downloading, Automated data gathering.
Issue: 892
Volume: 79
Year: 1986
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Summary: The planning and construction of prime coking coal beneficia-tion plants in the nationalized mines in India are reviewed. Flow schemes, construction practice, materials consumption, and costs are detailed. Medium-capacity beneficiation plants with multiple loops are recommended under Indian conditions.
Publication: CIM Bulletin
Author(s): D.D. BALI, S. CHATTOPADHYAY
Keywords: Coal preparation, Coal washeries, Coking coal, Beneficiation plants, India.
Issue: 892
Volume: 79
Year: 1986
Text
Summary: The advantages and disadvantages of a mobile crushing plant with a belt conveyor system compared to a stationary crushing plant with haulage by heavy trucks are described. The capital expenditure and operational expenses are compared and the individual cost factors are explained.
Every open-pit mine or quarry, however, is different and has to be assessed and analyzed individually in order to find the optimum and most economical solution. Due to the high truck haulage costs, many open-pit...
Publication: CIM Bulletin
Author(s): HEINZ ALTHOFF, R.D. CLARK
Keywords: Open-pit mining, In-pit crushing, Conveying, Belt conveyors, Truck haulage system, Capital expenditures, Costs
Issue: 892
Volume: 79
Year: 1986
Text
Summary: In recent years, an increasing number of mines in mountainous terrain have examined the possibility of placing mine waste rock into stream valleys. Pressure to utilize stream valleys as a primary location for waste disposal has increased at many of the mines currently under development or expansion. As the number of environmentally and economically ideal waste dumping sites is limited, consideration must be given to utilization of stream valleys. This raises concerns about maintaining water...
Publication: CIM Bulletin
Author(s): FREDERIC B. CLARIDGE, ROBERT S. NICHOLS, ALAN F. STEWART
Keywords: Geotechnical engineering, Coal mines, Waste dumps, Hydrogeology, Hydrology, Water quality, Environmental control, Slope stability.
Issue: 892
Volume: 79
Year: 1986
Text
Summary: A number of highwall failures have occurred in some of the Alberta coal strip mines of a type called by the authors "Multiple block plane shear slope failure"<'>. They cause rapid deterioration of the dragline bench, reduced productivity and maintenance costs.
The failures are invariably associated with the presence of almost horizontal (± 5 degrees) bentonitic clay bands in the overburden, often immediately above the coal seam, and regress behind the slope as a series...
Publication: CIM Bulletin
Author(s): K. BARRON, B. STIMPSON, K. KOSAR
Keywords: Slopes, Plane shear failure, Regressive failure, Coal strip mines, Rock mechanics, Open-pit mining.
Issue: 892
Volume: 79
Year: 1986
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