Contact-angle measurements on coal particles from solidification-front experiments

Abstract The determination of surface tensions and contact angles of coal particles is of great interest for coal beneficiation processes such as froth flotation and oil agglomeration and for the inclusion of coal particles into oil droplets as a means of enriching the fuel.Methods for contact-angle measurements on small irregularly shaped solid particles have not been available in the past. Therefore, we recently developed a novel technique to determine contact angles and surf ace tensions of coal particles. Two types of bituminous and one type of subbituminous coal particles have been tested. The technique used is called the freezing-front technique and it considers the behaviour of the test particles (in the range of 20-250 pm) at the solidification front of carefully selected, well-defined solidifying melts (matrix materials) such as thymol, biphenyl, naphthalene, salol and 2-phenyl phenol.The results show that the technique works well, providing quantitative and detailed information on the wettability of coal particles. The sensitivity of the method is so high that a difference in contact angle of approximately 4 degrees between the smaller and the larger particles is clearly registered.
Keywords: Coal processing, Contact-angle measurements, Solidification front, Surface tensions, Froth flotation, Oil agglomeration, Freezing-front technique.
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Summary: This review paper is intended to provide, the mineral process engineer with an introduction to the concepts, terminology and practice of mineral process control. It also provides an extensive sampling of the vast body of literature relevant to this topic. The topics discussed include the principles of automatic control, instrumentation, mineral processing unit operations, process modeling and simulation, and process and plant control.
Publication: CIM Bulletin
Author(s): A. GALIP ULSOY, K.V.S. SASTRY
Keywords: Mineral processing, Control systems, Automatic control, Instrumentation, Process modelling, Simulation, Computers, Grinding, Flotation, Pelletizing, Buick Mine, Mount Isa Mines Ltd.
Issue: 836
Volume: 74
Year: 1981
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Publication: CIM Bulletin
Author(s): D.H. WILSON
Keywords: Education, Engineering, Mine Plant engineering, Plant engineering, Mechanical, Electrical, Manpower.
Issue: 836
Volume: 74
Year: 1981
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Publication: CIM Bulletin
Author(s): ROBERT B. PARSONS
Issue: 836
Volume: 74
Year: 1981
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Summary: The base metal mine at Buchans, Newfoundland, has been producing since 1928. For many years, mill tailings were disposed of by dumping into a nearby natural watercourse via which they were transported to Red Indian Lake and deposited. In 1965, environmental concerns prompted the establishment of settling ponds near the mine site. Effluents fed to these ponds included slimes washed from mine backfill sand and waste water pumped from underground as well as mill tailings. Dusting around the...
Publication: CIM Bulletin
Author(s): PAUL J. O'BRIEN, GEORGE N. NEARY
Keywords: Environmental control, Vegetation, Reclamation, Tailings, Buchans Mine, Pollution control, Dusting, Stabilization, Grasses, Air monitoring.
Issue: 836
Volume: 74
Year: 1981
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Summary: Nuclear energy is an established and proven energy source. Today, CANDU-PHW nuclear-electric generating stations produce over one third of Ontario's total electrical supply: safely and economically. In many parts of Canada, where economic hydro resources do not exist or are fully developed, coal and nuclear energy are the only alternatives for future large-scale electrical generating capacity.Recent analyses have suggested that, in the face of increasing energy demands and decreasing reserves...
Publication: CIM Bulletin
Author(s): J. BOULTON
Keywords: Energy resources, Nuclear energy, Generating stations, Electricity, Reactor safety, Radioactive waste management, CANDU reactor, Environmental control.
Issue: 836
Volume: 74
Year: 1981
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Summary: Les Services TMG (Niobec) currently treat a niobium ore in the Chicoutimi area of Quebec. The mineral pyrochlore is present in a carbonatite deposit which assays 5% to 7% apatite.The ore is ground to minus 65 mesh and deslimed at 10 micrometres. Part of the carbonates are floated with a fatty acid emulsion and rejected to the tailings as a first step to ensure the proper conditions for the flotation of the pyrochlore concentrate. The carbonate concentrate is 65% minus 44 micrometres and is...
Publication: CIM Bulletin
Author(s): GENNARD DELISLE
Keywords: Industrial minerals, Apatite, Carbonatite, Pyrochlore ore, Flotation, Reagents, Niobec mine.
Issue: 836
Volume: 74
Year: 1981
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Summary: In the past two to three years, all continuous mining machines at the Potash Corporation of Saskatchewan Mining Limited, Lanigan Division, have been changed over to a new cutting pattern using 1-inch- and 1-3/16-inch-diameter self-sharpening pencil bits. The bits are arranged in a cone-type pattern across the face on 2'A-inch and 3-inch spacing. The result is that the ore is removed by chipping and flaking. Previously, rap-lock bits were used, with the pattern being several bits in single...
Publication: CIM Bulletin
Author(s): ERIC BEST
Keywords: Industrial minerals, Potash, Underground mining, Continuous miners, Bits, Pencil bits, Lanigan mine.
Issue: 836
Volume: 74
Year: 1981
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Summary: Computers have been used extensively in the mineral industry in exploration, reserves calculation, mining technology, mineral processing, etc. With respect to coal mining, there are also various applications for evaluating rock slope stability of open pits, design of open pits, underground operations, mine ventilation, ground control, data processing and management information, operations control and certain technological applications. Mine ventilation appears to be the field in underground...
Publication: CIM Bulletin
Author(s): B. DAS
Keywords: Computers, Process control, Underground mining, Coal mining, Mining methods, Simulation, Mine planning, Longwall mining.
Issue: 836
Volume: 74
Year: 1981
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Summary: Carbonate-rich rocks occur at several localities within the Flin Flon volcanic sequence of the eastern Amisk Lake area. The rocks occur in two areas: as a group of small occurrences on islands within Amisk Lake and as two much larger linear belts running parallel to the regional structure east of Amisk Lake. Mineralogically, the rocks consist of talc and Ca-poor ankerite with occasional graphite. Segregation of these minerals and colour variation impart a well-defined planar fabric to the...
Publication: CIM Bulletin
Author(s): G.R. PARSLOW, B.R. WAITERS, F.H. McDOUGALL
Keywords: Geology, Geochemistry, Carbonate rocks, Amisk Lake area, Volcanic rocks, Flin Flon sequence, Mineralogy.
Issue: 836
Volume: 74
Year: 1981
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