Computer predictions of coal cleaning performance

Abstract This paper discusses the application of the computer to coal preparation process predictions. In broad terms, the computer is used to perform two main functions. Firstly, the given float-sink analysis is interpolated and extrapolated to cover the entire actual range of raw coal specific gravity. Assumptions based on historical data must be made at times. Secondly, the partition curve, which, from historical data, defines the efficiency of a specific coal washing process, is applied to the washability data in order to determine the expected clean coal yield and quality. The vast amount of numerical work which is required to make a prediction of this type exhibits the need for computer methods in this area.
Keywords: Computers, Process control, Coal preparation, washing, Float-sink analysis, Ash data.
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Summary: The paper will cover the basic reasons for alkaline leaching, a brief description of the circuit and the reasons for the flowsheet used. Changes made to the flowsheet, including the use of mechanical agitation of pachuca slurry, the use of oxygen and its effect on extraction, the use of lime and its effect on process economy, and the environment, will be described. A brief description of a unique semi-autogenous mill and future circuit changes will be included.
Publication: CIM Bulletin
Author(s): D. H. BELL
Keywords: Hydrometallurgy, Uranium metallurgy, Leaching, Carbonate leaching, Alkaline leaching, Beaverlodge operation, Eldorado Nuclear Ltd., Grinding, Precipitation, Pachucas, Manpower.
Issue: 804
Volume: 72
Year: 1979
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Summary: U, Fe, Mn, Ni, Cu, Zn and Co data for the sediment in both Key and Seahorse lakes, which overlie portions of known economic uranium deposits in the region, are presented. With the exception of U, Fe and Mn, the elemental distributions can be considered anomalous, in a statistical sense, in both lakes. The U values are of particular interest in that Key Lake is not anomalous, whereas Seahorse Lake is markedly anomalous. Tentative correlations made with background data from other surveys in an...
Publication: CIM Bulletin
Author(s): G. R. PARSLOW
Keywords: Exploration techniques, Mineral exploration, Geochemical exploration, Key Lake, Seahorse Lake, Saskatchewan, Lake sediments, Waters, Uranium, Nickel, Zinc, Copper, Cobalt.
Issue: 804
Volume: 72
Year: 1979
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Summary: Denison Mines Limited has been processing uranium ore in the Elliot Lake area for the past 20 years. As the original concept of uranium processing has been modified somewhat over this period, the present paper will describe the current recovery practices at the Denison mill from crushing through concentrate drying and packing. Special emphasis will be placed on the leaching, ion exchange and precipitation sections of the process, with consideration being given to the entire circuit. Descripti...
Publication: CIM Bulletin
Author(s): E. LaROCQUE, E. PAKKALA
Keywords: Hydrometallurgy, Uranium metallurgy, Denison Mines Ltd., Leaching, Crushing, Grinding, Dewatering, Neutralization, Separation, Ion exchange, Precipitation.
Issue: 804
Volume: 72
Year: 1979
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Summary: A mathematical model for the performance of a vibrating screen is developed in terms of an oversize partition curve. This is a normalized curve for any assemblage of particles presented for screening when their size is normalized with respect to the 50 per cent passing size (d50 ) under the prevailing screening conditions. Based on the throughfall aperture (hT) of the wire mesh on the deck, the effects of oversize (% > hT), half-size under (%<0.5 hT), deck location and feed rate were...
Publication: CIM Bulletin
Author(s): V. K. KARRA
Keywords: Mineral engineering, Models, Screening, Vibrating screens, Partition curves, Sieve analysis, Metallurgy.
Issue: 804
Volume: 72
Year: 1979
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Summary: This paper will review the metallurgical aspects of the completed expansion program at Quirke, and the current rehabilitation and refurbishing program at Panel.During the Quirke program, completed at the end of 1977, the plant capacity was increased from a nominal 4,500 to 7,000 short tons per milling day. The expansion of crushing, grinding, neutral thickening and filtering, leaching, partial neutralization, sand-slime separation, sand washing, C.C.D., clarification, ion exchange, mine water...
Publication: CIM Bulletin
Author(s): K. D. HESTER
Keywords: Hydrometallurgy, Uranium metallurgy, Rio Algom Ltd., Quirke Mine, Panel Mine, Crushing, Grinding, Thickening, Filtering, Leaching, Cyclones, Countercurrent decant at ion, Ion exchange, Precipitation, Water treatment, Tailings neutralization, Clarification, LAMIX process.
Issue: 804
Volume: 72
Year: 1979
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Summary: Detailed regional geophysical and geochemical surveys, ground surveys and drilling were undertaken to follow-up the federal-provincial Uranium Reconnaissance Program (URP) over the 27,000-km2 Kasmere-Munroe area in northwestern Manitoba.An analysis of the URP data showed a fair correlation between the regional airborne radiometric results and lake-bottom geochemical results, both of which also correlated with the regional geology. More detailed surveys defined anomalies with greater precision...
Publication: CIM Bulletin
Author(s): N. M. SOONAWALA
Keywords: Exploration techniques, Mineral exploration, Uranium exploration, Manitoba, Geophysical exploration, Geochemical exploration, Kasmere-Munroe area, Leucogranites, Pelites.
Issue: 804
Volume: 72
Year: 1979
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Summary: Although uranium deposits in northern Saskatchewan are clustered around the Athabasca basin, basement lithostructure determines their distribution.Basal Wollaston Group pelites are invariably graphitic and carry uraninite in felsic segregations and biotitic pegmatite. Where these intersect the Athabasca Formation, remobilized uranium concentrated as pitchblende. Uranium is also concentrated in silicified and hematized sandstone where the Athabasca Formation overlies post-orogenic faults....
Publication: CIM Bulletin
Author(s): R. J. MUNDAY
Keywords: Exploration techniques, Mineral exploration, Uranium mineralization, Saskatchewan, Wollaston Group, Athabasca Formation, Pelites, Martin Formation, Pitchblende, Carswell Dome, Uranium City, Rabbit Lake, Raven, Horseshoe, West Bear, Collins Bay, Key Lake, Maurice Bay, Fond-du-Lac, Nisto, Midwest Lake, Dawn Lake, Cree lake, Duddridge Lake, Burbidge Lake.
Issue: 804
Volume: 72
Year: 1979
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Summary: A summary of geochemical dispersion processes is presented. Secondary and tertiary dispersion of uranium was examined at several uranium prospects in British Columbia.The vertical migration of uranium from bedrock (primary dispersion) through overburden into the various soil horizons, and into snow and plants, was studied, and relationships were sought to explain the dispersion patterns in the secondary and tertiary environments. Soil developments were examined to obtain information on...
Publication: CIM Bulletin
Author(s): JOHN J. BARAKSO
Keywords: Exploration techniques, Mineral exploration, Geochemical exploration, Uranium exploration, Overburden, Rexspar deposit, Tyee Lake deposit, Day Creek deposit, Neutron activation, Soils, Snow geochemistry, Plant geochemistry, Stream sediments, Lake sediments, Waters, Dispersion, Acid digestion, Leaching.
Issue: 804
Volume: 72
Year: 1979
Text
Summary: The need to apply the latest available technology to develop better tools and methods to meet problems in the mining industry was recognized by six of Canada's leading mining companies. As a result, MIROC (Mining Industry Research Organization of Canada) was chartered to identify problem areas in Canadian mining and to have research carried out to develop the tools and equipment to meet these perceived needs.The initial activity of MIROC has been in the environmental field, with improved...
Publication: CIM Bulletin
Author(s): PETER F. PULLEN
Keywords: Underground mining, MIROC, Equipment, Mine equipment, Clothing, Safety, Suits, Helmets, Lamps, Air packs, Batteries.
Issue: 804
Volume: 72
Year: 1979
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Summary: Blind boring of shafts is becoming an increasingly important part of shaft sinking. Blind-bored shafts have reached diameters of 25 ft in Europe and 16-1/2 ft in the United States. Much of the technology developed for blind boring has evolved from the technology of drilling wells for oil and gas production.Blind boring offers economic advantage in a number of situations where conventional shaft sinking either is extremely difficult or very expensive by virtue of large-capacity aquifers which...
Publication: CIM Bulletin
Author(s): JAMES H. COBBS
Keywords: Underground mining, Shaft sinking, Drilling, Blind drilling, Boring, Raise boring, Drill pipe, Stabilizers, Bits, Cutters, Circulation systems, Shaft linings.
Issue: 804
Volume: 72
Year: 1979
Text
Summary: Glacial lake sediments or glaciolacustrine deposits form a significant portion of the Canadian, Scandinavian and Russian landscapes. Furthermore, 50per cent of the Archean volcanic belts within the Canadian Shield area are covered wholly or in part by these deposits. Because of the high electrical conductivity and low hydraulic conductivity of these compact sediments, the application of geophysical (electrical) and geochemical techniques in such areas becomes a difficult task. The presence of...
Publication: CIM Bulletin
Author(s): B. W. SMEE, A. K. SINHA
Keywords: Exploration techniques, Mineral exploration, Geophysical exploration, Geochemical exploration, Overburden, Clay, Lake sediments, Glaciolacustrine deposits, Till sampling, Hydromorphic dispersion, Biogeochemistry, Soils, Precambrian Shield.
Issue: 804
Volume: 72
Year: 1979
Text
Summary: Uranium mines in Washington State include the producing Midnite and Sherwood mines and several mined-out deposits, the most productive of which was the Daybreak mine. The Midnite mine is generally classified as a hydrothermal deposit consisting of tabular orebodies in Precambrian pelitic and calcareous metasedimentary host rocks. The host rocks occur as roof pendants in a Cretaceous porphyritic quartz monzonite intrusive; the quartz monzonite averages 12 ppm U308. The uranium deposit appears...
Publication: CIM Bulletin
Author(s): P. CLINTON MILNE
Keywords: Exploration techniques, Mineral exploration, Uranium exploration, Washington State, Midnite mine, Sherwood mine, Daybreak mine, Okanogan Highlands, Cascade region.
Issue: 804
Volume: 72
Year: 1979
Text
Summary: Major-element data for unaltered, unmineralized felsic host rocks from a number of stratigraphically simple, massive volcanogenic Zn-Cu(-Pb) sulphide deposits of low metamor-phic grade have been compiled. The petrochemical affinities of these host rocks have been determined (by standard means and by discriminant analysis) and compared. This comparison indicates that volcanogenic deposits in felsic terrains are not restricted to the classical calc-alkaline rock association as previously...
Publication: CIM Bulletin
Author(s): J. S. FOX
Keywords: Exploration techniques, Mineral exploration, Geochemistry, Host rocks, Sulphide deposits, Volcanogenic sulphides, Base metals, Calc-alkaline rocks, Tholeiitic rocks, Discriminant analysis, Petrochemistry, Ore grade, Rhyelites, Quartz-porphyries, Pyroclastics.
Issue: 804
Volume: 72
Year: 1979
Text
Summary: A Bayesian decision model of minimum risk, based on the probability and costs of mine discoveries and non-economic projects, is presented for massive sulphide exploration in the Canadian Shield. The sample used for the model is composed of data relating to forty mines, sixty non-economic sulphide occurrences, and sixty occurrences of graphitic and pyritic material. These economic and barren samples consist of drilltested occurrences which were, in varying degree, characterized by conductivity...
Publication: CIM Bulletin
Author(s): G. FAVINI
Keywords: Exploration techniques, Mineral exploration, Sulphide deposits, Massive sulphides, Models, Decisional models, Bayesian models, Precambrian Shield, Discriminant analysis, Geostatistics.
Issue: 804
Volume: 72
Year: 1979
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