Performance improvements in industrial rod milling operations

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Publication: CIM Bulletin
Auteur(s): Douglas McDonald, Richard Poulin
Mots clés: Gainsharing plans, Human resources.
Numéro: 988
Volume: 88
Année: 1995
Texte
Sommaire: Finance Minister Paul Martin's second budget might be good for Canada's mining industry in the long run, but the budget raises a number of concerns for the industry in the near term. The budget papers suggest that the 25% resource allowance is not working as intended, and report that the Department of Finance will be reviewing this valuable allowance. The so-called "large corporations tax" rate will be increased. This annual tax, which is imposed on a corporation's capital even when...
Publication: CIM Bulletin
Auteur(s): Robert B. Parsons
Numéro: 988
Volume: 88
Année: 1995
Texte
Sommaire: The mining industry is taking advantage of the increased performance resulting from the use of variable speed AC drives for large motors. This technology provides increased efficiency under the variable speed and torque requirements of such drives as mine hoists, conveyors, and air moving equipment. The technology does introduce voltage spikes on the voltage wave form that stress the insulation system to a greater degree than would occur with a constant voltage source. These voltage spikes...
Publication: CIM Bulletin
Auteur(s): R.H. Rehder, M.E. Stutt
Mots clés: Equipment, AC drives, Mine hoists, Conveyors, Air moving equipment.
Numéro: 988
Volume: 88
Année: 1995
Texte
Sommaire: This paper presents the results of structural analyses and full-scale destructive tests conducted on liner plate culverts. The purpose of this work was to establish a design method and evaluate the suitability of using these structures in potential roof-fall areas for a rehabilitation application in lower stress and relaxed mining environments. Field evaluation of the design is currently in progress.
Theoretical ultimate resistance functions were established for two different culvert shapes...
Publication: CIM Bulletin
Auteur(s): Roy El. Durr, Glen R. Davidge
Mots clés: Rock mechanics, Underground mining, Structural analysis, Destructive testing.
Numéro: 988
Volume: 88
Année: 1995
Texte
Sommaire: The sillimanite group minerals, kyanite, sillimanite and andalusite are identified as alumina-silicate minerals with the common chemical composition Alf)3.SiO2, so that each possesses similar physical properties. Kyanite is the most abundant mineral and mainly occurs in Quebec, Ontario and British Columbia; sillimanite occurs in Ontario and Manitoba; and andalusite in Nova Scotia.
The main use for the sillimanite-group minerals is in refractory applications for the production of refractory...
Publication: CIM Bulletin
Auteur(s): P.R.A. Andrews
Mots clés: Industrial minerals, Silicates, Refractory silicate minerals, Kyanite.
Numéro: 988
Volume: 88
Année: 1995
Texte
Sommaire: As part of an over-all arsenic management strategy, Inco has developed a novel process that converts a by-product high moisture copper/arsenic sulphide precipitate into a crystalline copper arsenate suitable for the manufacture of wood preservation chemicals.
The copper/arsenic sulphide precipitate is atmospherically leached with oxygen and sulphuric acid, producing a crude (blue) copper arsenate precipitate, elemental sulphur, and a copper and nickel containing solution. The blue copper...
Publication: CIM Bulletin
Auteur(s): C.L. Stewart, J. Budac, D. Wrana, E. Krause, S.W. Laundry
Mots clés: Process development, Copper arsenate process, Arsenic management, Inco Manitoba Division.
Numéro: 988
Volume: 88
Année: 1995
Texte
Sommaire: A support system for large ground convergence conditions or burst-prone ground must contain holding elements (rockbolts, cable bolts, etc.) that are strong yet capable of sustaining large deformations, i.e., they must absorb as much energy as possible. Steel wire rope anchored in a borehole by a friction bolt provides these desired yield characteristics if the factional anchorage is placed deep enough into the rockmass, i.e., in non-yielding rock or beyond the expected depth of rock ejected...
Publication: CIM Bulletin
Auteur(s): D.D. Tannant, P.K. Kaiser
Mots clés: Rock mechanics, Frictional anchorages, Rockbursts, Swellex bolts, Cables, Wire ropes, Pull-out tests, Energy absorption.
Numéro: 988
Volume: 88
Année: 1995
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