Structural Considerations Affecting Selection of Major Components In Grinding Mill Design

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Texte
Sommaire: Special considerations are described as they apply to the design of ring gears for high-power grinding mills. AGMA requirements, the importance of the supporting structure, material selection and related field experience are discussed, with special emphasis on available and developing manufacturing technologies.
Publication: CIM Bulletin
Auteur(s): Robert M. Vadas
Mots clés: Gears, Ring gears, Grinding mills, Foundry technology, Milling, Material strength.
Numéro: 799
Volume: 71
Année: 1978
Texte
Sommaire: Thermal energy storage offers a means of effecting significant costs savings and conservation of premium fuels. Na2SO4 has been found to be a good material for storing thermal energy in the medium-temperature range, mainly because of its dimorphic nature and high heat of transition. Basic data and development of the salt to a practically usable block are discussed.
Publication: CIM Bulletin
Auteur(s): Arun Verma
Mots clés: Industrial minerals, Heat storage, Sodium sulphate, Thermal energy, Conservation, Eutectic binders.
Numéro: 799
Volume: 71
Année: 1978
Texte
Sommaire: With over 700 large electric-drive haulage trucks operating in Canadian mining today and over 3700 in mines worldwide, most aspects of electric drive are well known. Recently, however, extensive application of these trucks to down-hill hauling in mountain mining makes it vitally important that many of us better understand the operation and proper application of the dynamic retarding feature of these vehicles. This paper is an attempt to clear up misunderstandings on this subject, to suggest...
Publication: CIM Bulletin
Auteur(s): Barry J. Turley
Mots clés: Mechanical-electrical, Retarding systems, Electric drives, Haulage trucks, Braking, Trucks, Open-pit mining.
Numéro: 799
Volume: 71
Année: 1978
Texte
Sommaire: This paper points out two key elements in resource trade in general and the Canada-Japan relationship in particular. The first is that the advanced countries have a more important role than one would expect in the supply of resources in world trade. Canada's dual role as a major resource supplier in conjunction with an advanced economy will continue to increase. The second point is the heavy reliance on foreign resource supplies in some advanced economies, particularly in Japan. Finally, as...
Publication: CIM Bulletin
Auteur(s): T. Iwasaki
Mots clés: Mineral economics, Trade, Resource trade, Japan, Markets, Energy, Economy.
Numéro: 799
Volume: 71
Année: 1978
Texte
Sommaire: In his April 10, 1978 budget address, Finance Minister Chretien declared that the federal government will restrict the growth of its spending to less than the trend growth of the gross national product; over the past year, both the federal and a number of provincial governments have taken action to cut back on spending policies.This new emphasis in restraint would seem to be a response to a mounting public reaction to the rapid growth of government spending — and taxation — over...
Publication: CIM Bulletin
Auteur(s): R. D. Brown
Numéro: 799
Volume: 71
Année: 1978
Texte
Sommaire: This paper deals with the prediction of locked cycle flotation results from data developed from individual batch tests. A postulate is made that the distribution of material in a separation stage is determined by the chemical conditions and the flotation time and that this distribution can be characterized by split factors which are constants for a fixed set of conditions. With this premise, it is demonstrated that a steady-state balance can be calculated for a circuit.Although the necessary...
Publication: CIM Bulletin
Auteur(s): G.E. Agar, W.B. Kipkie
Mots clés: Mineral processing, Flotation, Locked-cycle flotation, Simulation, Computer programs, Separation, Talcose ore, Silver concentration, Pipe ore, Copper, Nickel.
Numéro: 799
Volume: 71
Année: 1978
Texte
Sommaire: The design of the long-hole sublevel mining method was originally based on the traditional assumption that the principal load was due to the weight of the overlying rock, and that the horizontal stresses are equal to one-third of the vertical stress. However, as mining progressed, the virgin lateral stress was found to be equal to or greater than the vertical stress.The virgin stress in the rock mass is not uniform throughout the folded orebody and adjacent strata. From detailed investigation...
Publication: CIM Bulletin
Auteur(s): M. L. Jeremic
Mots clés: Rock mechanics, Stress mechanisms, Mindola Mine, Zambia, Longhole mining, Sloping, Caving, Pillars, Backfilling.
Numéro: 799
Volume: 71
Année: 1978
Texte
Sommaire: The thermodynamics of the reactions taking place are examined with the aid of equilibrium diagrams for the Pb-O-S system. Based on investigations of chemical, mineralogical and differential-thermo analyses of intermediate products of different desulphuration degrees, an attempt is made to explain the mechanisms of the reactions in the smelting shaft of the KIVCET furnace. The differences between this and other direct lead smelting processes are demonstrated by these thermodynamic and kinetic...
Publication: CIM Bulletin
Auteur(s): K.B. Chaudhuri, G. Melcher
Mots clés: Pyrometallurgy, Smelting processes, Direct reduction, Environmental control.
Numéro: 799
Volume: 71
Année: 1978
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