A dry milling process for the production of ground mica

Abstract The Mineral Research Centre of the Quebec Department of Energy and Resources has worked extensively on the development of a dry process to extract pure mica flakes from a phlogopite ore. The liberation of mica from the gangue is effected basically by impact crushing, and the ground ore is screened into several fractions, each having a fairly narrow range of grain size. Each sized fraction is then fed to an air separator where heavy grains are separated from light flaky grains. Heavy fractions are returned to hammer mills where gangue minerals are ground finer and blacky mica particles are exfoliated. A second stage of screening is performed and each fraction is sent to an air separator. This sequence is repeated until mica products are virtually free of gangue. These different fractions are then treated in a cage mill in which mica flakes undergo a more orderly exfoliation along cleavage planes. The ground mica is again submitted to a final screening stage, after which each fraction constitutes a final commercial product.This process permits the recovery of about 70% of the mica contained in the ore. The over-all process will be described along with technical details of each unit operation. Recent work on a wet grinding method to produce very fine mica will also be discussed.
Keywords: Industrial minerals, Mica, Milling, Dry milling, Quebec, Suzor deposit, Suzorite, Crushing, Screening, Separation, Delamination. Grinding.
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Summary: This paper discusses the benefits of industrial minerals, their sources of supply, price and marketing trends, and their increasing use as substitute materials and "strategic" minerals.
Publication: CIM Bulletin
Author(s): PETER HARBEN
Keywords: Industrial minerals, Barite, Calcium carbonate, Graphite, Magnedte, Talc, Asbestos, Potash, Phosphate, Borates, Bentonite, Kaolin.
Issue: 842
Volume: 75
Year: 1982
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Summary: This paper presents the results of an analytical study to assist in the design of blast furnace tuyeres, including a prediction of the heat transfer process.
Publication: CIM Bulletin
Author(s): M. DOSTIE, Y. MERCADIER
Keywords: Castings, Copper castings, Iron, Steel, Heat transfer, Blast furnaces, Tuyeres, Numerical simulation.
Issue: 842
Volume: 75
Year: 1982
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Summary: This paper discusses the experience of Noranda Mines Limited, Matagami Division, with the vertical crater retreat (VCR) method in the mining of narrow-vein stapes. Although limited to only one slope, the viability of this method at the Radiore No. 2 Mine has proven that further use of VCR in narrow-vein mining will be made.
Publication: CIM Bulletin
Author(s): AL GOODIER
Keywords: Underground mining, Vein mining, Narrow veins, Vertical crater retreat mining, Radiore mine, Sloping, Drilling, Blasting.
Issue: 842
Volume: 75
Year: 1982
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Summary: Environmental problems encountered with the use of diesel equipment in underground mining operations are discussed. The concept and procedure of implementing the Health Effects Index equation as a means of quantitatively assessing an underground working environment is outlined and sample calculations are presented. Advantages and disadvantages of utilizing this method are also discussed.
Publication: CIM Bulletin
Author(s): ANTONIO FONTANA
Keywords: Underground mining, Health Effects Index, Ventilation, Diesel exhaust, Combustion, Sampling, Environmental control.
Issue: 842
Volume: 75
Year: 1982
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Summary: This paper will initially outline the specific types of copper castings used in blast furnace iron production. Tuyeres, tuyere coolers and stack cooling plates will be discussed in some depth, with particular reference to their dimensional configuration and purpose.Following this, the failure of such cooling members will be discussed, with .special focus on tuyeres. Tuyeres are the most common casting which often requires replacement. Reasons for failure and its effect on operations will also...
Publication: CIM Bulletin
Author(s): J.B. HYDE, G. THOM, A. KAY
Keywords: Castings, Copper castings, Iron, Steel, Cooling plates, Blast furnaces, Stack plates, Bosh plates, Baffles.
Issue: 842
Volume: 75
Year: 1982
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Summary: Plastic Filled Valley (PFV) wire rope represents a significant development over the design of conventional wire rope. A sealing thermoplastic is impregnated under controlled conditions of temperature and pressure into a conventional lubricated wire rope to produce a lattice of plastic which surrounds and separates the strands from each other and from the core. Metal-to-metal contact is thereby alleviated and the lubricant is sealed in. The wear resistance, rope breaking load, fatigue...
Publication: CIM Bulletin
Author(s): S. WOOD
Keywords: Equipment, Maintenance, Rope, Wire rope, Fatigue, Abrasion, Corrosion.
Issue: 842
Volume: 75
Year: 1982
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Summary: A study of the techniques to integrally cast copper tubes in copper tuyeres for use in blast furnaces has been carried out. The work has been performed in support of current efforts to produce two-compartment tuyeres having improved water-cooling capacity. A test pattern corresponding to a vertical section of a two-compartment tuyere, and including a cast-in-place copper tube, was used to investigate such variables as tube preparation, tube coolant, pouring temperature, pouring rate and...
Publication: CIM Bulletin
Author(s): J.L. DION
Keywords: Castings, Copper castings, Iron, Steel, Tuyeres, Tubes, Gating systems, Coolants, Bonding, Blast Furnaces.
Issue: 842
Volume: 75
Year: 1982
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Summary: Throughout the history of mining at the Dome, gold has been found in a number of different rock types and in association with a number of different structural settings. Diamond drilling plays an important role in the evaluation of the strati-graphic and structural features which control ore deposition. The main function of diamond drilling is to locate favourable areas of mineralization.To date, over 20,000 diamond drill holes have been drilled from combined surface and underground programs....
Publication: CIM Bulletin
Author(s): D.S. ROGERS
Keywords: Geology, Ore deposits Diamond drilling, Ore definition, Dome Mine, Gold deposits, Stratigraphy, Structure, Vein structure.
Issue: 842
Volume: 75
Year: 1982
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Summary: Several recent cases indicate that the Courts may be leaning toward a more favourable treatment of mine closing and related costs. In this article, we look at two recent cases, Burnco Industries Ltd. and Nomad Sand & Gravel Ltd. The former was heard before the Federal Court - Trial Division and the latter before the Tax Review Board.It appears that in certain situations mining companies may now be able to sustain current deductibility of estimated mine closing costs during the productive...
Publication: CIM Bulletin
Author(s): ROBERT B. PARSONS
Issue: 842
Volume: 75
Year: 1982
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Summary: This paper compares several distinct types of mineral deposits associated with different families of granitoid rocks in the New Brunswick Appalachians. Porphyry copper deposits are assodated with late-stage differentiates of Lower to Middle Devonian I-type igneous complexes. Contact metasomatic deposits were formed where these plutons intrude carbonate rocks and they gave rise to vein deposits in fracture zones near wrench faults. The I-type granitoids were emplaced mainly in areas of thin...
Publication: CIM Bulletin
Author(s): A.A. RUITENBERG, LR. FYFFE
Keywords: Geology, Ore deposits, Intrusions, Granitoid intrusions, Subvolcanic stocks, Tectonics, Appalachians, Porphyry copper deposits, Contact metasomatic deposits, Vein deposits, Copper, Nickel, Tin, Tungsten, Molybdenum, Antimo, Exploration, Petrochemistry, Pokiok Batholith, Burnt Hill Intrusion, St. George Batholith, Variation diagrams.
Issue: 842
Volume: 75
Year: 1982
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