Potash processing in Saskatchewan - A review of process technologies - Technical Note

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Sommaire: Aqueous slurries of fine particle size calcium carbonate are used in a diverse range of end-use products. In many cases, the end-use performance is governed by the fineness of the particle size distribution. In turn, the maximum fineness of the particle size distribution is primarily determined by the efficiency of the dispersants used during the production process. Here, we report the sodium polyacrylate mediated dispersion of calcite and kaolin. Firstly, we report a colloid chemical...
Publication: CIM Bulletin
Auteur(s): J.S. Phipps, D.R. Skuse
Mots clés: Calcium carbonate, Calcite, Dispersion, Dispersant, Polyacrylate, Stabilization, Fine particle size.
Numéro: 1070
Volume: 96
Année: 2003
Texte
Sommaire: A strain-softening constitutive relationship is introduced that describes the post-failure stress-strain curve for rock regardless of whether the rock is intact or broken. The core of this relationship is an “apparent friction” concept that relates the post-failure apparent cohesive and frictional characteristics of the rock to the strain. The relationship can be determined for a given rock via a series of tri-axial strength tests establishing the peak strength and corresponding strain for a...
Publication: CIM Bulletin
Auteur(s): T.G. Joseph, K. Barron
Mots clés: Failure, Friction, Coal, Rock mechanics, Stress-strain curve.
Numéro: 1070
Volume: 96
Année: 2003
Texte
Sommaire: Fires due to self-heating of coal have been a real problem since the beginning of mining. In order to minimize the harmful effect of fires caused by spontaneous combustion (sponcom), the tendency of coal for sponcom should be analyzed in detail. This paper presents the results of such research, which had two objectives: firstly, to determine the spontaneous combustion characteristics of lignites of all underground (u/g) mines of Turkish Coal Enterprises (TKÍ) in the laboratory; and secondly,...
Publication: CIM Bulletin
Auteur(s): T. Guyaguler, C. Karpuz, S. Bagci
Mots clés: Spontaneous combustion, Mine fires, Crossing-point temperature, Adiabatic oxidation, Turkish lignites.
Numéro: 1070
Volume: 96
Année: 2003
Texte
Sommaire: The St. Lawrence deposit is a large wollastonite skarn (ca. 9 Mt @ 41.3% wollastonite) adjoining the gabbroic-to-syenitic Leo Lake pluton in the granulite facies Frontenac Terrane of the Grenvillian Central Metasedimentary Belt. It occurs within a horseshoe-shaped horizon of quartzite, open to the east. The skarn extends over 1.2 km2, and comprises wollastonite-dominant, wollastonite-clinopyroxene, and diverse quartz-feldspar-sulphide
(-titanite) layers, interbanded with, and strongly folded...
Publication: CIM Bulletin
Auteur(s): T.A. Grammatikopoulos, A.H. Clark, B. Vasily
Mots clés: Skarn, St. Lawrence deposit, Beneficiation, Wollastonite, Industrial minerals.
Numéro: 1070
Volume: 96
Année: 2003
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