The post-failure characteristics of rock

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Mots clés : Failure;Friction;Coal;Rock mechanics
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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: Potassium is one of the three basic plant nutrients along with nitrogen and phosphorus. There is no substitute for potassium compounds in agriculture; they are essential to maintain and expand food production.
Potash is extracted from buried ancient evaporites by underground or solution mining. This accounts for most of the potassium produced. Another important source is brine from land-locked water bodies, such as the Dead Sea, Salar de Atacama or Great Salt Lake. About 95% of potash...
Publication: CIM Bulletin
Auteur(s): C.F. Perucca
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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