Role of dispersants in the production of fine particle size calcium carbonate and kaolin slurries

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Mots clés : Calcium carbonate;Calcite;Dispersion;Dispersant;Polyacrylate;Stabilization
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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: 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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