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The Effect of Dense Medium Viscosity on Separation Efficiency
Coal Preparation, 1990This paper reviews the literature on the influence of viscosity on separation in dense medium processes, for both baths and cyclones, in the context of the well-known fundamentals of particle motion in fluids. It is concluded that viscosity does play a role in determining both the separation density and the extent of separation inefficiency (Ep ...
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Analysis of a dense-medium separator for coarse coal separation using computational fluid dynamics
Mining, Metallurgy & Exploration, 2007The raw-coal feeding system and the upward medium current flow in a dense-medium vessel (DMV) are, in addition to the residence time of particles in the separator, important factors for efficient coarse particle separation. The feed material from a raw coal screen and/or pre-wet screen merge with the major volume of circulating medium as push medium ...
F. F. Peng, Y. K. Xia
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The Influence of Near-Dense Material on the Separation Efficiency of Dense-Medium Processes
International Journal of Coal Preparation and Utilization, 2008Near-dense (also termed near-gravity) material is material that has a relative density that is close to that of the separating liquid or dense medium used to separate coal and the impurities contained in raw coal. Near-dense material makes the separation more difficult because it settles very slowly in the dense-medium due to the fact that its density ...
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Modelling and simulating dense medium separation processes — A progress report
Minerals Engineering, 1991Abstract There is an extensive literature on the performance of dense medium separation (DMS) processes in both coal (low density) and mineral (high density) applications. However, very few workers have grappled successfully with the problem of developing effective mathematical models of DMS processes for simulation, other than the trivial option of ...
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Medium circuit design and control for multi-density dense medium separation plants
1994The paper describes the new design criteria and control strategies for multi-density dense medium separation (DMS) circuits. The role of the multi-density separation is discussed, and it is emphasized that for many processing problems -related to minerals and coals -it may be very important to perform two or more cuts at different densities in order to
G. Ferrara +2 more
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Construction of Medium-Sized Rings by Gold Catalysis
Chemical Reviews, 2021Ronald L Reyes +2 more
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Large metallicity variations in the Galactic interstellar medium
Nature, 2021Annalisa De Cia +2 more
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