Denver cell

Table 1 Denver cell flotation testing of sample A soft kaolin with good flotation response)...

These machines provide mechanical agitation and aeration by means of a rotation impeller on an upright shaft. In addition, the Agitair and Denver cells also utilize air from a blower to help aerate the pulp. 

Sawant et al. (1980, 1981) also used White and de Vilhers empirical approach and correlated their data for Denver and Wemco cells, respectively. Their correlation for Denver cell was expficit in terms of unlike that of White and de ViUiers. The correlations obtained were... 

In the experimental part of Zundelevich s work, an optimized impeller systan as per Sokolov and Zinger was compared with another having diverse proportions. The impeller configurations used were similar to that of a Denver cell. A comparison of the performances discussed later confirms the superiority of the optintized impeller... 

Lima et al. (2009) investigated solid suspension in laboratory-scale Wemco and Denver cells and compared their results with those of van der Westhuizen and Deglon (2008). These investigators could also correlate using Zwietering-type correlation (Eq. 9.49). Expectedly, the parameters andp, which are dependent on the type and size of the impeller/cell design, were different for the three types of cells. 

Table I Some physical properties of the coal and the Denver cell flotation test conditions.

The mechanical cells that are most widely used today in sulfide, coal, and nonmetaUic flotation operations in the western hemisphere are made by Fagergren (by WEMCO Division of Envirotech Corporation), D-R Denver (by Denver Equipment Corporation of Sala International), Agitair (supplied by Galligher Ash Company), and Outokumpy (by Outokumpu Oy). 

Figure 1.48. A Denver flotation cell for coal washing...

Y. Tabuchi, N. Kubo, in 6th International Fuel Cell Science, Engineering and Technology conference (2008), FuelCell2008-65201, DENVER, CO, 16-18 June 2008... 

The value of K lies in the range —0.9 to —1.3. For the liquid viscosity range 1 to 80 x 10-3 Pa S, Sawant and Joshi (1979) proposed the following relationship for the Denver and Wamco type of flotation cell ... 

Ganley J (2006), Intermediate temperature direct ammonia fuel cell , presentation at Ammonia Fuel III, Denver, CO. 

The Lord and Taylor Laboratory for Lung Biochemistry, Program in Cell Biology, Department of Medicine, The National Jewish Medical Research Center, Denver,... 

Hydrogen/Fuel Cells for Transportation/Fuels for Fuel Cells, DOE 2002 Annual Meeting, Denver Colorado, May 6-10, 2002. 

Rogers, W, Shekhawat, D., "Fuel Processing of Diesel for Fuel Cells", 2002 Fuel Cells for Transportation Program / Lab R D Review, Department of Energy Office of Transportation Technology, Denver, Colorado, May 6- 10, 2002. 

Bubble pickup-. A bubble is formed at the tip of a capillary tube and introduced into a stirred suspension of particles. Hydrophobic particles will adhere to the bubble. Under standardized conditions, the amount of material collected on the bubble(s) can be compared with other suspensions. Microflotation-. Any small-scale flotation cell device can be used to contact a suspension with rising air bubbles onto which hydrophobic particles will become attached. The particle-laden froth that is produced either flows to a collection tube (as in HaUimond or similar type flotation tubes) or can be drawn off into a separate collection vessel (as in small-scale Denver, levitation device or similar type flotation cells). This is also referred to as a levitation technique. 

The leach test residues were subjected to fioth flotation. The solids were repulped in a blend of leach solution and water to achieve a solids content in the slurry of approximately 8 to 10% solids, and were subjected to flotation in a Denver Model D-12 laboratory flotation machine. The slurry was mixed in the cell for 2 minutes prior to introduction of air, with the agitation rate at 1 500 rev/min in both the mixing and flotation steps of the operation. 

Sawant SB, Joshi JB, Pangarkar VG, Mhaskar RD. (1981) Mass transfer and hydrodynamic characteristics of the Denver type of flotation cells. Chem. Eng. J., 21 11-19. 

Recknagle, K.P., Ryan, E.M., and Khaleel, M.A. (2011) Numerical modeling of the distributed electrochemistry and performance of solid oxide fuel cells, presented at the ASME 2011 International Mechanical Engineering Congress and Exposition, Denver, CO, 11-17 November 2011. 

Sole, J.D. and Ellis, M.W. (2008) Determination of the relationship between capillary pressure and saturation in PEMFC gas diffusion media. Proceedings of Fuel Cell 2008, the Sixth International Conference on Fuel Cell Science, Engineering and Technology, Denver, CO. 

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