Mar 01, 1974 · **Decreased peripheral speed in 1 + 1 design probably due to increased blade area. 57 Air flow rate A scale-up criterion for similar flotation performance with machines of different size but the same design has been suggested {Harris and Lepetic, 1966; Arbiter et al., 1968; Arbiter and Harris, 1969; Harris and Raja, 1970) as constant flow number, NQ, where: NQ = Q/ND 3 ~. constant (3) Q is …
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Request an estimateNov 01, 2006 · Schubert (1986) has stated that maintaining a constant air flow number is only valid as a scale-up criterion if the cell volume is at least 30 dm 3. Evidence in support of this statement is the fact that the critical air flow number required to maintain suspension increases with cell size up to this volume (Schubert, 1986). It is suggested that this is because a fully developed turbulence spectrum, which is a …
Feb 08, 2019 · The air flow number in flotation machine scale-up. Int. J. Miner. Process., 3 (1976), pp. 257-280, 10.1016/0301-7516(76)90005-3. Google Scholar
However, in a flotation cell, the presence of air and the further necessity for balancing air and pulp flows to satisfy both flotation and suspension requirements simultaneously, introduces at least one other variable: air flow Qa; and at least one other dimensionless group the Air Flow Number Qa/ND³. This may also be expressed as Qa/A/ ND
Jun 22, 2015 · The pressure of air needed at the machine is from 1.6 to 1.7 lb. per square inch, which under normal conditions requires a pressure of about 2 lb. per square inch at the blower. It is usual to allow 75 to 100 cu. ft. of free air per minute at this pressure per foot of rougher and 45 to 70 cu. ft. per minute per foot of cleaner and recleaner
The variation of the hydrodynamic numbers such as the power number (N p), the Froude number (F r), the air flow number (N a), and so on, with volume scale-up, suggests good performance of the large-scale flotation cell. To decrease the detachment of the mineral particles in the large-scale flotation cell, a newly designed impeller, for which the impeller plate is a hyperbolic curve, namely an arc impeller, is developed
The Air Flow Number in Flotation Machine Scale-up. Article. Sep 1976; INT J MINER PROCESS ... The power number and air flow number were used to correlate the data.Flotation studies with a zinc ore
Sep 01, 1976 · The air flow number in flotation machine scale-up. Int. J. Miner. Process., 3: 257--280. The flotation cell is quantified as a mixing device for one, two, and three phase systems using combinations of water, air, and solids. To do this, power consumption was measured as a function of impeller speed, rate of aeration, and solids concentration
The variation of the performance parameters, such as the power number (Np), the Froude number (Fr), the air flow number (Na), and so on, with the flotation cell volumes, followed trends similar to
Scale-up methods for flotation cell design have been mainly Harris and Raja (1970) found that by scaling up from the labo- based on geometrical similitude and dimensional analysis with ratory to industrial cell performance, the flotation rate constant the use of dimensionless numbers (air flow number, power num- can decrease up to one order of magnitude. ber, specific power, etc.) in order to reach similar solid …
Jan 29, 2019 · It is easy to see that the air flow number and th e air capacity number only fluctuate slightly with scale-up in Figure 8. The air flow number is ~0.002, and the air capacity number i s ~15%
In the flotation column, countercurrent flow is . ... Dissolved Air Flotation Machine. ... TankCell e500 Development and Scale-up
Nov 04, 2013 · Scale-up of Dorr-Oliver or Xcell forced air flotation machines and Wemco self-aspirated flotation equipment cells was accomplished by maintaining geometric and hydrodynamic similarity within the product line. The hydrodynamic functions are a set of dimensionless numbers which include Reynolds number, Power number, Froude number, superficial gas
Oct 09, 2015 · This figure, divided by the capacity in cubic feet of any particular type of flotation cell, will give the number of such cells needed. In the case of the Southwestern Air-Lift Machine it must be divided by 9.85 (the volume in cubic feet of one foot of machine), which …
The bubble surface area flux is directly related to the flotation rate constant (Gorain et al., 1997), and can be either estimated (Gorain et al., 1999) or calculated, given that both J g and d 32
Two-phase (water and air) flow in a self-aspirated WEMCO flotation machine has been investigated using computational fluid dynamics (CFD). The geometric model is a replica of a 300 m 3 cell
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