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To investigate the effect of frother concentration on bubbles and their tail vortex zone characteristics in flotation is an important prerequisite for predicting the probability of particle coiling in the trailing vortex zone of flotation bubbles The flow field characteristics of the bubble trailing vortex region under different sec octyl alcohol 2 octanol foaming agents were studied
·Semantic Scholar extracted view of "Effect of flotation frothers on bubble size and foam stability" by Cho et al The objective of this project was to compare the effect of a selective flotation frother MIBC and powerful frothers DEMPH and DF 1012 on bubble size and foamability in water and in brine In Expand 73
·features and flotation performance will follow We will end off with conclusions drawn from this study Experimental work A series of batch flotation tests was done at the University of Stellenbosch in South Africa on a l Barker laboratory flotation cell equipped with a fixed rotor and aerator unit
In a mineral flotation system the prediction of the bubble terminal rising velocity can be carried out in the following three bubble size ranges determined by Reynolds number 10 100 μm; 128 1920 μm; 1920 3190 μm diameter bubbles Slip velocity of 10 100 μm bubble in a mm flotation column Under conditions where the Reynolds
·The results allow us to quantify for the first time the reduction in bubble size in a three phase flotation system and the improvement in froth stability due to the use of a stator and thus the
Mineral froth flotation is used to separate particles of valuable mineral from its associated gangue It involves the selective separation of the hydrophobic particles from the slurry into the froth As air is blown into the slurry the hydrophobic particles attach to the air bubbles while the waste particles remain in suspension While the froth rises up bubbles start to coalesce and burst
Download scientific diagram Arrangement of floating bubbles data Rows represent the three frother concentration levels and columns the three volumetric air flowrate levels treatments Each
·Flotation was first performed in 1860 Arbiter 2000 and is a technology that utilizes the differences in physicochemical properties of various mineral surfaces to achieve specific separation Wills and Munn 2005 as depicted in Fig process involves hydrophobic particles adhering to air bubbles being transported to the froth layer whereas
·It has been established 4 that bubble size nominally Db or the Sauter mean size D32 in the pulp phase is directly related to the ppm concentration of frother in the aqueous phase of the pulp Figure 4a and that the CCC for a given frother will increase with air rate Jg as modeled by Nesset 13 Knowledge of the CCC critical coalescence
·frother concentration gradient between the bulk solution and the bubble interface is the driving force contributing to bubble size reduction Key words flotation; frother; bubble size; frother partitioning; total organic carbon TOC analysis; concentration gradient 1 Introduction Frothers are one of the key reagents added to the
·Thus this Special Issue focuses on recent advances in fine particles and bubble flotation that are worth further study and application Meanwhile this collection provides guidance for those engaged in research on fine flotation featuring studies including but not limited to the following topics fine particle flotation microbubble flotation nanobubble flotation
·The paper presents a correlation between the critical coalescence concentration and hydrophilic lipophilic balance / molecular weight ratio for surfactants used as flotation frothers
·Figure 2 Schematic diagram of the effect of frother concentration on bubble size Grau et al 2005 By measuring the bubble size as a function frother concentration the CCC can be determined for a given frother Figure 3 shows the bubble size as a function of concentration for polyglycol frothers
·Froth flotation is a method for physical separation of particles based on differences in the ability of air bubbles to selectively adhere to specific mineral surfaces in mineral/water slurry [10
This thesis reports the effects of solids hydrophobic and hydrophilic on gas holdup bubble size and water overflow rate with different frother types in a continuous flotation column setup
·The experiments described herein indicate that the frothers control the size of bubbles in flotation systems by controlling bubble coalescence At frother concentrations C lower than CCC the bubble size mainly results from coalescence The ability of frothers to prevent bubble coalescence is well characterized by the critical coalescence
Introduction Froth stability plays an important role in determining selectivity and recovery in flotation Farrokhpay 2011 It should be noted that froth with very high stability is not desirable because in addition to recovering the particles attached to the bubbles it creates favourable conditions for entrainment Zheng Franzidis and Johnson 2006
Unless otherwise mentioned this sample was utilized in the flotation tests Sample 2 was blended with a very fine silica d50 15 lm Methods dbccc Zone I Zone II CCC Frother concentration Fig 2 Schematic diagram of the effect of the frother concentration upon bubble size in a flotation cell Grau et al 2005
·of water and air bubbles forming an envelope around the bubbles which prevents them from colliding or touching Frothers also lower the surface tension of the water The forces created around the air bubble in the presence of a frother prevent the bubbles from collapsing [7] Two edited books frothing in flotation volume I and II give a compre
·The experimental work was conducted in a 50 dm 3 Outokumpu laboratory flotation cell Bubble size distributions were measured at only one location in the cell 110 mm above the plane of the stator as shown in Fig a non coalescing environment it can be assumed that the bubble size distribution is entirely determined in the impeller/stator zone and
·Table 4 shows that i the frother characterization parameters CMV CCC and CMH can be easily determined by empirical equations proposed in this work for CCC and CMV as well as for CMH and ii the equations can be successfully used to predict the terminal bubble velocity concentration bubble shape concentration and foam height
·Most of the literature ascribe the role of salts on bubble size reduction to their ability to prevent coalescence as some salt ions appear to retard the drainage of inter bubble film [2 7 14 17 39
·Figure 2 Hydrodynamic zones in a mechanical flotation cell Figure 3 Schematic diagram of formation of bubbles in mech anical cells after Grainger Allen 1970; courtesy of Transactions of the Institute of Metallurgy UK bubble}particle aggregates rise up in a relatively less turbulent region This region also helps in reducing
· Laskowski et al 2003 pointed out that a frother with a high DFI value and low CCC values was more powerful in terms of producing a more stable foam; generating finer bubbles and to some extend be potentially more suitable for the flotation of coarse particles Whereas a frother that showed a low DFI and high CCC values was normally a
·Froth flotation is a widely used process of particle separation exploiting differences in surface properties It is important to point out that overall flotation performance grade and recovery
·The importance of frothers in flotation is widely acknowledged particularly in terms of their role with respect to bubble size and the stability and mobility of the froth phase
