Flotation bubble rise velocity

However, more than 50 years later, some of the details of the formation of flotation foams continue to be investigated. In a recent review [63], two types of frothers were compared Dowfroth MIBC (lower ketones with admixed alcohols and aldehydes) and Triton X-100. The rising velocity of bubbles in flotation columns depended on the frother type to the extent to which their inhibition factor rose which is due to the difference of the type of adsorption layers at the 1/g interfaces. In [64], the effect of similar frothers on the bubble rise velocity (from 0.9 to 2.7 mm in size) was investigated in flotation columns as a function of the frother... 

There is the possibility of non-reagent flotation. Because of non-retardation of surfaces and a high velocity of bubble rising, the normal component of the hydrodynamic field of bubbles is sufficiently large to provide hydrodynamic pressing forces to ensure the electrostatic barrier is overcome (cf Fig. 10.8). 

The method which exploits the natural rising velocity of bubbles, without any external electric field, is the so-called flotation potential method [7-16]. Indeed, the charge-raising bubbles create an electric current, which develops a measurable electric potential difference, A, between two sufficiently distant points (Dorn s effect). The relation between the potential of the bubbles and A is... 

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