SYSTEMS:UDC 622. 765,4~622.364 The rate of selective flotation of a mineral from an ore is ultimately determined by the rate of formation of mineralized foam from the flotation aggregates (aeroflocculation). In these processes great importance attaches to the structure of the foam, which depends on the compositions and structures of the flotation reagents, the grain size of the flotated mineral, the degree of dispersity of the air, and the hydrodynamic conditions in the flotation cell.In [1,2] it was shown that coalescence in the slurry of a fotation aggregate (aerofloccule) may lead to the formation of various mineralized foams, differing in their properties and morphological features. Limited structural coalescence of liquid films easily leads to the accumulation of flotation aggregates and the formation of dense foam-aggregates; and, if there is a marked tendency to this coalescence, film-structured foams will be formed.Klassen [3] discusses the conditions for the formation of a flotation aggregate in connection with active adhesion of micro-bubbles of air to the mineral surfaces, and the significance of the properties of foams of various structures in the flotation of coals.Berger [4,5] showed that the formation of aggregate foams is an effective means of selective flotation of many slightly hydrophobized minerals.Typical aggregate foams are not capable of any appreciable subsequent flocculation: this explains their long lives in closed vessels, where they may last for months without visible change. Qualitatively, their structural and mechanical properties are analogous to thixotrop~ on agitation, up to the detachment of part of the aggregate, they become very mobile and recover their original high viscosities for as long as the agitation continues.In their original states, film-structured foams are not very long-lived~ and easily decompose into their structural elements. In many cases their decomposition does not go to completion, and we are left with a foam which we must regard as flocculated. All mixed foams, consisting of regions where structural coalescence is developed and regions where it is weak, are easily subjected to floceulation and then form dense foams containing smaller air bubbles than those in the original foam. Such foams are formed, over wide dispersity ranges, in industrial cells.
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