Abstract
Drops and bubbles are of great importance to the extractive metallurgist in his attempts to speed up processes by the use of sprays, foams, and jets. In this lecture the ways in which bubbles bring about mass transfer in liquid metals and in slag metal reactions are described. The role of interfacial turbulence is considered together with the effects of bubble size and frequency and the properties of the slag and metal phases. Reactions between drops of metal and flowing gases are analyzed in terms of mass transfer in the reacting phases and of chemical steps at the interface. Recent results obtained on reactions involving metal drops falling through liquids are considered in relation to mass transfer models in which internal circulation plays an important part. The work described reports only one facet of the rapidly developing subject of Process Engineering which ought now to feature prominently in metalurgical education.
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