Physical Model of the Barbotage Process of Aluminium

摘要

The high quality of aluminium and its alloys is one of the most important aims of today's aluminium industry. This aim can be reached by refining process, especially barbotage. Knowledge about the mechanism of this process is very helpful to improve it. Refining is dependable on some processing parameters like: the flow rate of refining gas and the speed of the impeller. These parameters influence the shape and size of gas bubbles. There are four patterns of dispersion of the gas bubbles in the liquid metal: no dispersion, minimum, intimate and uniform. The short characteristics of these schemes have been presented in this paper. The physical model was created to determinate the level of gas bubble dispersion in liquids. Research was done as an analogy of the process of argon dispersion or other inert gas in liquid aluminium. Research was carried out for changing parameters: the flow rate of refining gas: 0-r 17.5 dmVmin and the speed of impeller: 0-400 rpm. The fifth case of dispersion was found: over - dispersion. The range selection of the processing parameters value for these five schemes was done.