In this paper some of the major issues in the use of slags during the production of clean steels will be discussed. These issues are: centre dot The separation of a buble or an inclusion at a slag-metal interface and subsequent particle dissolution. centre dot The environmental stability of a liquid slag centre dot The response of a liquid slag to a thermal gradient The slag as a refiner is well documented; however, the design of slags for solid or liquid inclusion or gas bubble removal is as yet a largely unexplored area. Results from high temperature experiments utilizing in situ observation methods such as X-ray fluoroscopy and Confocal Scanning Microscopy will be presented and the results discussed in view of clean steel production. The stability of slags with respect to the volatilization of compounds leading to both potentially hazardous emissions as well as unwanted changes in slag properites will be discussed based on recent experimental and computational findings. Experimental results on aslag crystallization will be discussed based on performed experiments designed to investigate the effects of thermal fields and chemistries of slag and atmosphere.
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