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The value of the optical basicity method for predicting the phosphorus and sulphur capacity of metallurgical slags was assessed. This involved: - an evaluation of the accuracy of published literature sources of slag/metal and slag/gas studies; - incorporation of selected data sets into a databank for testing existing relationships and deriving new ones and - a theoretical study to derive new optical basicities for individual oxides of the transitional element group in order to obtain satisfactory values applicable to both sulphur and phosphorus relationships. Since the existing relationships involving optical basicity were inadequate for obtaining an accurate description of the sulphur and phosphorus capacities over the whole range of ferrous metallurgical slags, new relationships were derived by using multiple regression techniques. Methods of calculating oxygen activities were investigated in order to convert capacity predictions to sulphur and phosphorus partitions. An experimental study was carried out to generate slag/metal data in areas of interest to the steelmaking industry, by equilibrating slag and metal in an electromagnetically rotated crucible. The results obtained were used to check the accuracy of the derived equations for predicting results not included in the regression set.

Additional information

Authors: YOUNG R W, British Steel plc, London (GB)
Bibliographic Reference: EUR 13176 EN (1991) 78 pp., FS, ECU 8.75
Availability: (2)
ISBN: ISBN 92-826-2078-6
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