Abstract
The substitution effect of Al2O3 for CaF2 on hot metal dephosphorisation has been studied at 1723 K. The initial composition of the slag was 40%CaO (mass percentage)+52%Fe2O3+8%CaF2. Then, Al2O3 was substituted for CaF2 up to 8%. The hot metal initial silicon was 0·61%, and the P contents were 0·063, 0·073 and 0·091%. Experimental results showed that with increasing Al2O3 content, the melting point of the slag slightly increased, and the oxidising power and phosphate capacity for the slag were enhanced, which led to an increase in dephosphorisation. The range of phosphorus content at the end point was between 0·009 and 0·014%, and the corresponding dephosphorisation varied from 82·5 to 89·0%. This result may be acceptable for industrial use.
Acknowledgements
The project was supported by the National Natural Science Foundation and Steel Research Combination Foundation of China (grant no. 51074203) and the Anhui Province Natural Science Foundation (grant no. 1308085ME62).