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| Effect of Al2O3/TiO2/Na2O on enrichment of phosphorus in P-bearing steelmaking slag |
| Kan Yu 1 , Yan-ling Zhang 1 , Feng-shan Li 1 , Ming Gao 1 |
| 1 State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China |
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Abstract To explore the influence of Al 2 O 3 /TiO 2 /Na 2 O on the mineralogical structure and phosphorus enrichment of converter slag, phosphorus enrichment and distribution in the CaO–SiO 2 –Fe 2 O 3 –MgO–Al 2 O 3 /TiO 2 /Na 2 O slag system were experimentally examined. The results show that phosphorus mainly exists in an n2CaO SiO 2 –3CaO P 2 O 5 (nC 2 S–C 3 P) solid solution. Al 2 O 3 /TiO 2 /Na 2 O is beneficial for phosphorus enrichment in the CaO–SiO 2 –Fe 2 O 3 –MgO slag system to various degrees. This allows screening and separation of the enriched phase in the slag. When Al 2 O 3 content was increased from 0 to 15%, the P 2 O 5 content in the P-rich phase increased from 13.88 to 21.32%, and the area of the P-rich phase decreased from 57.50 to 37.87%. When the TiO 2 content was increased from 0 to 10%, the content of P2O5 in the P-rich phase increased from 13.88 to 22.90%, and the area of the P-rich phase decreased from 57.50 to 39.20%. When the contents of Al 2 O 3 and TiO 2 were increased, the previously formed nC 2 S–C 3 P solid solution transformed into n0C 2 S–C 3 P (n\ n0) with higher phosphorus content. Na 2 O had no significant effect on phosphorus enrichment, but exerted significant influence on the area of the P-rich phase. When the Na 2 O content was increased from 0 to 8%, the previously formed nC 2 S–C 3 P solid solution gradually became Na 2 Ca 4 (PO 4 ) 2 SiO 4 , and the area of the P-rich phase increased from 57.50 to 68.50%. With increasing the content of ATN (a mixture with a mass ratio of Al 2 O 3/TiO 2 /Na 2 O = 15:4:3) from 0 to 30%, the content of P 2 O 5 increased from 13.88 to 42.10% and the area of the P-rich phase decreased from 54.92 to 18.40%.
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| Cite this article: |
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Kan Yu,Yan-ling Zhang,Feng-shan Li, et al. Effect of Al2O3/TiO2/Na2O on enrichment of phosphorus in P-bearing steelmaking slag[J]. Journal of Iron and Steel Research International, 2019, 26(8): 796-805.
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2019, Vol. 26 
