Effect of Na2O on the enrichment behavior of phosphorus in the slag system CaO-SiO2-Fe2O3-P2O5

He Sai; Liu Yaqin; Lin Lu; Hou Zhongxiao; Huang Fang; Hu Yanbin

doi:10.7513/j.issn.1004-7638.2022.02.021

Volume 43 Issue 2

May 2022

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He Sai, Liu Yaqin, Lin Lu, Hou Zhongxiao, Huang Fang, Hu Yanbin. Effect of Na2O on the enrichment behavior of phosphorus in the slag system CaO-SiO2-Fe2O3-P2O5[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(2): 140-145. doi: 10.7513/j.issn.1004-7638.2022.02.021

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He Sai, Liu Yaqin, Lin Lu, Hou Zhongxiao, Huang Fang, Hu Yanbin. Effect of Na₂O on the enrichment behavior of phosphorus in the slag system CaO-SiO₂-Fe₂O₃-P₂O₅[J]. IRON STEEL VANADIUM TITANIUM, 2022, 43(2): 140-145. doi: 10.7513/j.issn.1004-7638.2022.02.021

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Effect of Na₂O on the enrichment behavior of phosphorus in the slag system CaO-SiO₂-Fe₂O₃-P₂O₅

doi: 10.7513/j.issn.1004-7638.2022.02.021

Metallurgical Technology Institute, Central Iron and Steel Research Institute, Beijing 100081, China

Received Date: 2022-02-06
Available Online: 2022-05-11
Publish Date: 2022-04-28

Abstract

Abstract

In this paper, the effects of Na₂O in slag on the existing forms, the law of phase precipitation and the phosphorus enrichment behavior of phosphorus-containing slag are systematically studied by high-temperature experiments in MoSi₂ furnace and analyzed by FactSage, SEM and XRD. The research results show that: for the CaO-SiO₂-Fe₂O₃-P₂O₅ slag system, the addition of Na₂O will replace solid solution calcium of nC₂S-C₃P, forming Na₂Ca₄ (PO₄)₂SiO₄ solid solution. As the content of Na₂O increases to excess, the content of Ca and Si in P-solid solution (Na₂Ca₄(PO₄)₂SiO₄) reduces, and the Na₃PO₄ phase produces the grade of phosphorus in the P-rich phase increases. With the increase of the content of Na₂O in slag, the melting point of the slag decreases significantly, the content of phosphorus in the P-rich phase increases significantly, and the content of P₂O₅ exceeds 30%, which ultimately meets the requirement of phosphorus content in the steel slag phosphate fertilizer. Therefore, adding an appropriate amount of Na₂O (less than 6%) in the steel making process instead of CaF₂ as the fluxing agent can promote the phosphorus enrichment effect in the slag, and the converter slag can be used as a phosphate fertilizer.
- phosphorus-containing converter slag,
- steelslag phosphate fertilizer,
- phase precipitation,
- enrichment behavior,
- resource recovery

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References(21)

References

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