Effect of Slag Basicity on Dephosphorization at Lower Basicity and Lower Temperature Based on Industrial Experiments and Ion-Molecular Coexistence Theory
Effect of Slag Basicity on Dephosphorization at Lower Basicity and Lower Temperature Based on Industrial Experiments and Ion-Molecular Coexistence Theory
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DOI：
10.1007/s11663-021-02270-y
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发表时间：
2021-07
期刊：
影响因子：
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通讯作者：
Han Sun;Jian Yang;Runhao Zhang;Wenkui Yang
中科院分区：
文献类型：
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作者：
Han Sun;Jian Yang;Runhao Zhang;Wenkui Yang
In the present work, the effect of dephosphorization slag basicity on the dephosphorization of hot metal has been studied in the lower temperature range of 1370 °C to 1420 °C and the lower basicity of 1.26 to 2.20 with new double slag converter steelmaking process (NDSP). Based on the ion-molecule coexistence theory (IMCT), the thermodynamic model IMCT-Niof dephosphorization slag is established. With increasing basicity from 1.26 to 2.20, the phosphorus distribution ratioLPbetween hot metal and slag increases. The dephosphorization ratio and the decarbonization ratio both increase, while the demanganization ratio decreases. The morphologies of P-rich phase change from long strip shape (B= 1.26-1.37) to dendritic shape (B= 1.50) and to massive shape (B= 1.71-2.20). The area of P-rich phase increases from about 4μm2to about 8000μm2. The content of P2O5in the P-rich phase increases and the value of the coefficientninnC2S-C3P of the P-rich phase decreases from 6-20 to 1-2. The phosphorus-enrichment contribution ratio of calcium silicate is in the order of>>>. The phosphorus-enrichment degree in dephosphorization slag is enhanced mainly by C2S-C3P. With increasing basicity, the calculated results of IMCT-(pct C2S-CjP) andare well consistent with the measurement results of AP-rich phaseand (pct P2O5)P-rich phaseof industrial experiment, indicating that the IMCT calculated results can correctly express the phosphorus-enrichment degree of dephosphorization slag.
