Distribution Ratios of Phosphorus Between CaO-FeO-SiO2-Al2O3/Na2O/TiO2 Slags and Carbon-Saturated Iron
Distribution Ratios of Phosphorus Between CaO-FeO-SiO2-Al2O3/Na2O/TiO2 Slags and Carbon-Saturated Iron
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DOI：
10.1007/s11663-017-1023-8
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发表时间：
2017-07
期刊：
影响因子：
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通讯作者：
Feng-shan Li;Xianpeng Li;Shu-feng Yang;Yan-ling Zhang
中科院分区：
文献类型：
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作者：
Feng-shan Li;Xianpeng Li;Shu-feng Yang;Yan-ling Zhang
为了有效地提高脱磷效率，本研究通过实验室实验，考察了磷在CaO-FeO-SiO_2-Al_2O_3/Na_2O/TiO_2渣系与含碳铁(L{P})之间的分配比，以及不同温度、各渣组分浓度等因素对磷分配比的影响。热力学模拟结果表明，加入Na2O和Al_2O_3后，CaO-FeO-SiO_2渣液相区明显增大，当加入适当浓度的Al_2O_3和Na_2O时，它们起到助熔剂的作用。实验数据表明，$$L{\Text{P}}^{\Text{Fe-C}}$$LPFe-C随渣中二元碱度的增加而增加，且碱度的影响大于温度和FeO含量；$$L_{\Text{P}}$$LPFe-C随着Na2O含量的增加和Al_2O_3含量的降低而增加。与钢水脱磷相比，对于本研究研究的铁水脱磷工艺，渣中FeO含量对$$L{\Text{P}}^{\Text{Fe-C}}$$LPFe-C的影响小于温度和炉渣碱度等其他因素。根据实验数据，通过回归分析，可将LOG L{\TEXT{P}}^{\TEXT{Fe-C}}$$LOGLPFe-C表示为：$$\BEGIN{ALIGNED}\LOG L{\TEXT{P}}^{\TEXT{Fe-C}}&=0.059({\TEXT{PCT}}\；{\Text{CaO}})+1.583\Log({\Text{TFe}})-0.052\Left({{\Text{Pct}}\；{\Text{SIO}}_{2}}\Right)-0.014\Left({{\Text{Pct}}\；{\Text{Al}}_{2}{\Text{O}}_{3}}\右)\，&\Quad+0.142\Left({{\Text{Pct}}\；{\Text{Na}}_{2}{\Text{O}\Right)-0.003\Left({{\Text{Pct}}\；{\Text{Tio}}_{2}}\Right)+0.049\Left({\Text{Pct}}\；{\Text{P}}_{2}{\Text{O}}_{5}}\Right)+\FRAC{13{，}527}{T}-9.87.\结束{已对齐}$$logLPFe-C=0.059(pctCaO)+1.583log(TFe)-0.052pctSiO2-0.014pctAl2O3+0.142pctNa2O-0.003pctTiO2+0.049pctP2O5+13,527T-9.87.
In order to effectively enhance the efficiency of dephosphorization, the distribution ratios of phosphorus between CaO-FeO-SiO2-Al2O3/Na2O/TiO2 slags and carbon-saturated iron ($$ L_{\text{P}}^{\text{Fe-C}} $$LPFe-C) were examined through laboratory experiments in this study, along with the effects of different influencing factors such as the temperature and concentrations of the various slag components. Thermodynamic simulations showed that, with the addition of Na2O and Al2O3, the liquid areas of the CaO-FeO-SiO2 slag are enlarged significantly, with Al2O3 and Na2O acting as fluxes when added to the slag in the appropriate concentrations. The experimental data suggested that $$ L_{\text{P}}^{\text{Fe-C}} $$LPFe-C increases with an increase in the binary basicity of the slag, with the basicity having a greater effect than the temperature and FeO content; $$ L_{\text{P}}^{\text{Fe-C}} $$LPFe-C increases with an increase in the Na2O content and decrease in the Al2O3 content. In contrast to the case for the dephosphorization of molten steel, for the hot-metal dephosphorization process investigated in this study, the FeO content of the slag had a smaller effect on $$ L_{\text{P}}^{\text{Fe-C}} $$LPFe-C than did the other factors such as the temperature and slag basicity. Based on the experimental data, by using regression analysis, $$ \log L_{\text{P}}^{\text{Fe-C}} $$logLPFe-C could be expressed as a function of the temperature and the slag component concentrations as follows: $$ \begin{aligned} \log L_{\text{P}}^{\text{Fe-C}} & = 0.059({\text{pct}}\;{\text{CaO}}) + 1.583\log ({\text{TFe}}) - 0.052\left( {{\text{pct}}\;{\text{SiO}}_{2} } \right) - 0.014\left( {{\text{pct}}\;{\text{Al}}_{2} {\text{O}}_{3} } \right) \\ \, & \quad + 0.142\left( {{\text{pct}}\;{\text{Na}}_{2} {\text{O}}} \right) - 0.003\left( {{\text{pct}}\;{\text{TiO}}_{2} } \right) + 0.049\left( {{\text{pct}}\;{\text{P}}_{2} {\text{O}}_{5} } \right) + \frac{13{,}527}{T} - 9.87. \\ \end{aligned} $$logLPFe-C=0.059(pctCaO)+1.583log(TFe)-0.052pctSiO2-0.014pctAl2O3+0.142pctNa2O-0.003pctTiO2+0.049pctP2O5+13,527T-9.87.