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采用间接测量法测定了磷在渣和碳饱和铁水间的分配,即首先测量磷在渣和固态铁间的分配比,而后通过计算得到磷在渣和碳饱和铁水之间的分配比,研究了1 573 K下CaO-FeO*-SiO2-P2O5(15%)-CaF2渣系的脱磷能力。同时采用了扫描电镜、能谱分析与X射线衍射分析技术研究了磷在脱磷渣中的赋存形式。结果表明:碱度7.0左右时,磷分配比随FeO*的增加而下降;碱度超过3.76时,磷分配比随碱度的升高下降;FeO*较高时,适当降低碱度,可保证脱磷渣有较高的吸磷能力;含磷物相为液渣和氟磷酸钙,液渣中w(P)=2.45%~4.25%,氟磷酸钙中w(P)=22.99%~27.16%。
The distribution of phosphorus in slag and carbon-saturated molten iron was determined by indirect method, that is, the distribution ratio of phosphorus between slag and solid iron was firstly measured and then the distribution ratio of phosphorus between molten slag and carbon-saturated molten iron was calculated. Dephosphorization capacity of CaO-FeO * -SiO2-P2O5 (15%) - CaF2 slag system at 1 573 K. At the same time, using scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction analysis of phosphorus in the dephosphorization slag in the form. The results showed that when the basicity is about 7.0, the distribution ratio of phosphorus decreases with the increase of FeO *. When the alkalinity exceeds 3.76, the distribution ratio of phosphorus decreases with the increase of alkalinity. When the content of FeO * is higher, Phosphates have high phosphorus uptake capacity; phosphorus-containing phase is liquid slag and fluorophosphate, w (P) = 2.45% ~ 4.25% in liquid slag and w (P) = 22.99% ~ 27.16 in fluorophosphate %.