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实验室条件下采用间接测量法,测定了CaF2系和B2O3系脱磷渣的磷分配。即首先测量磷在液态渣和固态铁间的分配比,再通过计算得到磷在液态渣和铁水之间分配比,同时根据渣系成分和光学碱度计算了磷容量。同时采用了扫描电镜、能谱分析与X射线衍射分析技术对脱磷渣进行了研究。实验结果表明,B2O3系预脱磷渣的磷容量远大于CaF2系预脱磷渣的磷容量,因此可以用B2O3全部替代CaF2作为助熔剂进行高磷铁水的预脱磷处理,2种渣系的磷分配均随渣中有效CaO含量的升高而升高。用B2O3作为助熔剂时,B2O3能与渣中高熔点物质2CaO·SiO2和3CaO·P2O5反应生成低熔点物质,从而起到助熔的作用。且w(B2O3)/w(CaO)比值为0.16时,磷分配比为最高值,即该渣脱磷能力最强。
Under laboratory conditions, the phosphorus distribution of CaF2-based and B2O3-based dephosphorized slag was determined by indirect method. Firstly, the distribution ratio of phosphorus between liquid slag and solid iron was measured, then the distribution ratio of phosphorus between liquid slag and molten iron was calculated, and the phosphorus capacity was calculated according to the slag composition and optical basicity. At the same time, the use of scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction analysis of dephosphorization slag was studied. The experimental results show that the phosphorus content of B2O3 pre-dephosphorized slag is much larger than that of CaF2 pre-dephosphorized slag, so B2O3 can be used as a flux to pre-dephosphorize the high-phosphorus hot metal. The distribution of phosphorus increased with the increase of available CaO in the slag. When B2O3 is used as a flux, B2O3 can react with 2CaO · SiO2 and 3CaO · P2O5, which are high-melting substances in the slag, to produce low-melting substances, thereby contributing to the fluxing. And the ratio of w (B2O3) / w (CaO) is 0.16, the phosphorus distribution ratio is the highest value, that is, the dephosphorization ability of the slag is strongest.