磷在CaO-FeO^＊-SiO2-P2O5-CaF2渣和铁水间的分配  

Experimental study on phosphorus distribution between CaO-FeO^＊ -SiO2-P2O5-CaF2 slag and hot metal

作　　者：周进东[1] 毕学工[1] 杨福[1] 

机构地区：[1]武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,湖北武汉430081

出　　处：《炼钢》2013年第5期56-60,共5页Steelmaking

基　　金：国家科技支撑计划资助项目(2007BAB15B04)

摘　　要：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1573K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ω（P）：2．45％～4．25％，氟磷酸钙中ω（P）=22．99％～27．16％。The indirect measurement approach was used in this paper in measurement of the distribution of phosphorus between slag and carbon-saturated hot metal for higher iron oxide contents slag. The distribution ratio of phosphorus between slag and solid iron was measured firstly, and then the ratio between slag and carbon-saturated hot metal was obtained through conversion, and the dephosporization capacity of CaO-FeO^＊-SiO2- P2O5（15 %）-CaF2 systems at 1 573 K was investigated. In the mean time, the techniques of scanning electronic microscope, energy spectrum analysis and X-ray diffraction were applied to study the form of phosphorus presence in the dephosphorization slag. The results show that. the phosphorus distribution ratio decreases with the increase of FeO^＊ when the basicity is about 7. 0; the phosphorus distribution ratio decreases with the increase of w（CaO）/w（SiO2） when w（CaO）/w（SiO2） is over 3.76; higher phosphorus absorption capacities can be ensured by reasonably decreasing w（CaO）/w（SiO2） when w（FeO^＊） is higher; the phosphorus-containing phases are liquid slag and Cas（PO4）3F, and the mass fraction of phosphorus in these two phases are 2. 45 %- 4. 25 % and 22.99 %-27. 16 % respectively.

关 键 词：高磷铁水 脱磷预处理 磷分配 

分 类 号：TF704.4[冶金工程—钢铁冶金]