炉渣物相变化对“双渣+留渣”冶炼工艺脱磷的影响  

Effect of change of slag phase on dephosphorization of “double-slag+slag-remaining” steelmaking technology

作　　者：夏云进 郭鑫 马伟杰 李杰 范鼎东 王世俊 XIA Yun-jin;GUO Xin;MA Wei-jie;LI Jie;FAN Ding-dong;WANG Shi-jun(School of Metallurgical Engineering, Anhui University of Technology, Maranshan 243002, Anhui, Chin)

机构地区：[1]安徽工业大学冶金工程学院

出　　处：《钢铁研究学报》2018年第6期434-440,共7页Journal of Iron and Steel Research

基　　金：钢铁联合研究基金资助项目(U1560109,U1660116);国家自然科学基金资助项目(51304002);安徽省科技攻关项目(1604a0902142);广东省科技攻关项目(2016B090931005)

摘　　要：通过扫描电镜等对＂双渣＋留渣＂工艺冶炼时脱磷渣的微观结构和物相组成进行了观察与分析,并对部分炉渣进行了热处理,研究了炉渣物相变化对脱磷的影响。研究结果表明：脱磷率较高的A1-A3脱磷渣中物相主要由铁酸钙及复杂的硅酸盐液相（Ca3TiFeSi3O（12）、Ca（54）MgAl2Si（16）O9）与固溶有磷酸钙的硅酸二钙固相（2Ca2SiO4·Ca3（PO4）2、Ca7（PO）4（SiO4）2）组成,而脱磷率较低的A4脱磷渣的物相主要为液相,A5脱磷渣物相主要为MnFe2O4、MnV2O4、Ca（12）Al（14）O（33）等,两者几乎没有发现富含磷的硅酸二钙固相;热处理前后A3脱磷渣物相变化不大,A4脱磷渣变化较大,热处理后物相变为灰色液相和白色树枝状RO相;＂双渣＋留渣＂冶炼工艺脱磷期炉渣中含有较多未溶解的CaO,而脱碳期炉渣中未溶解的CaO含量较少,脱磷炉渣物相中形成固相硅酸二钙颗粒对加快脱磷反应起重要作用。The microstructure and phase constituent of dephosphorization slag of ＂double-slag＋slag-remaining＂steelmaking technology were observed and analyzed by SEM,part of the slag were heat treatment,and the effect of the change of slag phase on dephosphorization was studied.The research results show that the phase of dephosphorization slag A1-A3 with high dephosphorization rate are composed of calcium ferrite,complex liquid silicate phase（Ca3TiFeSi3O（12）,Ca（54）MgAl2Si（16）O9）and 2 CaO·SiO2（C2S）solid phase solution with calcium phosphate（2Ca2SiO4·Ca3（PO4）2,Ca7（PO）4（SiO4）2）,the main phase of dephosphorization slag A4 with low dephosphorization rate is liquid phase,the main phases of dephosphorization slag A5 are MnFe2O4,MnV2O4,Ca（12）Al（14）O（33）,little phosphorus rich calcium silicate solid phase is found in both dephosphorization slag A4 and A5;the phase of dephosphorization slag A3 changes little before and after heat treatment,but the phase of dephosphorization slag A4 changes greatly after heat treatment,which changing to liquid phase and white branches like RO phase;the dephosphorization slag of＂double-slag＋slag-remaining＂steelmaking technology contain many un-dissolved CaO,but little is found in decarburization slag,the formation of C2S solid phase in dephosphorization slag plays an important role to accelerate the dephosphorization reaction.

关 键 词：“双渣+留渣”工艺 炉渣物相 脱磷 硅酸二钙 热处理 

分 类 号：TF713[冶金工程—钢铁冶金]