预制铁酸钙技术对钒钛磁铁矿烧结行为的影响  

Effect of preformed calcium ferrite addition on sintering behavior of vanadium titanomagnetite

作　　者：谢皓 李刚[1] 吕学伟 孙小东[1] 何海熙 Xie Hao;Li Gang;Lv Xuewei;Sun Xiaodong;He Haixi(CISDI-INFO Co.,Ltd.,Chongqing 400041,China;College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China)

机构地区：[1]中冶赛迪信息技术(重庆)有限公司,重庆400041 [2]重庆大学材料科学与工程学院,重庆400044

出　　处：《钢铁钒钛》2023年第4期117-124,共8页Iron Steel Vanadium Titanium

基　　金：国家自然科学基金(51974048)。

摘　　要：针对钒钛磁铁矿在烧结过程中的成品率低、强度差、能耗高等问题,提出了预制铁酸钙烧结新技术,并通过压块焙烧试验和热分析测试揭示该技术的可行性及理论依据。结果表明,随着预制铁酸钙替代生石灰比例增加,焙烧产物微观形貌由粒状结构向熔蚀结构转变,四元复合铁酸钙(SFCA)含量增加,钙钛矿含量降低,有利于焙烧过程的液相生成,烧结孔洞熔合程度增大,平均孔隙率从42.9%下降到36.2%,促进基体的致密化。升温过程中铁酸钙液相的生成可分为三个反应,根据生成温度由低到高依次为CF+CF_(2)→L的共熔反应,SFCA-I及SFCA的熔化分解反应;预制铁酸钙的加入可降低初始液相的产生温度,整体提高烧结液相量,提高比例约9%;预制铁酸钙技术可促进铁氧化物向初始液相中熔解,增加铁酸钙含量,促进固-液同化反应。In view of the problems of low yield,poor strength and high energy consumption in the sintering process of vanadium titanomagnetite,a new sintering technology of preformed calcium ferrite is proposed in this paper,and its feasibility and theoretical basis are revealed through the tablet sintering and thermal analysis test.The results show that with the increase of substitution ratio(preformed calcium ferrite to partially substitute CaO),the microstructure of roasted products changes from granular structure to melting corrosion structure,the content of SFCA increases,while perovskite content decreases.In addition,the quantity of melts increases,the coalesce of sintering bubbles is promoted,the average porosity decreases from 42.9%to 36.2%,and the densification of the matrix is promoted.The formation of calcium ferrite melts in the heating process can be divided into three reactions,according to the formation temperature from low to high,it is the eutectic reaction of CF+CF_(2)→L,the melting of SFCA-I and SFCA,respectively;the addition of preformed calcium ferrite can reduce the generation temperature of initial melts,and increase the total sintering melts by about 9%;promote the melting of iron oxides into the initial melts,increase the content of calcium ferrite,and promote solid-liquid assimilation reaction.

关 键 词：烧结 钒钛磁铁矿 预制铁酸钙 热分析(TG-DSC) 

分 类 号：TF046[冶金工程—冶金物理化学]