工程科学学报，第40卷，第2期：184-191,2018年2月 Chinese Journal of Engineering,Vol.40,No.2:184-191,February 2018 DOI:10.13374/j.issn2095-9389.2018.02.008;http://journals.ustb.edu.cn Mg0对含钛烧结矿矿相结构及软熔滴落性能的影响 郑安阳，刘征建⑧，苍大强，王耀祖，张建良 北京科技大学治金与生态工程学院，北京100083 ☒通信作者，E-mail:liuzhengjian(@usth.cdu.cn 摘要为了深入探究Mg0对烧结矿矿旷物组成及冶金性能的影响，采用扫描电子显微镜和荷重软化熔滴设备研究了Mg0对 含钛烧结矿矿相结构与软熔滴落性能影响.实验结果表明，随着烧结料中Mg0质量分数从2.04%增加到3.96%，烧结过程液 相生成量逐渐减少，烧结矿中的赤铁矿和铁酸钙等含量都有不同程度的降低，赤铁矿质量分数从13.57%降低到9.99%，铁酸 钙的质量分数由38.7%降低到30.17%，磁铁矿、硅酸盐和烧结矿中的孔洞逐步增加.因此，增加烧结矿中Mg0会降低烧结矿 中液相生成量，不利于烧结矿转鼓强度和还原性的提高.高碱度含钛烧结矿中的镁主要分布于烧结矿中复合铁酸钙相中，进 一步提高烧结矿中镁的质量分数，烧结可矿的磁铁矿相比例将增加，有一部分镁固溶于磁铁矿中：在高镁烧结矿中，也会形成一 定量的橄榄石，其中固溶有少量镁、钛等元素.随着烧结矿中Mg0质量分数的增加，开始软化温度逐渐升高，试样软化开始温 度均在1120℃以上，软化温度区间△1，随着Mg0含量的升高而逐渐变宽. 关键词烧结矿Mg0:矿相结构：含钛烧结矿：液相生成量：荷重软化熔滴性能 分类号TF046 Effects of MgO on the mineral structure and softening-melting property of Ti-containing sinter ZHENG An-yang,LIU Zheng-jian,CANG Da-qiang,WANG Yao-u,ZHANG Jian-liang School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China Corresponding author,E-mail:liuzhengjian@ustb.edu.cn ABSTRACT Certain requirements regarding the chemical composition of slag have to be satisfied to perform a stable blast furnace op- eration.Particularly,the ratio of Mgo to Al,O,in the slag is observed to have a significant influence on the fluidity and desulfurization ability of the slag,along with the the stability of the blast furnace.However,the amount of Mgo in the ore could not satisfy the smel- ting requirement of the blast furnace.Thus,Mg-containing flux has to be added into the ferrous burden.In the ferrous burden structure of the blast furnace that is observed in China,sinter generally accounts for more than 70%.Therefore,the effects of various concentra- tions of Mgo on the quality of sinter are of great significance and must be investigated in further detail.In this study,the influence of Mgo on the mineral structure and softening-melting property of Ti-containing sinter were investigated using scanning electronic micros- copy (SEM)-energy dispersive spectrometer(EDS)and drop testing.The results depict that increasing the concentration of Mgo from 2.04%to 3.96%results in a decrease in the contents of hematite and complex calcium ferrite in the sinter,whereas there is an in- crease in the mass of liquid phase,magnetite,and silicate.Further,the pore size also gradually increases.Additionally,the hematite content reduces from 13.57%to 9.99%,and the complex calcium ferrite in sinter reduces from 38.7%to 30.17%.Therefore,the increase of Mgo in sinter is unfavorable for the development of a liquid phase,which depicts a negative effect on the tumbler strength and reduction index of sinter.Mg in sinter is mainly distributed in complex calcium ferrite.Further,an increase in the concentration of MgO causes a gradual increase in the concentration of magnetite.Additionally,it also causes a part of Mg to be dissolved in magnetite 收稿日期：2017-08-14 基金项目：国家自然科学基金资助项目(51504216)工程科学学报,第 40 卷,第 2 期:184鄄鄄191,2018 年 2 月 Chinese Journal of Engineering, Vol. 40, No. 2: 184鄄鄄191, February 2018 DOI: 10. 13374 / j. issn2095鄄鄄9389. 2018. 02. 008; http: / / journals. ustb. edu. cn MgO 对含钛烧结矿矿相结构及软熔滴落性能的影响 郑安阳, 刘征建苣 , 苍大强, 王耀祖, 张建良 北京科技大学冶金与生态工程学院, 北京 100083 苣 通信作者, E鄄mail: liuzhengjian@ ustb. edu. cn 摘 要 为了深入探究 MgO 对烧结矿矿物组成及冶金性能的影响,采用扫描电子显微镜和荷重软化熔滴设备研究了 MgO 对 含钛烧结矿矿相结构与软熔滴落性能影响. 实验结果表明,随着烧结料中 MgO 质量分数从 2郾 04% 增加到 3郾 96% ,烧结过程液 相生成量逐渐减少,烧结矿中的赤铁矿和铁酸钙等含量都有不同程度的降低,赤铁矿质量分数从 13郾 57% 降低到 9郾 99% ,铁酸 钙的质量分数由 38郾 7% 降低到 30郾 17% ,磁铁矿、硅酸盐和烧结矿中的孔洞逐步增加. 因此,增加烧结矿中 MgO 会降低烧结矿 中液相生成量,不利于烧结矿转鼓强度和还原性的提高. 高碱度含钛烧结矿中的镁主要分布于烧结矿中复合铁酸钙相中,进 一步提高烧结矿中镁的质量分数,烧结矿的磁铁矿相比例将增加,有一部分镁固溶于磁铁矿中;在高镁烧结矿中,也会形成一 定量的橄榄石,其中固溶有少量镁、钛等元素. 随着烧结矿中 MgO 质量分数的增加,开始软化温度逐渐升高,试样软化开始温 度均在 1120 益以上,软化温度区间 驻tA随着 MgO 含量的升高而逐渐变宽. 关键词 烧结矿 MgO; 矿相结构; 含钛烧结矿; 液相生成量; 荷重软化熔滴性能 分类号 TF046 收稿日期: 2017鄄鄄08鄄鄄14 基金项目: 国家自然科学基金资助项目(51504216) Effects of MgO on the mineral structure and softening鄄melting property of Ti鄄containing sinter ZHENG An鄄yang, LIU Zheng鄄jian 苣 , CANG Da鄄qiang, WANG Yao鄄zu, ZHANG Jian鄄liang School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China 苣 Corresponding author, E鄄mail: liuzhengjian@ ustb. edu. cn ABSTRACT Certain requirements regarding the chemical composition of slag have to be satisfied to perform a stable blast furnace op鄄 eration. Particularly, the ratio of MgO to Al 2O3 in the slag is observed to have a significant influence on the fluidity and desulfurization ability of the slag, along with the the stability of the blast furnace. However, the amount of MgO in the ore could not satisfy the smel鄄 ting requirement of the blast furnace. Thus, Mg鄄containing flux has to be added into the ferrous burden. In the ferrous burden structure of the blast furnace that is observed in China, sinter generally accounts for more than 70% . Therefore, the effects of various concentra鄄 tions of MgO on the quality of sinter are of great significance and must be investigated in further detail. In this study, the influence of MgO on the mineral structure and softening鄄melting property of Ti鄄containing sinter were investigated using scanning electronic micros鄄 copy (SEM)鄄energy dispersive spectrometer (EDS) and drop testing. The results depict that increasing the concentration of MgO from 2郾 04% to 3郾 96% results in a decrease in the contents of hematite and complex calcium ferrite in the sinter, whereas there is an in鄄 crease in the mass of liquid phase, magnetite, and silicate. Further, the pore size also gradually increases. Additionally, the hematite content reduces from 13郾 57% to 9郾 99% , and the complex calcium ferrite in sinter reduces from 38郾 7% to 30郾 17% . Therefore, the increase of MgO in sinter is unfavorable for the development of a liquid phase, which depicts a negative effect on the tumbler strength and reduction index of sinter. Mg in sinter is mainly distributed in complex calcium ferrite. Further, an increase in the concentration of MgO causes a gradual increase in the concentration of magnetite. Additionally, it also causes a part of Mg to be dissolved in magnetite