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工程科学学报,第38卷,第5期:609616,2016年5月 Chinese Journal of Engineering,Vol.38,No.5:609-616,May 2016 D0l:10.13374/j.issn2095-9389.2016.05.003:http://journals.ustb.edu.cn 高炉灰为还原剂对海滨钛磁铁矿直接还原焙烧磁选一 钛铁分离的影响 胡天洋12》,孙体昌2》区,寇珏2》,耿超2,高恩霞2》 1)北京科技大学土木与环境工程学院,北京1000832)北京科技大学金属矿山高效开采与安全教有部重点实验室,北京100083 区通信作者,E-mail:sunte@(ces.usth.edh.cm 摘要对高炉灰在直接还原培烧一弱磁选工艺中用作印尼某海滨钛磁铁矿还原剂的可行性及其机理进行研究.结果表明, 以萤石为添加剂的条件下,高炉灰可代替煤做还原剂,通过高炉灰与萤石的共同作用,可以在直接还原过程中提高还原铁粉 中铁的回收率及品位并降低T02质量分数,同时回收高炉灰中铁.三种不同产地高炉灰还原效果的比较表明,高炉灰性质对 还原效果有影响.在相同用量条件下,津鑫高炉灰(X)还原效果最好:在X高炉灰用量30%、萤石用量10%、焙烧温度 1250℃以及培烧时间为60mi时,焙烧产物通过两段磨矿和两段磁选,最终得到最佳的还原铁粉中铁品位为91.28%,Ti02质 量分数降至0.93%,包括海滨砂矿旷和高炉灰中铁的铁总回收率达到89.19%. 关键词钛磁铁矿:高炉灰:直接还原:焙烧:磁分离 分类号TF556:TD951 Effect of blast furnace dust as a reductant on direct reduction roasting for separating titanium and iron in seaside titanomagnetite HU Tian-yang),SUN Ti-chang,KOU Jue),GENG Chao),GAO En-xia) 1)School of Civil and Environmental Engineering,University of Science and Technology Beijing,Beijing 100083,China 2)Key Laboratory of the Ministry of Education for Efficient Mining and Safety of Metal Mines,University of Science and Technology Beijing,Beijing 100083,China Corresponding author,E-mail:sunte@ces.ustb.edu.cn ABSTRACT The feasibility and mechanisms of using the blast furace dust as a reductant in direct reduction-ow intensity magnetic separation of Indonesian seaside titanomagnetite were investigated.The results show that the blast furnace dust can be used as an alter- native to coal as a reductant under the condition of fluorite as an additive.Under the synergistic effect of the blast furnace dust and flu- orite,the recovery and grade of iron in the reduction iron powder can be increased and the content of TiO,can be decreased at the same time during the direct reduction process.Simultaneously,iron in the blast furnace dust can also be recovered.A comparison of three different kinds of blast furnace dusts indicates that the composition of the blast furnace dust can influence the effect of reduction. Under the same dust dosage,the Jinxin blast fumace dust (referred to as JX)show the best reduction performances.The optimum conditions of roasting reduction are the blast furnace dust dosage of 30%,the fluorite dosage of 10%and reduction at 1250 C for 60 min.The reduction iron powder,with 91.28%Fe grade,0.93%TiO content and 89.19%total iron recovery including iron in the run-of-mine and blast furnace dust,is obtained after the roasted product is processed by using a process of two-staged grinding and two-staged magnetic separation. KEY WORDS titanomagnetite:blast furnace dust:direct reduction:roasting:magnetic separation 收稿日期:201507-27 基金项目:国家自然科学基金资助项目(51474018)工程科学学报,第 38 卷,第 5 期: 609--616,2016 年 5 月 Chinese Journal of Engineering,Vol. 38,No. 5: 609--616,May 2016 DOI: 10. 13374 /j. issn2095--9389. 2016. 05. 003; http: / /journals. ustb. edu. cn 高炉灰为还原剂对海滨钛磁铁矿直接还原焙烧磁选-- 钛铁分离的影响 胡天洋1,2) ,孙体昌1,2) ,寇 珏1,2) ,耿 超1,2) ,高恩霞1,2) 1) 北京科技大学土木与环境工程学院,北京 100083 2) 北京科技大学金属矿山高效开采与安全教育部重点实验室,北京 100083  通信作者,E-mail: suntc@ ces. ustb. edu. cn 摘 要 对高炉灰在直接还原焙烧--弱磁选工艺中用作印尼某海滨钛磁铁矿还原剂的可行性及其机理进行研究. 结果表明, 以萤石为添加剂的条件下,高炉灰可代替煤做还原剂,通过高炉灰与萤石的共同作用,可以在直接还原过程中提高还原铁粉 中铁的回收率及品位并降低 TiO2质量分数,同时回收高炉灰中铁. 三种不同产地高炉灰还原效果的比较表明,高炉灰性质对 还原效果有影响. 在相同用量条件下,津鑫高炉灰( JX) 还原效果最好; 在 JX 高炉灰用量 30% 、萤石用量 10% 、焙烧温度 1250 ℃以及焙烧时间为 60 min 时,焙烧产物通过两段磨矿和两段磁选,最终得到最佳的还原铁粉中铁品位为 91. 28% ,TiO2质 量分数降至 0. 93% ,包括海滨砂矿和高炉灰中铁的铁总回收率达到 89. 19% . 关键词 钛磁铁矿; 高炉灰; 直接还原; 焙烧; 磁分离 分类号 TF556; TD951 Effect of blast furnace dust as a reductant on direct reduction roasting for separating titanium and iron in seaside titanomagnetite HU Tian-yang1,2) ,SUN Ti-chang1,2)  ,KOU Jue 1,2) ,GENG Chao 1,2) ,GAO En-xia1,2) 1) School of Civil and Environmental Engineering,University of Science and Technology Beijing,Beijing 100083,China 2) Key Laboratory of the Ministry of Education for Efficient Mining and Safety of Metal Mines,University of Science and Technology Beijing,Beijing 100083,China  Corresponding author,E-mail: suntc@ ces. ustb. edu. cn 收稿日期: 2015--07--27 基金项目: 国家自然科学基金资助项目( 51474018) ABSTRACT The feasibility and mechanisms of using the blast furnace dust as a reductant in direct reduction--low intensity magnetic separation of Indonesian seaside titanomagnetite were investigated. The results show that the blast furnace dust can be used as an alter￾native to coal as a reductant under the condition of fluorite as an additive. Under the synergistic effect of the blast furnace dust and flu￾orite,the recovery and grade of iron in the reduction iron powder can be increased and the content of TiO2 can be decreased at the same time during the direct reduction process. Simultaneously,iron in the blast furnace dust can also be recovered. A comparison of three different kinds of blast furnace dusts indicates that the composition of the blast furnace dust can influence the effect of reduction. Under the same dust dosage,the Jinxin blast furnace dust ( referred to as JX) show the best reduction performances. The optimum conditions of roasting reduction are the blast furnace dust dosage of 30% ,the fluorite dosage of 10% and reduction at 1250 ℃ for 60 min. The reduction iron powder,with 91. 28% Fe grade,0. 93% TiO2 content and 89. 19% total iron recovery including iron in the run-of-mine and blast furnace dust,is obtained after the roasted product is processed by using a process of two-staged grinding and two-staged magnetic separation. KEY WORDS titanomagnetite; blast furnace dust; direct reduction; roasting; magnetic separation
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