工程科学学报,第38卷,第2期:181-186,2016年2月 Chinese Journal of Engineering,Vol.38,No.2:181-186,February 2016 DOI:10.13374/j.issn2095-9389.2016.02.004:http://journals.ustb.edu.cn 海砂矿深度还原一磁选分离实验研究 刘依然”,张建良)四,王振阳”,刘征建”,邢相栋) 1)北京科技大学治金与生态工程学院,北京1000832)西安建筑科技大学治金工程学院,西安710055 ☒通信作者,E-mail:zhang.jianliang@hotmail..com 摘要应用化学分析、扫描电镜观察和X射线衍射分析方法研究海砂矿的基础物性.采用煤基深度还原一磁选工艺,系统 考察矿粉中F和T的还原分离行为,并明确还原温度、还原时间、碳氧比、磁感应强度和磨矿粒度对还原磁选效果的影响规 律.结果表明:海砂矿主要由钛磁铁矿和钛赤铁矿组成:较优的还原分离工艺参数为还原温度1300℃、还原时间30mi、碳氧 摩尔比1.1、磁感应强度50mT和磨矿细度-0.074mm质量分数86.34%.在此工艺条件下,可以获得金属化率94.23%的还 原产物,磁选指标分别达到精矿铁品位97.19%和尾矿钛品位57.94%,对应的铁、钛回收率为90.28%和87.22%,有效地实 现海砂矿中铁钛元素的分离富集. 关键词海砂矿:铁矿石还原:磁选分离:精矿铁 分类号TF046 Experimental research on the deep reduction-magnetic separation of ironsand LIU Yi-ran,ZHANG Jian-liang,WANG Zhen-yang,LIU Zheng jian),XING Xiang-dong? 1)School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China 2)School of Metallurgical Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China Corresponding author,E-mail:zhang.jianliang@hotmail.com ABSTRACT The basic characteristics of ironsand were systematically studied by chemical analysis,scanning electron microscopy and X-ray diffraction.A series of experiments were performed to investigate reduction-magnetic separation for Fe and Ti from iron- sand.The effects of reduction temperature,reduction time,carbon ratio,magnetic density,and grinding fineness on the reduction- magnetic separation process were investigated.It could be found that the ironsand mainly consisted of titanomagnetite and titanohema- tite.The optimal process parameters were obtained as follows:reduction temperature,1300 C:reduction time,30 min:C/O molar ratio,1.1;magnetic density,50 mT:and the grinding fineness of-0.074 um,86.34%.Under such conditions,the metallization rate,the iron grade of magnetic substance and the iron recovery reached to 94.23%,97.19%and 90.28%,respectively,and the titanium grade of non-magnetic substance and the titanium recovery were 57.94%and 87.22%,respectively.The effective separation of iron and titanium could be achieved in this reduction-magnetic separation process. KEY WORDS ironsand;iron ore reduction;magnetic separation:iron concentrate 海砂矿储存量大,价格低廉,来源广泛,但是由于 学者做了大量的研究工作,Longbottom等5研究固态 其铁品位较低,K,0、Na,0及TO2含量较高,多种元素 碳热还原海砂矿的影响因素,分析海砂矿在还原过程 共生复杂嵌布,粒度较粗,结构致密,硬度、熔点较高等 中的物相转变过程,并得出压块中黏结相的形成与压 原因致使选矿和治炼极其困难而无法大量开发利 块强度的提高主要受还原温度的影响的结论.目前, 用.为了实现海砂矿的高效综合利用,国内外相关 对于多金属共生矿较多采用细筛一再磨工艺、高梯度 收稿日期:2014-1-12 基金项目:国家重点基础研究发展计划资助项目(2012CB720400)工程科学学报,第 38 卷,第 2 期: 181--186,2016 年 2 月 Chinese Journal of Engineering,Vol. 38,No. 2: 181--186,February 2016 DOI: 10. 13374 /j. issn2095--9389. 2016. 02. 004; http: / /journals. ustb. edu. cn 海砂矿深度还原--磁选分离实验研究 刘依然1) ,张建良1) ,王振阳1) ,刘征建1) ,邢相栋2) 1) 北京科技大学冶金与生态工程学院,北京 100083 2) 西安建筑科技大学冶金工程学院,西安 710055 通信作者,E-mail: zhang. jianliang@ hotmail. com 摘 要 应用化学分析、扫描电镜观察和 X 射线衍射分析方法研究海砂矿的基础物性. 采用煤基深度还原--磁选工艺,系统 考察矿粉中 Fe 和 Ti 的还原分离行为,并明确还原温度、还原时间、碳氧比、磁感应强度和磨矿粒度对还原磁选效果的影响规 律. 结果表明: 海砂矿主要由钛磁铁矿和钛赤铁矿组成; 较优的还原分离工艺参数为还原温度 1300 ℃、还原时间 30 min、碳氧 摩尔比 1. 1、磁感应强度 50 mT 和磨矿细度 - 0. 074 mm 质量分数 86. 34% . 在此工艺条件下,可以获得金属化率 94. 23% 的还 原产物,磁选指标分别达到精矿铁品位 97. 19% 和尾矿钛品位 57. 94% ,对应的铁、钛回收率为 90. 28% 和 87. 22% ,有效地实 现海砂矿中铁钛元素的分离富集. 关键词 海砂矿; 铁矿石还原; 磁选分离; 精矿铁 分类号 TF046 Experimental research on the deep reduction--magnetic separation of ironsand LIU Yi-ran1) ,ZHANG Jian-liang1) ,WANG Zhen-yang1) ,LIU Zheng-jian1) ,XING Xiang-dong2) 1) School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China 2) School of Metallurgical Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China Corresponding author,E-mail: zhang. jianliang@ hotmail. com ABSTRACT The basic characteristics of ironsand were systematically studied by chemical analysis,scanning electron microscopy and X-ray diffraction. A series of experiments were performed to investigate reduction--magnetic separation for Fe and Ti from ironsand. The effects of reduction temperature,reduction time,carbon ratio,magnetic density,and grinding fineness on the reductionmagnetic separation process were investigated. It could be found that the ironsand mainly consisted of titanomagnetite and titanohematite. The optimal process parameters were obtained as follows: reduction temperature,1300 ℃ ; reduction time,30 min; C/O molar ratio,1. 1; magnetic density,50 mT; and the grinding fineness of - 0. 074 μm,86. 34% . Under such conditions,the metallization rate,the iron grade of magnetic substance and the iron recovery reached to 94. 23% ,97. 19% and 90. 28% ,respectively,and the titanium grade of non-magnetic substance and the titanium recovery were 57. 94% and 87. 22% ,respectively. The effective separation of iron and titanium could be achieved in this reduction--magnetic separation process. KEY WORDS ironsand; iron ore reduction; magnetic separation; iron concentrate 收稿日期: 2014--11--12 基金项目: 国家重点基础研究发展计划资助项目( 2012CB720400) 海砂矿储存量大,价格低廉,来源广泛,但是由于 其铁品位较低,K2O、Na2O 及 TiO2含量较高,多种元素 共生复杂嵌布,粒度较粗,结构致密,硬度、熔点较高等 原因致使选矿和冶炼极其困难而无法大量开发利 用[1--4]. 为了实现海砂矿的高效综合利用,国内外相关 学者做了大量的研究工作,Longbottom 等[5--6]研究固态 碳热还原海砂矿的影响因素,分析海砂矿在还原过程 中的物相转变过程,并得出压块中黏结相的形成与压 块强度的提高主要受还原温度的影响的结论. 目前, 对于多金属共生矿较多采用细筛--再磨工艺、高梯度