工程科学学报,第37卷,第10期:1268-1275,2015年10月 Chinese Journal of Engineering,Vol.37,No.10:1268-1275,October 2015 DOI:10.13374/j.issn2095-9389.2015.10.003;http://journals.ustb.edu.cn 含铁硅酸盐矿物重构与选择性回收 鞠会霞2》,胡文韬区,刘欣伟》,黄晓燕”,杨海波》,孙体昌” 1)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 2)莱芜钢铁集团鲁南矿业有限公司,临沂276400 3)中国科学院过程工程研究所多项复杂系统国家重点实验室,北京100190 ☒通信作者,E-mail:huwentad010@126.com 摘要回收含铁硅酸盐矿物是实现鞍山式贫磁铁矿再选中矿综合利用的关键之一,但这一回收过程应有选择性:一段磁选 尾渣T℉e仅为3.92%,不予以回收:而二段尾渣T℉e为34.51%,可将其返回直接还原配料,予以间接回收。还原温度1150 ℃、还原时间45min、石灰石用量16%以及还原煤用量12%时,闭路实验获得的最优粉末铁TFe为92.69%,εFe为91.17%。 含铁硅酸盐中铁元素被还原为单质铁,硅元素最终重构为硅灰石。 关键词硅酸盐矿物:重构:直接还原:选择性回收:铁 分类号TD98 Reengineering and selective recovery of iron-bearing silicate minerals JU Hui-xia,HU Wen-tao,LIU Xin-wei,HUANG Xiao-yan,YANG Hai-bo,SUN Ti-chang 1)State Key Laboratory of High-Efficient Mining and Safety of Metal Mines(Ministry of Education),University of Science and Technology Beijing,Bei- jing 100083,China 2)Laiwu Iron and Steel Group,Lunan Mining Co.,LTD,Linyi 276400,China 3)State Key Laboratory of Multiphase Complex Systems State,Institute of Process Engineering,Chinese Academy of Sciences (IPE-CAS),Beijing 100190,China Corresponding author,E-mail:huwentao010@126.com ABSTRACT The recovery of iron-bearing silicate minerals is a key on the re-separation middlings of Anshan type lean magnetite, but this recovery process should be conducted selectively.The iron grade of stage I tailing is only 3.92%,so there is no need to re- cover it.However,the iron grade of stage 2 tailing is 34.51%,thus this tailing can be returned to the mixing process before direct re- duction and its iron is indirectly recovered.Under the condition of the direct reduction temperature of 1150 C,the direct reduction time of 45 min,the limestone dosage of 16%and the coal dosage of 12%,the optimum TFe and sFe obtained from closed-eircuit ex- periment is 92.69%and 91.17%.Iron and silicon in the iron-bearing silicate are reduced to elemental iron and reengineered to aedelforsite,respectively. KEY WORDS silicate minerals;reengineering:direct reduction:selective recovery:iron 鞍山式贫磁铁矿-储量大,分布集中,是最重要磁铁矿磁选尾矿再磨再选工艺研究B-,在回收铁精 的铁矿石类型之一。分选此类矿石产生的尾矿量大,矿的同时减少尾矿排放。再选工艺产生的中矿品位较 品位高,若直接排放,既浪费资源又占用土地,还容易低,很难直接利用,目前主要靠反浮选富集。直接 产生二次污染。近年来,国内外开展了大量鞍山式贫还原技术是近几年难选治含铁矿物综合利用领域围 收稿日期:201506-04 基金项目:国家自然科学基金资助项目(51304012):中国博士后科学基金资助项目(2014M550845):钢铁治金新技术国家重点实验室开放基 金资助项目(KF1304,KF13-05)工程科学学报,第 37 卷,第 10 期: 1268--1275,2015 年 10 月 Chinese Journal of Engineering,Vol. 37,No. 10: 1268--1275,October 2015 DOI: 10. 13374 /j. issn2095--9389. 2015. 10. 003; http: / /journals. ustb. edu. cn 含铁硅酸盐矿物重构与选择性回收 鞠会霞1,2) ,胡文韬1) ,刘欣伟1,3) ,黄晓燕1) ,杨海波2) ,孙体昌1) 1) 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 2) 莱芜钢铁集团鲁南矿业有限公司,临沂 276400 3) 中国科学院过程工程研究所多项复杂系统国家重点实验室,北京 100190 通信作者,E-mail: huwentao010@ 126. com 摘 要 回收含铁硅酸盐矿物是实现鞍山式贫磁铁矿再选中矿综合利用的关键之一,但这一回收过程应有选择性: 一段磁选 尾渣 TFe 仅为 3. 92% ,不予以回收; 而二段尾渣 TFe 为 34. 51% ,可将其返回直接还原配料,予以间接回收。还原温度 1150 ℃、还原时间 45 min、石灰石用量 16% 以及还原煤用量 12% 时,闭路实验获得的最优粉末铁 TFe 为 92. 69% ,εFe 为 91. 17% 。 含铁硅酸盐中铁元素被还原为单质铁,硅元素最终重构为硅灰石。 关键词 硅酸盐矿物; 重构; 直接还原; 选择性回收; 铁 分类号 TD98 Reengineering and selective recovery of iron-bearing silicate minerals JU Hui-xia1,2) ,HU Wen-tao 1) ,LIU Xin-wei 1,3) ,HUANG Xiao-yan1) ,YANG Hai-bo 2) ,SUN Ti-chang1) 1) State Key Laboratory of High-Efficient Mining and Safety of Metal Mines( Ministry of Education) ,University of Science and Technology Beijing,Beijing 100083,China 2) Laiwu Iron and Steel Group,Lunan Mining Co. ,LTD,Linyi 276400,China 3) State Key Laboratory of Multiphase Complex Systems State,Institute of Process Engineering,Chinese Academy of Sciences ( IPE-CAS) ,Beijing 100190,China Corresponding author,E-mail: huwentao010@ 126. com ABSTRACT The recovery of iron-bearing silicate minerals is a key on the re-separation middlings of Anshan type lean magnetite, but this recovery process should be conducted selectively. The iron grade of stage 1 tailing is only 3. 92% ,so there is no need to recover it. However,the iron grade of stage 2 tailing is 34. 51% ,thus this tailing can be returned to the mixing process before direct reduction and its iron is indirectly recovered. Under the condition of the direct reduction temperature of 1150 ℃,the direct reduction time of 45 min,the limestone dosage of 16% and the coal dosage of 12% ,the optimum TFe and εFe obtained from closed-circuit experiment is 92. 69% and 91. 17% . Iron and silicon in the iron-bearing silicate are reduced to elemental iron and reengineered to aedelforsite,respectively. KEY WORDS silicate minerals; reengineering; direct reduction; selective recovery; iron 收稿日期: 2015--06--04 基金项目: 国家自然科学基金资助项目( 51304012) ; 中国博士后科学基金资助项目( 2014M550845) ; 钢铁冶金新技术国家重点实验室开放基 金资助项目( KF 13--04,KF 13--05) 鞍山式贫磁铁矿[1--2]储量大,分布集中,是最重要 的铁矿石类型之一。分选此类矿石产生的尾矿量大, 品位高,若直接排放,既浪费资源又占用土地,还容易 产生二次污染。近年来,国内外开展了大量鞍山式贫 磁铁矿磁选尾矿再磨再选工艺研究[3--6],在回收铁精 矿的同时减少尾矿排放。再选工艺产生的中矿品位较 低,很难直接利用,目前主要靠反浮选富集[7--8]。直接 还原技术是近几年难选冶含铁矿物综合利用领域[9--13]