工程科学学报，第38卷，第7期：920929,2016年7月 Chinese Journal of Engineering,Vol.38,No.7:920-929,July 2016 DOI:10.13374/j.issn2095-9389.2016.07.005:http://journals.ustb.edu.cn 高钛球团焙烧行为及其强化技术 陈许玲，刘树，甘敏四，范晓慧 中南大学资源加工与生物工程学院，长沙410083 ☒通信作者，E-mail:ganminhao@126.com 摘要研究了高钛球团的焙烧特征和固结行为.随着T02含量的增加，球团焙烧难度增大，当T0,质量分数由10%增加 至21%时，高钛球团所需预热时间由12min延长至26min以上，培烧球强度由每个2486N降低至每个1728N.高钛球团由于 FT0,含量高，导致氧化速度慢、预热球氧化程度低，不利于培烧固结时钛赤铁矿固溶体晶粒的长大，使得球团固结强度差. 通过添加NOH结合润磨工艺增大颗粒表面能和反应活性，促进了固相扩散，并生成少量低熔点化合物，有利于再结晶过程 的扩散迁移，使Ti富集在Fe2TiO,中并促进钛赤铁矿晶粒长大，强化了高钛球团焙烧固结，可使预热时间缩短至l6min,球团 强度提高至每个2141N. 关键词钒钛磁铁矿：氧化培烧：球团：二氧化钛 分类号TF046 Roasting behavior and enhancing technology of high-titanium pellets CHEN Xu-ling,LIU Shu,GAN Min,FAN Xiao-hui School of Minerals Processing Bioengineering,Central South University,Changsha 410083,China Corresponding author,E-mail:ganminhao@126.com ABSTRACT The roasting properties and solidification behaviors of high-titanium pellets were studied systematically in this paper. The results show that increasing the content of TiO in pellets can lead to a greater difficulty in their roasting process.When the con- tent of TiO,increases from 10%to 21%,the proper preheating time prolongs from 12 min to more than 26 min,while the strength of roasted pellets still decrease from 2486 N to 1728 N per pellet.The reason is that high-titanium pellets contain high content of FeTiO,, which leads to a lower oxidization velocity of magnetite and a lower pre-oxidization degree.This phenonmenon is further adverse to the growth and connection of haplotypite crystals,which finally worsen the consolidation strength of pellets.By simultaneously adding NaOH and applying the wet-grinding process,the surface energy and surface activity of ore particles increase,which contribute to im- proving the diffusion of solid phases and generating a small amount of low-melting-point compounds.These improvements are conducive to the diffusion of recrystallization and then facilitate the growth of titanium hematite grains and the enrichment of Ti in Fe,TiOs.As a consequence,the proper preheating time shortens to 16min and the pellet strength increases to 2141 N per pellet for pellets containling 21%ofTi02. KEY WORDS vanadium-titannium magnetite:oxidation roasting:pelletizing:titanium dioxide 钒钛磁铁矿是一种以铁、钒和钛为主，伴生铬、钴、要用于高炉冶炼和高炉护炉-可.目前，含钛氧化球团 镍、铜、钪、镓、铂等有价元素的复合矿产资源，具有很矿T02质量分数一般不超过13%，铁品位53%~ 高的综合利用价值·.经过选矿所得的钒钛磁铁精 54%,而对于一些炉体严重受损的高炉来说，其护炉任 矿，通过球团工艺制备成具有一定粒度的球团矿后，主 务重，需加入较多的护炉球团，但这会降低入炉炉料的 收稿日期：201507-19 基金项目：国家自然科学基金资助项目(51474237)：中国博士后科学基金特别资助项目(2014T70691)工程科学学报，第 38 卷，第 7 期: 920--929，2016 年 7 月 Chinese Journal of Engineering，Vol． 38，No． 7: 920--929，July 2016 DOI: 10． 13374 /j． issn2095--9389． 2016． 07． 005; http: / /journals． ustb． edu． cn 高钛球团焙烧行为及其强化技术 陈许玲，刘 树，甘 敏，范晓慧 中南大学资源加工与生物工程学院，长沙 410083  通信作者，E-mail: ganminhao@ 126． com 摘 要 研究了高钛球团的焙烧特征和固结行为． 随着 TiO2 含量的增加，球团焙烧难度增大，当 TiO2 质量分数由 10% 增加 至 21% 时，高钛球团所需预热时间由 12 min 延长至 26 min 以上，焙烧球强度由每个 2486 N 降低至每个 1728 N． 高钛球团由于 FeTiO3 含量高，导致氧化速度慢、预热球氧化程度低，不利于焙烧固结时钛赤铁矿固溶体晶粒的长大，使得球团固结强度差． 通过添加 NaOH 结合润磨工艺增大颗粒表面能和反应活性，促进了固相扩散，并生成少量低熔点化合物，有利于再结晶过程 的扩散迁移，使 Ti 富集在 Fe2TiO5 中并促进钛赤铁矿晶粒长大，强化了高钛球团焙烧固结，可使预热时间缩短至 16 min，球团 强度提高至每个 2141 N． 关键词 钒钛磁铁矿; 氧化焙烧; 球团; 二氧化钛 分类号 TF046 Ｒoasting behavior and enhancing technology of high-titanium pellets CHEN Xu-ling，LIU Shu，GAN Min ，FAN Xiao-hui School of Minerals Processing ＆ Bioengineering，Central South University，Changsha 410083，China  Corresponding author，E-mail: ganminhao@ 126． com ABSTＲACT The roasting properties and solidification behaviors of high-titanium pellets were studied systematically in this paper． The results show that increasing the content of TiO2 in pellets can lead to a greater difficulty in their roasting process． When the con￾tent of TiO2 increases from 10% to 21% ，the proper preheating time prolongs from 12 min to more than 26 min，while the strength of roasted pellets still decrease from 2486 N to 1728 N per pellet． The reason is that high-titanium pellets contain high content of FeTiO3， which leads to a lower oxidization velocity of magnetite and a lower pre-oxidization degree． This phenonmenon is further adverse to the growth and connection of haplotypite crystals，which finally worsen the consolidation strength of pellets． By simultaneously adding NaOH and applying the wet-grinding process，the surface energy and surface activity of ore particles increase，which contribute to im￾proving the diffusion of solid phases and generating a small amount of low-melting-point compounds． These improvements are conducive to the diffusion of recrystallization and then facilitate the growth of titanium hematite grains and the enrichment of Ti in Fe2TiO5 ． As a consequence，the proper preheating time shortens to 16 min and the pellet strength increases to 2141 N per pellet for pellets containling 21% of TiO2 ． KEY WOＲDS vanadium--titannium magnetite; oxidation roasting; pelletizing; titanium dioxide 收稿日期: 2015--07--19 基金项目: 国家自然科学基金资助项目( 51474237) ; 中国博士后科学基金特别资助项目( 2014T70691) 钒钛磁铁矿是一种以铁、钒和钛为主，伴生铬、钴、 镍、铜、钪、镓、铂等有价元素的复合矿产资源，具有很 高的综合利用价值［1--3］． 经过选矿所得的钒钛磁铁精 矿，通过球团工艺制备成具有一定粒度的球团矿后，主 要用于高炉冶炼和高炉护炉［4--7］． 目前，含钛氧化球团 矿 TiO2 质量 分 数 一 般 不 超 过 13% ，铁 品 位 53% ～ 54% ，而对于一些炉体严重受损的高炉来说，其护炉任 务重，需加入较多的护炉球团，但这会降低入炉炉料的