工程科学学报,第38卷,第7期:920929,2016年7 Chinese Journal of Engineering, Vol 38, No. 7: 920-929, July 2016 DOl:10.13374/j.isn2095-9389.2016.07.005;htp:// 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41008 区通信作者,E-mil: ganminhac@126 摘要研究了髙钛球团的焙烧特征和固结行为.随着TO2含量的增加,球团焙烧难度增大,当TO2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,焙烧球强度由每个2486N降低至每个1728N.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,使们i富集在Fe2TiO3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;氧化焙烧;球团;二氧化钛 分类号TF046 Roasting behavior and enhancing technology of high -titanium pellets CHEN XUHing, LIU Shu, GAN Min, FAN Xiao-hui School of Minerals Processing Bioengineering, Central South University, Changsha 410083,China 2 Corresponding author, E-mail: ganminhao( 126 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 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 2486N to 1728N 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 the diffusion of recrystallization and then facilitate the growth of titanium hematite grains and the enrichment of Ti in Fe, TiO,. As a consequence, the proper preheating time shortens to 16 min and the pellet strength increases to 2141N per pellet for pellets containning 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-.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TiO2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: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(2014170691)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