工程科学学报2016，Vol.38Issue(7)：920-929,10.DOI:10.13374/j.issn2095-9389.2016.07.005
高钛球团焙烧行为及其强化技术
Roasting behavior and enhancing technology of high-titanium pellets
摘要
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 condu-cive to the diffusion of recrystallization and then facilitate the growth of titanium hematite grains and the enrichment of Ti in Fe2 TiO5 . As a consequence, the proper preheating time shortens to 16 min and the pellet strength increases to 2141 N per pellet for pellets con-tainling 21% of TiO2 .关键词
钒钛磁铁矿/氧化焙烧/球团/二氧化钛Key words
vanadium-titannium magnetite/oxidation roasting/pelletizing/titanium dioxide分类
矿业与冶金引用本文复制引用
陈许玲,刘树,甘敏,范晓慧..高钛球团焙烧行为及其强化技术[J].工程科学学报,2016,38(7):920-929,10.基金项目
国家自然科学基金资助项目(51474237) （51474237）
中国博士后科学基金特别资助项目(2014T70691) （2014T70691）
