中南大学学报（自然科学版）2016，Vol.47Issue(5)：1465-1472,8.DOI:10.11817/j.issn.1672-7207.2016.05.002
高压辊磨强化高镁磁铁矿球团工艺及机理
Strengthening in processing and mechanism of magnetite with high MgO content pellet by high pressure grinding roller
摘要
Abstract
The processing and mechanism of strengthening in pelletization of magnetite concentrate with high MgO content which exists in the Fe3O4lattice as isomorphism by high pressure grinding roller were investigated.The results show that after pretreatment three times by high pressure roll grinding, the specific surface area of magnetite concentrate increasesfrom 669 to 1560 cm2/g,andthe dosage of bentonite decreasesfrom 1.5% to 0.7%. Indexes of green balls are much higher thanthat ofthose pellets made of feed without the pretreatment, the compressive strength of green ball is 26.06 N per pellet and the drop number is 10.5 times from the 0.5minheight,butthe thermal shock temperature of green ball reducesto 405℃. The compressive strength of fired pellets increasesfrom 1899N to 3035N.During the firing process, there are large numbers of solid solutions containing FeO and MgO which produce skeleton crystal that reduce the strength of pellets. Pretreatment byhigh pressure roller grinding promotesthe development of hematite and recrystallization, and as the result the size of hematite crystal in the pellets getsbigger it interconnectsinto pieces and wrapsthis kind of solid solutions,thusmakingup the structure defects and strengthensthe connection of pellets.关键词
高镁磁铁矿/高压辊磨/预处理/氧化球团/抗压强度Key words
magnetite with high MgO content/high pressure roller grinding/pretreatment/oxidized pellets/compressive strength分类
矿业与冶金引用本文复制引用
于鸿宾,潘建,朱德庆,廖金能..高压辊磨强化高镁磁铁矿球团工艺及机理[J].中南大学学报（自然科学版）,2016,47(5):1465-1472,8.基金项目
国家科技部火炬计划项目(2011GH561685)；国家自然科学基金资助项目(51474161)(Project(2011GH561685)supported by“Torch plan”ofMinistry of Science and Technology （2011GH561685）
Project(51474161)supportedbythe NationalNatural Science Foundation of China) （51474161）
