工程科学学报2016，Vol.38Issue(10)：1369-1376,8.DOI:10.13374/j.issn2095-9389.2016.10.004
铬铁矿球团焙烧固结特性
Oxidation consolidation characteristics of chromite pellets during the roasting process
摘要
Abstract
The roasting consolidation characteristics of chromite pellets were systematically studied in this paper. The results show that preheating time has little effect on the compressive strength of preheating chromite pellets. Under the appropriate preheating time of 10 min, increasing the preheating temperature can improve the compressive strength and oxidation rate of preheating chromite pellets linearly. The appropriate preheating temperature is 1050℃, at which the compressive strength of preheating chromite pellets can reach more than 400 N. In addition, compared with conventional iron ore pellets, a higher roasting temperature is required for chromite pel-lets. The compressive strength of chromite pellets increases from 1078 N to 1973 N when the roasting temperature increases from 1250℃ to 1350℃. During the preheating and roasting of chromite pellets, (Fe,Mg)(Cr,Fe,Al)2O4 is oxidized into (Fe,Mg)(Cr,Fe, Al) 2 O4 and ( Cr,Fe,Al) 2 O3 . The new phase ( Cr,Fe,Al) 2 O3 is obviously generated when the temperature surpasses 1000℃. ( Cr, Fe,Al) 2 O3 mainly distributes in the outer layer of the particles in a ring shape, while the acicular ( Cr,Fe,Al) 2 O3 interlaces together with ( Fe,Mg) ( Cr,Fe,Al) 2 O4 in the internal part. Decreasing the Cr/Fe ratio in the raw ore concentrate or increasing the roasting temperature can facilitate the aggregation of ( Cr,Fe,Al) 2 O3 around the outer layer of the particles, which in terms assists in the pellet consolidation and then enhances the compressive strength of chromite pellets.关键词
铬铁矿/球团/焙烧/氧化/固结Key words
chromite/ore pellets/roasting/oxidation/consolidation分类
矿业与冶金引用本文复制引用
甘敏,高露,范晓慧,陈许玲,田志远,周训伟..铬铁矿球团焙烧固结特性[J].工程科学学报,2016,38(10):1369-1376,8.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资助项目(2014T70691) （2014T70691）
湖南省战略金属矿产资源清洁高效利用协同创新中心资助项目 （）
中南大学“创新驱动计划”资助项目(2015CX005) （2015CX005）
