鄂西高磷鲕状赤铁矿直接还原焙烧同步脱磷机理  

Dephosphorization mechanism in a roasting process for direct reduction of high-phosphorus oolitic hematite in west Hubei Province,China

作　　者：杨大伟[1] 孙体昌[1] 杨慧芬[1] 徐承焱[1] 祁超英[2] 李志祥[2] 

机构地区：[1]北京科技大学金属矿山高效开采与安全教育部重点实验室,北京100083 [2]武汉钢铁集团矿业有限责任公司,武汉430080

出　　处：《北京科技大学学报》2010年第8期968-974,共7页Journal of University of Science and Technology Beijing

基　　金："十一五"国家科技支撑计划资助项目(No.2007BAB15B01)

摘　　要：采用XRD和SEM分析方法研究了鄂西高磷鲕状赤铁矿添加脱磷剂后直接还原焙烧的产物及磁选后的最终产品.结果表明,还原焙烧过程中添加的脱磷剂除具有脱磷效果外,对铁的还原也有促进作用.脱磷剂可以使部分磷转化为易去除的可溶性磷酸盐,同时破坏鲕粒结构,使细磨-磁选后铁相易与脉石矿物分离从而达到脱磷效果,并且可以提高产品中铁的品位和回收率.Direct reduction-roasted products and final products after magnetic separation, which are reduced from high-phosphorus oolitic hematite in west Hubei Province of China by adding a dephosphorization agent, were investigated by XRD and SEM. The results show that the dephosphorization agent added in the reduction-roasting process can remove phosphorus and promote iron reduction. The dephosphorization agent not only transforms partial phosphorus ores into easy removed solvable phosphate but also breaks the oolitic structure, leading to an easy separation of iron from gangue after fine grinding and magnetic separation in order to remove phosphorus. The grade and recovery of iron also improve due to adding the dephosphorization agent.

关 键 词：赤铁矿 直接还原 焙烧 脱磷 

分 类 号：TD951[矿业工程—选矿] TF556[冶金工程—钢铁冶金]