煤种对高磷鲕状赤铁矿直接还原同步脱磷的影响  

Effects of Coal Types on Direct Reduction and Dephosphorization Synchronously of High-phosphorus Oolitic Hematite

作　　者：徐承焱[1] 孙体昌[1] 祁超英[2] 杨慧芬[1] 李永利[1] 莫晓兰[1] 李志祥[2] 

机构地区：[1]北京科技大学 [2]武汉钢铁集团矿业有限责任公司

出　　处：《金属矿山》2010年第8期46-50,共5页Metal Mine

基　　金：“十一五”国家科技支撑计划项目(编号:2007BAB15B01)

摘　　要：以3种烟煤、1种无烟煤和1种褐煤为还原剂,配合SY1与SY2按2∶1质量比配成的脱磷剂,采用直接还原焙烧—磁选工艺,研究煤种对鄂西高磷鲕状赤铁矿直接还原同步脱磷的影响。结果表明：煤中的固定碳、挥发分有利于提高所得还原铁产品的铁品位和铁回收率,灰分对降低还原铁磷含量不利;增加煤用量和增加脱磷剂用量都能提高直接还原同步降磷的效果,但前者所需成本比后者低;在合适的煤用量和脱磷剂用量下,5种煤都可以得到铁品位大于90%,磷含量小于0.1%的还原铁,相比较而言,褐煤直接还原同步脱磷的效果较好,其次为无烟煤,烟煤较差。Taking three types of bituminous,one anthracite,one lignite as reductants,and with the mixture of SY1 and SY2（mass ratio of SY1/SY2=2∶1）,the effects of coal types on direct reduction and dephosphorization synchronously were studied by the direct reduction roasting-magnetic separation process.The results showed that the fixed carbon and volatile in the coals were beneficial to improving the grade and recovery of iron in the DRI（Direct Reduced Iron） with different kinds of coal as reductants,the ash was disadvantageous to decrease the phosphorus content of the DRI.The effects of direct reduction and dephosphorization synchronously can be obtained by increasing the amount of different types of coal（dephosphorization agent）in a fixed dosage of dephosphorization agent（the optimum dosage of different types of coal.But the former needs lower costs than the later.Using five types of coal as reductants,DRI containing Fe more than 90%,P less than 0.1% were obtained at the appropriate amount of coal and dephosphorization agent.In comparison,a good effect can be achieved by the direct reduction and dephosphorization synchronously with lignite,secondly anthracite,poorly bituminous.

关 键 词：高磷鲕状赤铁矿 直接还原 同步脱磷 煤种 脱磷剂 

分 类 号：TQ624[化学工程—精细化工]