硫铁矿烧渣制取海绵铁的工艺研究  

A study on Techniques of Producing Sponge Iron from Pyrite Cinder

作　　者：龚竹青[1] 龚胜[1] 周波[2] 陈白珍[1] 

机构地区：[1]中南大学冶金科学与工程学院,湖南长沙410083 [2]广西大学资源与环境工程学院,广西南宁530004

出　　处：《矿冶工程》2006年第1期45-48,55,共5页Mining and Metallurgical Engineering

摘　　要：硫铁矿烧渣是生产硫酸排出的废渣，其主要成分为铁的氧化物，是很好的铁资源。进行了硫铁矿烧渣制取海绵铁的工艺研究，表明采用无烟煤还原烧渣，CaCO3是良好的脱硫剂和固体C气化的促进剂，采用同心环装料方式在980～1000℃，焙烧4-4.5h，可使铁的金属化率达到94％以上，产品经过湿式磁选，可使金属化率和总铁品位分别提高2％-3％，铁的总回收率达95％以上，磁选后主要杂质Si、Al、S、P、Ca、Mg等都大大降低。该工艺是综合利用硫铁矿烧渣的又一有效途径。Pyrite cinder, residue from production sulfuric acid, has ferric oxide as its primary component and is a good resource of iron. A study was made on the techniques of producing sponge iron from pyrite cinder. It indicated that in the reduction of the cinder by anthracite, calcium carbonate was a good desulfurizing agent and a good accelerant for gasification of solid carbon. By charging with concentric ring and roasting at the temperature of 980 - 1 000℃ for 4 - 4.5 hours, the percent metallization of iron could reach above 94%. After wet magnetic separation of the product, the percent metallization and the total iron content could increase by 2 % - 3 %, respectively, and the total recovery of iron could reach above 95 %. The contents of main impurities such as Si, Al, S, P, Ca and Mg greatly decreased after the magnetic separation. Thus, this technique is a new effective approach of comprehensive utilization of pyrite cinders.

关 键 词：硫铁矿烧渣 海绵铁 金属化率 脱S剂 

分 类 号：TF111.1[冶金工程—冶金物理化学]