钙盐在硫酸渣直接还原同步脱硫中的作用及机理  

Desulfurization mechanism of calcium salts in direct reduction roasting of pyrite cinder

作　　者：孙昊[1] 孙体昌[1] 高恩霞[1] 刘占华[1] 许言[1] 

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

出　　处：《北京科技大学学报》2013年第8期977-985,共9页Journal of University of Science and Technology Beijing

摘　　要：研究了不同种类还原剂和钙盐脱硫剂组合对硫酸渣直接还原焙烧同步脱硫效果的影响.利用X射线衍射和扫描电镜对不同组合条件下所得焙烧矿进行了分析.硫酸渣中的黄铁矿和镁橄榄石与不同种类的钙盐脱硫剂在高温还原气氛中发生反应,生成金属铁和种类不同的含硫矿物硫化钙或硫硅钙石,通过磨矿-磁选的方法将金属铁与含硫矿物分离,从而达到一定的脱硫效果.不同还原剂和脱硫剂组合所得焙烧矿中含硫矿物存在状态不同,而且与金属铁之间的嵌布关系也不同.This paper reports the influence of different combinations of reductants and calcium salt desulfurizers on desulfurization of pyrite cinder in direct reduction roasting process. The roasted ore obtained at different conditions was analyzed by X-ray diffraction and scanning electron microscopy. It is found that pyrite and forsterite in pyrite cinder react with different kinds of calcium salt desulfurizers in the high-temperature and reducing atmosphere to form metallic iron and different sulfur-bearing minerals, calcium sulfide or jasmundite. The sulfur-bearing minerals can be removed from the roasted ore through grinding and magnetic separation, thereby reducing the sulfur content. Different intergrowths between sulfur minerals and metallic iron in the roasted ore formed by different combinations of reductants and calcium salt desulfurizers make the contents of iron and sulfur in direct reduction iron have different change laws. With different combinations of reductants and desulfurizers, the sulfur minerals and their intergrowth with metallic iron in the roasted ore are also different.

关 键 词：硫酸渣 直接还原 矿石焙烧 钙化合物 脱硫 

分 类 号：TF046[冶金工程—冶金物理化学]