润磨强化硫酸渣制备氧化球团的技术及机理  

Enhancing technology and mechanism of oxidized pellet prepared from pyrite cinder by moisture grinding

作　　者：白国华[1] 周晓青[2] 范晓慧[1] 李建臣[1] 

机构地区：[1]中南大学资源加工与生物工程学院,湖南长沙410083 [2]中冶长天国际工程有限责任公司工艺分院,湖南长沙410007

出　　处：《中南大学学报（自然科学版）》2011年第6期1509-1515,共7页Journal of Central South University:Science and Technology

基　　金：新世纪优秀人才支持计划项目(NCET-05-0690)

摘　　要：从硫酸渣本身特点出发,对硫酸渣制备氧化球团的特点及润磨在球团制备过程中的作用机理进行研究。研究结果表明:无润磨的硫酸渣生球强度极差,水分较高,润磨可改善硫酸渣的粒度组成、比表面积,降低生球的孔隙率,从而有效降低膨润土用量,大幅提高生球的强度及降低生球的水分;润磨也能提高硫酸渣颗粒活性,增加颗粒与颗粒之间的接触点,使质点利于扩散,从而改善硫酸渣球团的焙烧性能,润磨后的球团在焙烧温度为1 150℃、焙烧时间为10 min的条件下,便可获得抗压强度大于3 kN/个的球团,大大降低了球团的焙烧温度。使用硫酸渣能生产出优质的球团供高炉使用。In connection with characteristic of pyrite cinder,the characteristic of oxidized pellet prepared from pyrite cinder and the mechanism of moisture grinding on pellet preparation were studied.The results show that the strength of green balls is very low,and the moisture of green balls is fairly higher without moisture grinding.Moisture grinding is an effective means to improve the strength and reduce the moisture of green ball with the less dosage of bentonite by improving size distribution,specific surface area and lowering the porosity of green balls.Moisture grinding can improve the roasting performance of pyrite cinder pellet by improving the surface energy of pyrite cinder and increasing contact points between particles,which has the advantages of diffusion.The compressive strength of pellets overruns 3 kN per pellet with moisture grinding after roasted at 1 150 ℃ for 10 min.The roasting temperature can be greatly reduced.The high quality oxidized pellet can be produced as a blast furnace feed by using pyrite cinder.

关 键 词：硫酸渣 球团 润磨 综合利用 

分 类 号：TF046[冶金工程—冶金物理化学]