摘要
采用高压辊磨技术预处理硫酸渣改善生球质量和强化球团焙烧,并且与传统的润磨技术进行对比。研究结果表明:高压辊磨和润磨预处理硫酸渣均可大幅度提高生球质量,在膨润土用量大幅降低的同时,生球落下强度从9.0次/(0.5 m)分别增加到大于30.0次/(0.5 m)和27.4次/(0.5 m),抗压强度从7.2 N/个分别增加到10.6 N/个和13.7 N/个,造球水分降低约6.5%,爆裂温度在540℃以上;经高压辊磨和润磨预处理后,硫酸渣球团预热温度均降低150℃,焙烧温度均降低80℃,焙烧时间均减少6 min,强化了硫酸渣球团矿焙烧;高压辊磨和润磨的作用机理在于提高硫酸渣比表面积,增大表面能和表面活性,促进固相扩散反应,强化球团固结,但是,高压辊磨的产能远高于润磨的产能,且单位能耗比润磨的低。
The pretreatment of pyrite cinder was studied using high pressure roll grinding（HPRG）,which aims to improve the quality of green pellets and reinforce roasting performance of pyrite cinder pellets,and HPRG was compared with damp milling was made.The results show that both HPRG and damp milling can significantly improve green ball quality while bentonite consumption is dramatically reduced,the drop number of green balls increases from 9.0 times without pretreatment to more than 30.0 times from 0.5 m height by pretreating the pyrite cinder using HPRG and 27.4 times from 0.5 m height by using damp milling,the compressive strength increases from 7.2 N per pellet without pretreatment to 10.6 N per pellet by using HPGR to pretreat cinder and 13.7 N per pellet by using damp milling,respectively.Thermal shock temperature of green balls is above 540 ℃ and the moisture of green pellets drops by 6.5%.After the pyrite cider is pretreated by HPRG and damp milling,the preheating and roasting temperatures of the pyrite cinder pellets are decreased by 150 ℃ and 80 ℃,respectively,and the roasting time is shortened by 6 mines.Therefore,the roasting performance of pyrite cinder pellets is reinforced greatly by HPRG and damp milling.The mechanisms of HPRG and damp milling show that specific surface areas and surface energy and activity are improved,and that solid diffusion reactions are enhanced,resulting in strong bonding inside fired pellets.However,productivity of HPRG is much higher than that of damp milling,and unit energy consumption is lower than that of damp milling.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2011年第7期1825-1832,共8页
Journal of Central South University:Science and Technology
基金
国家科技部火炬计划项目(2008gh61431)
关键词
硫酸渣
高压辊磨预处理
润磨预处理
球团矿
pyrite cinder
pretreatment by high pressure roller
pretreatment by damp milling
pelletization
