摘要
在巴润精矿中添加有机添加剂经过圆盘造球机制成球团试样,分别探究添加剂对巴润精矿球团矿强度及还原行为的影响。研究结果表明,由于添加剂低温吸水,造球过程提高了其粘度及吸附力,加强了粒子间的凝聚力,使得生球落下强度,生球、干球抗压强度均趋于增大。在1 250℃焙烧后的成品球试样中,添加剂可在高温下分解产生气体,试样孔隙率逐步增大,由35.08%增加到60.23%,促使球团内部组织结构疏松,所能承受的载荷减小,导致成品球抗压强度随添加剂含量的增加而降低,由2 076.8 N/个降至1 344 N/个。但孔隙率的增大使还原性气体充分接触球团矿面积,并吸收球团矿还原过程铁氧化物晶体的膨胀与铁晶须生长,使球团矿还原膨胀率由44.28%降低至34.47%,同时其还原度由57.83%增加至64.89%。
Pellet samples prepared by adding additive agent into iron ore concentrate from Barun mine by disc pelletizer. The influence of additive agent on the strength of pellet and reduction behavior was respectively explored. The results show that additive agent that can absorb moisture at low temperature, which improves its viscosity and adsorption capacity in the pelletizing process and enhance the agglomeration between particles. Therefore, it increases the falling strength of green pellet, along with the compressive strength of green pellet and dry pellet. When roasting finished pellet samples reach to 1 250℃, additive agent can be completely resolved into preforming gas, which makes sample become larger, and increase the rate of porosity from 35. 08% to 60.23%. The loosen pellets＇ inner organization structure can reduce payload, as a result, the compressive strength of finished pellet is also decreased from 2076.8 N to 1344 N with increasing content of additive agent. However, the increase in porosity rate gives pellets and reducing gas greater contacting area, and absorbs iron oxide crystal expansion and whisker growth. This decreases pellets＇ expansion rate from 44.28% to 34.47% , while the reduction rate raises from 57.83% to 64.89%.
出处
《烧结球团》
北大核心
2017年第3期54-58,共5页
Sintering and Pelletizing
基金
国家自然科学基金资助(51364030)
关键词
添加剂
巴润精矿
孔隙率
抗压强度
还原行为
additive agent
iron ore concentrate from Barun mine
porosity
compressive strength
reduction behavior
