带式焙烧机制备镁质球团的工艺及机理研究  

Study on technology and mechanism of magnesia-containing pellets produced by straight grate indurating machine

作　　者：潘建[1] 王硕 甘牧原 阮志勇 王子宏 Pan Jian;Wang Shuo;Gan Muyuan;Ruan Zhiyong;Wang Zihong(School of Minerals Processing and Bioengineering , Central South University, Changsha 410083 , Hunan;Guangxi Liazhou Iron and Steel Group Co. , Ltd. , Liuzhou 545000, Guangxi)

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]广西柳州钢铁集团有限公司,广西柳州545000

出　　处：《烧结球团》2019年第3期27-33,共7页Sintering and Pelletizing

基　　金：广西创新驱动发展专项资金项目(桂科AA18242003)

摘　　要：针对镁质球团在回转窑中易粉化而造成结圈进而影响生产顺利进行的问题,以管炉试验为基础,采用半工业实验模拟带式焙烧机制备镁质球团的方法,研究在最佳焙烧制度下不同碱度与不同MgO质量分数对球团化学成分、冷态强度、冶金性能与高温固结特性的影响。结果表明:随着MgO质量分数的增加,成品球团矿抗压强度略微下降,但成品球团矿的还原膨胀率有所降低,软化温度区间与软熔温度区间有所提高。在预热温度900℃、预热时间6 min、焙烧温度1 170~1 250℃、焙烧时间12 min、均热温度1000℃、均热时间3 min的热工制度下,70%巴矿与30%澳矿的混合矿在模拟带式焙烧机条件下,可以得到强度达标、冶金性能较好的成品球团矿。In view of the problem that magnesia-containing pellets are easy to disintegrate in rotary kiln which results in ringing and affects the smooth operation of production,and based on tube furnace test and by adopting the semi-industrial test to simulate the preparation of magnesia-containing pellets with straight grate machine,the effects of different basicity and different MgO mass fraction on chemical composition,cold strength,metallurgical properties and high temperature consolidation properties of pellets under optimal indurating conditions are studied.The results show that,with the increase of MgO mass fraction,the compressive strength of finished pellets decreases slightly,but the reduction swelling index of finished pellets somewhat decreases,the softening temperature range and the soft melting temperature range somewhat increase.Under the thermal system of preheating temperature 900 ℃,preheating time 6 min,roasting temperature 1 170~1 250 ℃,roasting time 12 min,heat soaking temperature 1 000 ℃ and heat soaking time 3 min and under the simulated straight grate machine condition of mixture of 70% Brazil concentrates and 30% Australian concentrates,the pellets with high strength and good metallurgical properties can be obtained.

关 键 词：带式焙烧机 镁质球团 冷态强度 冶金性能 

分 类 号：TF046.6[冶金工程—冶金物理化学]