一步法直接还原新疆磁铁精矿  

One-step process for direct reduction of Xinjiang magnetite concentrate

作　　者：朱德庆[1] 李建[1] 邱冠周[1] 潘建[1] 欧应钦 周围 

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公司,湖南长沙410001 [3]新疆紫金矿业公司,新疆乌鲁木齐830000

出　　处：《中南大学学报（自然科学版）》2007年第3期421-427,共7页Journal of Central South University:Science and Technology

基　　金：国家教育部高等学校优秀青年教师教学科研奖励基金资助项目(教人司[2000]26);中南大学研究生教育创新工程资助项目(1343-75213)

摘　　要：以新疆磁铁精矿为原料,采用“一步法”直接还原,研究粘结剂种类和润磨方式对生球质量的影响,高强度、高还原性预热球团的制备及煤基直接还原的工艺。研究结果表明,对于铁品位为69.21%的新疆磁铁精矿,采用润磨工艺,并添加粘结剂XB能明显改善生球质量;干燥后的生球在800℃预热10 min后,球团抗压强度达到581 N/个,将预热球团在1 050℃还原80 min,得到直接还原铁(DRI)的质量指标为:总Fe含量为90.33%,金属铁含量为85.05%,金属化率达到94.15%。与传统的预热-高温氧化-高温还原煤基回转窑直接还原工艺相比,“一步法”省去了高温氧化这一高能耗(1 150～1 300℃)工序,且还原所得产品结构完整,外表光滑,无裂纹。Xinjiang magnetite concentrate was studied by novel one-step process for direct reduction. The effects of binder and damp mill on green balls, the process for preheated pellets with high strength and easy reduction, and coal-based direct reduction iron （DRI） were studied. The results show that for Xinjiang magnetite assaying with 69.21% Fe, damp milling and adding agent XB can improve the quality of green balls obviously. After drying, green balls are preheated at 800 ℃ for 10 min, pellets with compressive strength of 581 N/pellet are achieved. And preheated pellets were directly reduced at 1 050 ℃ for 80 min, directly reduced iron（DRI） assaying 90.33% total iron and 85.05% metallic iron and 94.15% metallization degree are achieved. Compared with the traditional direct reduction of fired oxide pellets in coal-based rotary kilns, one-step process for direct reduction can avoid high temperature oxidation of pellets at 1 150-1 300 ℃, and possesses some advantages such as： greater economic profit, good quality of direct reduced iron.

关 键 词：铁精矿 直接还原 预热球团 氧化球团 

分 类 号：TF551[冶金工程—钢铁冶金]