一步法直接还原新疆磁铁精矿

来源期刊:中南大学学报(自然科学版)2007年第3期

论文作者:朱德庆 李建 邱冠周 潘建 欧应钦 周围

文章页码:421 - 421

关键词:铁精矿;直接还原;预热球团;氧化球团

Key words:iron concentrate; direct reduction; preheated pellets; fired pellets

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。

Abstract: 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.

基金信息: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
中南大学研究生教育创新工程资助项目

相关论文

  • 暂无!

相关知识点

  • 暂无!

有色金属在线官网  |   会议  |   在线投稿  |   购买纸书  |   科技图书馆

中南大学出版社 技术支持 版权声明   电话:0731-88830515 88830516   传真:0731-88710482   Email:administrator@cnnmol.com

互联网出版许可证:(署)网出证(京)字第342号   京ICP备17050991号-6      京公网安备11010802042557号