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金属矿山 ›› 2008, Vol. 38 ›› Issue (04): 67-70+92.

• 矿物工程 • 上一篇    下一篇

巴西镜铁矿球团前的高压辊磨预处理

朱德庆1,唐艳云1,Vinicius Mendes2,潘建1,翟勇1   

  1. 1.中南大学;2.巴西CVRD
  • 收稿日期:2007-02-10 出版日期:2008-04-15 发布日期:2011-07-20

Pretreatment of Brazilian Specularite before Pelletization by High Pressure Roller Grinding

Zhu Deqing1,Tang Yanyun1,Vinicius Mendes2,Pan Jian1,Zhai Yong1   

  1. 1.Central South University;2.CVRD, Brazil
  • Received:2007-02-10 Online:2008-04-15 Published:2011-07-20

摘要: 为改变巴西镜铁矿在氧化球团原料中配比很低的状况,采用高压辊磨新技术对巴西镜铁矿进行了球团前的预处理研究。结果表明:将巴西镜铁矿与磁铁精矿按7: 3比例搭配,按返回比为71%的模拟闭路过程进行高压辊磨预处理后,在膨润土添加量为2.4%、造球时间为15 min、造球水分为8%时,生球落下强度达到4.5次,抗压强度10.25 N/个,爆裂温度455 ℃;生球在预热温度为1 050 ℃、预热时间为10 min、焙烧温度为1 280 ℃、焙烧时间为12 min的条件下焙烧,成品球抗压强度达到2 690.88 N/个,满足球团生产的要求。

关键词: 巴西镜铁矿, 高压辊磨预处理, 球团

Abstract: To alter the very low proportion of Brazilian specularite in the feed of oxidized pellets, new technique of high pressure roller grinding (HPRG) was adopted in its pretreatment before the pelletization.The pellet feed composing 70% Brazilian specularite and 30% concentrate of magnetic separation was pretreated by HPRG at 71% circulating load in a simulated closed circuit, and then mixed with 2.4% bentonite, and pelletized for 15min at 8% moisture.The resultant green pellets achieved drop strength of 4.5 times, compression strength of 10.25 Newton per pellet and thermal shock temperature of 455 ℃.When the green pellets were preheated at 1 050 ℃ for 10 min and roasted at 1 280 ℃ for 12 min, the fired balls had compression strength of 2 690.88 Newton per pellet, satisfying the requirement of palletizing production.

Key words: Brazilian specularite, Pretreatment by high pressure roller grinding, Pelletization