摘要
召夸赤铁矿原矿品位低,嵌布粒度细。采用流化床作为直接还原装置,以H2与N2的体积比为1∶4的混合气体作为还原气,对召夸赤铁矿进行直接还原—磁选试验。结果表明:在700℃下将磨矿细度为-150目占92%的原矿直接还原70min,可得金属化率为85.89%的还原矿。将还原矿在球磨机中细磨至平均粒径为3.98μm,在场强为63.66kA/m的磁选管中磁选,可得品位为73.04%,回收率为77.28%铁精矿。
The hematite ore from Zhaokua has a low grade and fine dissemination size. The test on the direct reduction-magnetic separation of this ore was made, with H2 and N2 mixture in a volume ratio of 1 ： 4 as the reducing gas. The run-of-mine ore ground to 92% - 150 mesh was treated by direct reduction for 70min at 700℃ to get a metallization rate of 85.89%. The reduced ore was then finely ground to 3.98 μm on average and separated in a magnetic tube at 63.66 kA/ m. As a resuh, an iron concentrate grading 73.04% at a recovery of 77.28% was obtained.
出处
《金属矿山》
CAS
北大核心
2009年第6期56-59,共4页
Metal Mine
基金
国家重点基础研究发展规划(973)项目(编号:2007CB613502)
关键词
赤铁矿
流化床
直接还原
磁选
Hematite, Fluidized bed, Direct reduction, Magnetic separation
