对国内某地菱铁矿进行无还原剂全粒级磁化焙烧-磁选研究. 结果表明，菱铁矿在无还原剂条件下于800℃焙烧15 min，所得焙烧矿在磨矿粒度小于0.074 mm占90%、磁场强度0.10 T条件下磁选，得到铁品位63.15%、铁回收率92.52%的铁精矿. 磁选精矿中的锰、镁和部分钙与铁元素以类质同像共存.

The magnetizing roasting and magnetic separation without addition of reductant were used to treat all-size siderite iron ore from China for recovery of iron concentrate. The results showed that the final iron concentrate containing 63.15% total Fe content with the iron recovery rate of 92.52% was obtained under the conditions of roasting of siderite ore at 800℃ for 15 min without addition of reductant, and separation of roasted ore by grinding up to the particle sizes of below 0.074 mm with 90% at 0.10 T magnetic field intensity. The elements of Mn, Mg and part of Ca existed in the form of isomorphism with Fe in the iron concentrate.