包钢铁精矿生产含氧化镁球团矿的实验研究
赵彬1,2 ,罗果萍1 ,刘景权2 ,郝志忠2
关键词：自产铁精矿；MgO；蛇纹石；球团矿
中图分类号：THO46.6 文献标识码：A
摘要：通过添加不同比例的蛇纹石及轻烧白云石来提高球团原料中MgO含量。模拟包钢球团矿生产工艺进行焙烧，对生球性能、成品球抗压强度及还原膨胀性能进行了研究，以探明包钢自产球团矿提高MgO含量的合理技术措施。研究表明：当加入2.0%的皂土并配加4.0%以下的轻烧白云石或2.2%以下的蛇纹石时，所制备生球性能均能满足生产要求；当轻烧白云石添加量由2.0%增加到4.0%时，1250℃下焙烧的成品球团矿的抗压强度由2250N/个降低为2239N/个，其还原膨胀率由32.1%升高到34.5%；当蛇纹石添加量由1.1%增加到2.2%时，1250℃下焙烧的成品球团矿的抗压强度由2250N/个降低为2248N/个，其还原膨胀率由19.7%降低到16.7%。因此，对于包钢自产铁精矿生产含氧化镁球团矿，其含镁熔剂的最佳添加方式为配加蛇纹石。
Experimentresearch for production of iron concentrate containing magnesium oxide pelletsat Baogang
ZHAOBin 1,2 ,LUO Guo-pong1,LIU Jing-quan2,HAO Zhi-zhong2
(1. Materials and Metallurgy School , Inner Mongolia University of Science and Technology,
2.Rare-EarthSteel Plate Company, Baotou Iron and Steel (Group)Co., Baotou 014010,China)
Key words: self-mined concentrates, MgO, serpentine, pellet
Abstract:Through the addition of differentproportion serpentine and lighting roasting dolomite, the content of MgO in rawmaterial was increased. Baogang pellets production technology for roasting was simulated. Theperformance of green pellet , the reduction swelling characters andcompressive strength of the finished product were studied in order to prove up a reasonable technicalmeasure to improve the content of MgO in Baogang -produced pellets. Researchshows that, when adding 2.0% bentonite together with light burned dolomite ofless than 4.0% or serpentine below 2.2%, the preparation of raw ballperformance can meet the production requirements; when light burned dolomitecontent was increased from 2.0% to 4.0%, the compressive strength of the pelletsat 1 250 ℃ was reduced from 2 250 N to 2239 N, with the reduction of inflation rate increased from 32.1% to 34.5%. When serpentine contentincreased from 1.1% to 2.2%,the compressive strength of the calcination pelletsproduct under 1250 ℃ decreased to 2248 N from 2250 N, with the inflation rate reduced to 16.7% from 19.7%. Therefore, the best way for the production of ironore concentrate containing magnesium oxide pellet, is to add magnesium fluxwith the addition of serpentine.