摘要:
袁家村铁矿选矿厂综合尾矿TFe品位17.50%,主要含铁矿物为赤(褐)铁矿和磁铁矿,有害元素硫、磷含量很低,铁矿物嵌布粒度细小,回收难度较大.为了给该尾矿的综合利用提供技术支持,对其进行了预富集-磁化焙烧-磁选工艺研究.结果表明:在磨矿细度为-0.037 mm75%(不磨),强磁选粗选背景磁场强度为478 kA/m,强磁选精选背景磁场强度为398 kA/m的条件下,可获得铁品位为23.24%、铁作业回收率为86.38%的强磁选预富集精矿;强磁选预富集精矿在气体流量5 m3/h、CO浓度30%、磁化焙烧温度560℃、焙烧时间15min、焙烧产物磨矿细度为-0.037 mm90%、弱磁选磁场强度为88 kA/m的条件下,可获得铁品位61.82%、铁作业回收率80.91%、对原矿回收率55.98%的铁精矿产品.
Abstract:
Iron grade of Yuanjiacun iron synthetic tailings is 17.50%,in which iron exists mainly in form of hematite-limonite and magnetite.The content of harmful elements such as sulfur,phosphorus is very low.In order to provide technical basis for comprehensive utilization of the tailing,the process of pre-concentrationmagnetizing roast-magnetic separation was carried out.The results indicated that:at the grinding fitness of-0.037mm 75%,roughing background field intensity at 478 kA/m and cleaning background magnetic induction intensity at 398 kA/m,the high intensity pre-concentration concentrate with iron grade of 23.24%and recovery of 86.38% was obtained.With gas flow rate of 5 m3/h,CO concentration 30%,roasting temperature at 560℃ for 15 min,roasted product grinding fineness of 90%-0.037 mm and low intensity magnetic field intensity at 88 kA/m,the iron grade of 61.82% and operation recovery of 80.91%(General iron recovery was 55.98%) can be obtained.
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