铁矿尾矿梯级资源化利用方案研究

文章针对铁矿尾矿大量堆存排放的安全、生态隐患，结合棒磨山尾矿化学成分、粒度分布特征，提出进行资源化研究利用。在目前铁尾矿资源化利用研究现状的基础上，首先对高硅铁尾矿（一次尾矿）进行再磨再选生产铁精矿，然后对再选剩余物（二次尾矿）进行分级处理，粗粒级（0.25 mm以上）部分即为商品砂，细粒级部分分别采用液碱湿法活化和固体碱渣干法活化工艺制备系列含硅肥料，并对铁精矿、商品砂、含硅肥市场进行市场效益分析，以期实现矿山废弃物的100%梯级利用。 

PROGRESSIVE RECOVERY PLANS OF IRON ORE TAILINGS

Large dumps of iron ore tailings threaten safety and eco-environment. Based on the current studies of iron ore tailings recovery, this paper presents a new plan to recover the iron ore tailings according to their chemical components and particle size distribution, first to re-grind and re-process the Si-high iron ore tailings ( the first tailings) to produce iron ore concentrates, and then to screen the remains (the second tailings) with the coarse above 0.25mm as commercial sands and with the fines processed by liquid alkaline wet activation and solid alkaline slag drying to produce silica-bearing fertilizer. This paper also analyzes their market benefits of iron ore concentrates, commercial sands and silica-bearing fertilizer, aiming at a 100% progressive recovery of iron ore tailings.