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Fine and Coarse Iron Ore Beneficiation – An Evaluation into Global Technologies and Techniques

机译：粗粗铁矿选矿—对全球技术的评价

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The mining of iron ore is a high volume low margin business because the value of this commodity isrnsignificantly lower than that of base metals. The main metallurgical challenges in most of the iron orernprojects proposed for treatment nowadays have been in finding the optimum flowsheet for therntreatment of magnetite ores, mixed magnetite-hematite ores and even ores that have banded ironstonernformations (BIF). The associated plant designs incorporate very high capacity milling systems torngrind the ore down prior to magnetic separation and in being highly capital intensive requiresrnsubstantial investment in mega processing plants with associated infrastructure to mill down the runof-rnmine ore to the desired treatment size for upgrading.rnTo minimise the cost of infrastructure, better beneficiation techniques and technologies are beingrnsought to assist in reducing upfront ROM feed to allow for reduction in overall treatment plantrnfootprint necessary in extracting the desired downstream product. This paper discusses suchrnbeneficiation techniques and advancement in technologies for the upgrading of coarse and fine ironrnore utilising dense media separation (DMS), jigging, wet magnetic separation, dry magneticrnseparation, flotation and x-ray processing.rnAnother group of iron ore projects involve the mining of hematite ore below the water table. Often thernmined ore is wet and sticky. This combination requires high capacity processing of feed materialrnutilising large scrubbers or attritioning units to effectively remove the slimes component present in thernfeedstock. The fines removed, usually below 1 mm, are then discarded in large tailings storagernfacilities. Approaches to recovering the saleable material contained within these fines will also berninvestigated in this paper. This not only implies possible reduction in slimes discard footprint, but alsornholds potential benefit in augmenting overall yield and recovery of hematite product.
机译：铁矿石的开采是一项大批量，低利润的业务，因为该商品的价值大大低于贱金属。如今，大多数提议进行处理的铁矿项目的主要冶金挑战是寻找最佳处理流程，以处理磁铁矿，混合磁铁矿-赤铁矿矿石甚至带铁矿岩层（BIF）的矿石。相关的工厂设计包括非常高容量的铣削系统，用于在磁选之前将矿石磨碎，并且是高度资本密集型的​​需求-对大型加工厂的大量投资以及相关的基础设施，将纯天然的矿石磨碎至所需的处理尺寸以进行升级。为了最大程度地减少基础架构的成本，人们正在寻求更好的选矿技术和技术，以帮助减少前期ROM进料，从而减少提取所需下游产品所需的总体处理厂占地面积。本文讨论了这样的选矿技术以及利用稠密介质分离（DMS），跳汰，湿磁选，干磁选，浮选和X射线处理技术提纯粗铁矿和精铁矿的技术进展。另一组铁矿石项目涉及采矿地下水位以下的赤铁矿矿石。被开采的矿石通常是湿的且发粘的。这种组合需要利用大型洗涤塔或减磨装置对原料进行高容量处理，以有效去除原料中存在的煤泥成分。除去的细粉通常在1毫米以下，然后丢弃在大型尾矿存储设施中。本文还将研究回收这些罚款中所包含的可销售材料的方法。这不仅意味着可以减少煤泥丢弃物的足迹，而且还具有提高总产量和赤铁矿产品回收率的潜在优势。

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