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首页> 外文期刊>Minerals Engineering >Geometallurgical characterisation of Merensky Reef and UG2 at the Marikana Mine, Bushveld Complex, South Africa
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Geometallurgical characterisation of Merensky Reef and UG2 at the Marikana Mine, Bushveld Complex, South Africa

机译：南非布什维尔德综合体Marikana矿区Merensky Reef和UG2的地球冶金特征

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摘要

The influence of mineralogy on the milling performance and the flotation-based recovery of Au, the platinum group elements (PGE), Co, Cr, Cu, Ni and S was investigated for three samples of the Merensky Reef (BK, RPM and WP facies types) and one sample of the UG2 at the Marikana mine, using a mineral liberation analyser (MLA). The samples differ in their milling behaviour in that a range of milling times are required in order to produce a grind of 60% passing 75 μm..This is primarily controlled by the abundance of plagioclase, orthopyroxene and chromite. The size distribution of the base metal sulfides (BMS; pyrrhotite, pentlandite and chalcopyrite) is similar for the three samples of Merensky Reef, and is significantly coarser than for BMS in the sample of the UG2. Upon milling to 60% passing 75 μm, the best BMS liberation is achieved for the BK facies type of Merensky Reef, relative to RPM and WP. The degree of BMS liberation in the sample of UG2 is lower than that for samples of the Merensky Reef. Cumulative mass pull during flotation is higher for the sample of the WP facies of Merensky Reef than for the rest of the samples examined. This is due to the higher abundance of orthopyroxene in this sample, which is known to be naturally floating, and which reports to concentrate. A high flotation-based recovery of PGE, Cu and S is observed for all four samples, with the highest recovery associated with the sample of the BK facies type of Merensky Reef. Ni recoveries are generally poor, suggesting that Ni is associated with gangue minerals, in addition to that in pentlandite. Of the three facies types of Merensky Reef examined, the overall characteristics of the BK facies type i.e. a high PGE grade, low abundance of orthopyroxene, a high abundance of BMS, and a higher degree of liberation of the BMS on milling of the ore, represent the most favourable set of characteristics for the efficient recovery of PGE. It is therefore the best quality ore of the three samples of Merensky Reef examined.
机译：对于梅伦斯基礁（BK，RPM和WP相）的三个样品，研究了矿物学对金粉，金，铂族元素（PGE），钴，铬，铜，镍和硫的研磨性能和浮选回收率的影响。类型）以及在Marikana矿山上使用矿物释放分析仪（MLA）采集的UG2样品之一。样品的研磨行为不同，需要经过一定的研磨时间才能产生60％通过75μm的研磨。这主要是由斜长石，邻位邻苯二茂铁和铬铁矿的含量控制的。 Merensky Reef的三个样品的贱金属硫化物（BMS;黄铁矿，膨润土和黄铜矿）的尺寸分布相似，并且比UG2样品的BMS粗得多。研磨至60％通过75μm后，相对于RPM和WP，Merensky Reef的BK相类型获得了最佳的BMS释放。 UG2样品中BMS的释放程度低于Merensky Reef样品中的BMS释放程度。 Merensky Reef的WP岩相样品在浮选过程中的累积质量拉力要高于其余检查的样品。这是由于该样品中邻苯二酚的丰度较高，已知该样品是天然漂浮的，并且据报道会浓缩。在所有四个样品中均观察到了基于浮选的PGE，Cu和S的高回收率，其中与Merensky Reef的BK相类型样品相关的回收率最高。镍的回收率通常很差，这表明除了五氧化三镍之外，镍还与脉石矿物有关。在所研究的梅伦斯基礁岩的三种相类型中，BK相类型的总体特征是：PGE品位高，邻苯二甲酚含量低，BMS含量高以及矿石研磨时BMS的释放度高，代表了有效回收PGE的最有利的一组特性。因此，它是Merensky Reef的三个样本中质量最高的矿石。

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