Effect of mineralogy on grindability -A case study of copper ores

IF 0.9 4区材料科学 Q3 Materials Science

Journal of The South African Institute of Mining and Metallurgy Pub Date : 2023-04-14 DOI:10.17159/2411-9717/1714/2023

T. Nghipulile, T. Moongo, G. Dzinomwa, K. Maweja, B. Mapani, J. Kurasha, M. Amwaama

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Abstract

The effect of mineralogy on the grindability was investigated using three copper ores - two sulphides and one oxide. The dominant copper minerals were identified by optical microscopy and mineral chemistry derived from SEM-EDS analysis. The sample designated sulphide 1 was bornite-rich, sulphide 2 ore was mainly chalcopyrite, and the oxide ore was predominantly malachite and minor azurite. The gangue minerals were identified using semi-qualitative XRD analysis. Sulphide 1 contained more than 80% (w/w) of quartz compared to about 70% in the other two ores. The Bond work indices were 13.8, 21.6, and 17.3 kWh/t for sulphide 1, sulphide 2, and oxide ore respectively. This suggested that the chalcopyrite-rich ore is the hardest, while the malachite-rich ore has intermediate hardness, and the bornite-rich ore is the softest. The brittleness indices of the ores were calculated using the chemical composition of the gangue, and a good correlation between brittleness indices and Bond work indices was observed, which highlights the importance of the gangue composition in determining the fracture behaviour of the ores. There is scope for further investigation into the relationship between ore mineralogy and comminution behaviour using other breakage characterization techniques.

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矿物学对可磨性的影响——以铜矿石为例

使用三种铜矿——两种硫化物和一种氧化物——研究了矿物学对可磨性的影响。通过光学显微镜和SEM-EDS分析得出的矿物化学鉴定了主要的铜矿物。指定为硫化物1的样品富含斑铜矿，硫化物2的矿石主要为黄铜矿，氧化物矿石主要为孔雀石和少量天青石。采用半定性XRD分析对脉石矿物进行了鉴定。硫化物1含有超过80%（w/w）的石英，而其他两种矿石中的石英含量约为70%。硫化物1、硫化物2和氧化物矿石的粘结功指数分别为13.8、21.6和17.3 kWh/t。这表明富含黄铜矿的矿石是最坚硬的，而富含孔雀石的矿石具有中等硬度，富含斑铜矿的矿石最柔软。利用脉石的化学成分计算了矿石的脆性指数，并观察到脆性指数与粘结功指数之间的良好相关性，这突出了脉石成分在决定矿石断裂行为中的重要性。使用其他破碎表征技术对矿石矿物学和粉碎行为之间的关系进行进一步研究还有余地。

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来源期刊

Journal of The South African Institute of Mining and Metallurgy 工程技术-矿业与矿物加工

CiteScore

1.50

自引率

11.10%

发文量

审稿时长

4-8 weeks

期刊介绍： The Journal serves as a medium for the publication of high quality scientific papers. This requires that the papers that are submitted for publication are properly and fairly refereed and edited. This process will maintain the high quality of the presentation of the paper and ensure that the technical content is in line with the accepted norms of scientific integrity.