Application of near infrared sensors to preconcentration of hydrothermally-formed copper ore
Application of near infrared sensors to preconcentration of hydrothermally-formed copper ore
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DOI：
10.1016/j.mineng.2015.10.020
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发表时间：
2016
影响因子：
4.8
通讯作者：
S. Iyakwari;H. Glass;G. Rollinson;P. Kowalczuk
中科院分区：
文献类型：
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作者：
S. Iyakwari;H. Glass;G. Rollinson;P. Kowalczuk
近红外传感器是一种非常有用的技术，用于复杂矿石的定性分析，因此可用于矿石的预选。本文对智利北方Los Pozos矿区某矿热液形成的铜矿石样品进行了近红外光谱响应分析，将其分为成品、中品和废料三种类型。从脉石（废物）中的含铜矿物（产品）的分类被认为是在2000至2400 nm的较长波长处的振动组合带。该地区具有碳酸盐和羟基脉石矿物的特征。在1400和1900 nm的近红外特征被认为是不利于分类和随后的歧视，因为它们可以被水分和其他环境因素的影响，并容易被抑制的富铁矿物。结果表明，仅针对方解石（碳酸盐）为主的颗粒作为废物的歧视提供了最佳的选择预浓缩。近红外鉴别分析与矿物学（QEMSCAN®和XRD）和元素（XRF）数据分类密切相关。结果表明，近红外光谱法是一种适用于表生铜矿石的富集方法。
Near infrared sensors can be a very useful technique for the qualitative analysis of complex ores, and thus could be useful for the preconcentration of ores. In this paper, individual particles of hydrothermally-formed copper ore sampled from a mine in the Los Pozos mining district, northern Chile, were classified as product, middling and waste based on their near infrared response. The classification of copper bearing minerals (product) from gangue (waste) was considered for vibration combination bands at longer wavelengths from 2000 to 2400 nm. This region exhibits characteristic features for carbonates and hydroxyl gangue bearing minerals. The near infrared features at 1400 and 1900 nm were not considered favourable for classification and subsequent discrimination because they can be influenced by moisture and other environmental factors and are easily suppressed by iron-rich minerals.Two near infrared preconcentration strategies were applied for particle discrimination. Results indicate that targeting only the calcite (carbonate) dominated particles for discrimination as waste provided the best option for preconcentration. The near infrared discrimination analysis correlates well with mineralogical (QEMSCAN® and XRD) and elemental (XRF) data classification. The results indicate that near infrared spectroscopy is a suitable preconcentration method for supergene copper ore.