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首页> 外文期刊>International Journal of Mineral Processing and Extractive Metallurgy >Characterisation of Biooxidation Feed and Products for Improved Understanding of Biooxidation and Gold Extraction Performance
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Characterisation of Biooxidation Feed and Products for Improved Understanding of Biooxidation and Gold Extraction Performance

机译：用于改善生物氧化和金提取性能的生物氧化饲料和产品的特征

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This paper presents a study on characterisation of refractory ore, biooxidation feed and product, and cyanidation tailings with the aim of understanding the causes of excessive continuous frothing, incomplete sulphide oxidation, high reagent consumption, high cyanidation residues and low overall recovery as encountered in biooxidation of refractory ores. Techniques involving carbon and sulphur speciation, Quantitative X-Ray Diffraction (QXRD), Scanning Electron Microscopy (SEM) and Optical Microscopy (OM) were used to characterise the ore samples, flotation concentrate (BIOX? feed), biooxidised product (BIOX? CIL Feed) and cyanidation tailings (BIOX? CIL Tails) from a biooxidation plant. The main minerals present in the ore were quartz (45%), chlorites (21%), plagioclase feldspar (13%), dolomite (5%), pyrite (2%) and mica group (2%). The flotation concentrate recorded 18% mica, and this was responsible for excessive frothing in the biooxidation circuit as confirmed by the QXRD analysis. The carry-over froth to the CIL circuit led to short-circuiting of poorly leached material into the cyanidation tailings, resulting in high cyanidation residues. Secondary refractory minerals; gypsum and jarosite, which were observed in the biooxidation product by the QXRD, have the potential to coat unreacted sulphide particles, leading to incomplete sulphide oxidation as observed here. Partially oxidised sulphides led to high consumption of reagents such as oxygen and cyanide during cyanidation. Gypsum and jarosite also encapsulated gold particles as observed in the BSED analysis. Coated gold particles had reduced access to lixiviants during the subsequent cyanidation process, leading to high leach residues. The biooxidised product (BIOX? CIL Feed) also recorded a high organic carbon content of 6.67, while analysis by BSED revealed the presence of graphitic carbon and coatings on gold surfaces; an indicator for high preg-robbing activities during cyanidation of the concentrate. Preg-robbing indices of 64.4% and 72.7% were recorded for the flotation concentrate (BIOX? feed) and BIOX~(?) CIL feed respectively. The overarching effect of all the observations is a decrease in overall gold recovery.
机译：本文提出了难治性矿石，生物氧化饲料和产品的表征的研究，以及染色尾矿，目的是了解过量发泡的原因，不完全硫化物氧化，高试剂消耗，高氰化物残余物和在生物氧化中遇到的低总体恢复难治性矿石。涉及碳和硫形态，定量X射线衍射（QXRD），扫描电子显微镜（SEM）和光学显微镜（OM）的技术用于表征矿石样品，浮选浓缩物（Biox〜进料），生物氧化产物（Biox？CIL来自生物氧化厂的饲料）和氰化尾矿（Biox？CIL尾部）。矿石中存在的主要矿物质是石英（45％），氯化物（21％），Plagioclase长石（13％），白云石（5％），黄铁矿（2％）和云母组（2％）。浮选浓缩物记录了18％的云母，这是通过QXRD分析证实的生物氧化回路中过度发泡的负责。 CIL电路的随身携带泡沫导致含量较差的氰化尾矿的短路，导致高氰化物残留物。二次耐火矿物质;通过QXRD在生物氧化产物中观察到的石膏和碱基，具有涂覆未反应的硫化物颗粒，导致在此观察到的不完全硫化物氧化。部分氧化的硫化物导致在氰化期间的试剂如氧气和氰化物的高消耗。石膏和杂体也将在BSED分析中观察到的金颗粒。在随后的氰化过程中，涂覆的金颗粒在随后的氰化过程中降低了李克西敏的进入，导致高浸出残留物。生物氧化产物（BioxαciL饲料）还记录了6.67的高有机碳含量，而BSED的分析显示了金表面上的石墨碳和涂层;浓缩菌氰化期间高PREG抢劫活动的指标。为浮选浓缩物（BioxαFeed）和Biox〜（α）CIL饲料分别记录了64.4％和72.7％的PREG-ROBBIBL索引。所有观察结果的总体效应是整体黄金恢复的减少。

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