An evaluation of factors affecting the robustness of colour measurement and its potential to predict the grade of flotation concentrate
An evaluation of factors affecting the robustness of colour measurement and its potential to predict the grade of flotation concentrate
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DOI：
10.1016/j.mineng.2008.03.018
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发表时间：
2009
影响因子：
4.8
通讯作者：
J. Reddick;A. Hesketh;Sameer H. Morar;D. Bradshaw
中科院分区：
文献类型：
--
作者：
J. Reddick;A. Hesketh;Sameer H. Morar;D. Bradshaw
机器视觉在泡沫浮选方面的最新发展表明，利用泡沫表面描述符的测量来改进浮选池和浮选池的操作是有潜力的。其中一个描述符，泡沫颜色，传统上被认为与回收精矿的品位有关。这项工作旨在测试这一假设，并使用机器视觉系统SmartFroth进行了测试。该系统包括一个内置LED照明的摄像头罩，一个颜色校准贴片和一个CIE ‘ Lab ’色彩空间转换算法，这些都有助于减少环境照明对颜色测量的影响。通过比较不同光照条件下干燥合成矿石的颜色测量值来评估这些技术的有效性。研究发现，环境光照的影响并没有完全消除。对来自Kennecott Utah铜选矿厂的硫化物矿石进行了批量浮选试验，并确定泡沫颜色不能解释夹带脉石，这在泡沫表面几乎不可见。因此，仅用泡沫颜色不能准确预测精矿品位。
Recent developments in machine vision, applied to froth flotation, show the potential for the use of the measurement of froth surface descriptors to provide an improvement to the operation of flotation cells and banks. One such descriptor, froth colour, has been traditionally assumed to relate to the grade of the concentrate recovered. This work sets out to test this assumption, and was performed using a machine vision system, SmartFroth. This system included a camera hood with built in LED lighting, a colour calibration patch and a CIE ‘Lab’ colour space conversion algorithm, which all served to reduce the effect of ambient lighting on the colour measurements. The effectiveness of these techniques was evaluated by comparing colour measurements of dry synthetic ore under various lighting conditions. It was found that the influence of ambient lighting had not been completely eliminated. Batch flotation tests were conducted on a sulphide ore, from the Kennecott Utah Copperton Concentrator, and established that froth colour does not account for entrained gangue, which is barely visible on the froth surface. Thus, froth colour alone cannot be used to accurately predict concentrate grade.