利用爆破预测结果对岩石破碎进行对比分析

G. Agyei, M. Owusu-Tweneboah
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引用次数: 5

摘要

这项工作提出了目前在Perseus矿业加纳有限公司(PMGL)的Fobinso坑使用的钻井和爆破可控参数的预测和优化。该矿初次爆破后产生的炸药粒度问题是该矿面临的挑战。砾石的存在需要二次破碎,以进一步减少破碎物料到可接受的尺寸,从而增加了生产成本。采用Protodyakonov岩石强度指数测定岩石的力学性能。利用Konya和Walter(1990)、比例原理和1987年开发的Instituto Geologo Minero de España (IGME)模型估算了钻井和爆破参数。采用改进的Kuz-Ram模型,对爆破效果进行了预测和分析,该模型基于爆破间距、装药量、钻孔直径、装药密度、单孔装药量、装药长度和火药因子等参数。比较分析了不同模型在直径为65 mm和110 mm时的预测粒度分布,发现粒径分数之间没有显著差异。根据比例原理,得出了爆破的最佳技术经济指标。关键词:破片,钻孔参数,初爆,模型,二次爆破
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A Comparative Analysis of Rock Fragmentation using Blast Prediction Results
This work presents prediction and optimisation of controllable parameters of drilling and blasting currently used at the Fobinso Pit of Perseus Mining Ghana Limited (PMGL). The mine faces challenges with blast particle sizes produced after primary blasting. The presence of boulders requires secondary fragmentation to further reduce the broken materials to the acceptable sizes, thereby increasing the cost of production. The mechanical properties of the rocks were determined using Protodyakonov Rock Strength Index. The drill and blast parameters were estimated using the Konya and Walter (1990), Principle of Proportionality, and Instituto Geologo Minero de España (IGME) model developed in 1987. The Modified Kuz-Ram model was used to predict and analyse the results of blasting based on the parameters such as spacing, burden, drillhole diameter, charge density, charge per hole, charge length, and powder factor. A comparative analysis of the predicted size distributions of the various models using diameters of 65 mm and 110 mm revealed no significant differences between the size fractions. The Principle of Proportionality produced the best technical and economic indices for blasting. Keywords: Fragmentation, Drilling Parameters, Primary Blasting, Models, Secondary Blasting
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