Abstract The heterogeneous nature of orebodies introduces large uncertainties into all quantitative evaluations, process design and process predictions. Measuring the extent of the variability of ore competence will allow the design process to account for variation in process performance through a quantitative knowledge of its uncertainties related to ore hardness. The conventional JKMRC drop-weight test (JKDWT) establishes the relationship between input energy (Ecs) and product fineness (t10) from which the breakage potential parameter A × b can be estimated, by combining the broken progeny of groups of particles. A new method, the Extended Drop Weight Test (ExDWT), has been developed which is applied to individual particles and is therefore capable of capturing breakage heterogeneity at high resolution. This paper explores a number of features of the new method, based on breakage tests on individual particles from several different rock types. The results showed that more accurate descriptions of particle size resulted in higher (softer) A × b values which suggests that the standard method may have been over-estimating rock competence. Regular-shaped cores broken diametrally were found to have higher (softer) A × b values than axially broken cores and irregular shaped particles. These tests also suggested that the true ore intrinsic heterogeneity is the main source of breakage variability measured by the ExDWT. The mean A × b values determined by the ExDWT showed no statistical difference to those determined by the standard JKDWT method, but the standard deviation of the estimate was much lower. The results have demonstrated the potential of the new method for capturing the inherent heterogeneity of individual ore particles. Such information could be used to populate multi-component models of comminution.

中文翻译：

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扩展跌落重量测试方法——它揭示了什么

摘要 矿体的异质性给所有定量评价、工艺设计和工艺预测带来了很大的不确定性。测量矿石能力的可变性程度将允许设计过程通过其与矿石硬度相关的不确定性的定量知识来解释过程性能的变化。传统的 JKMRC 落锤试验 (JKDWT) 建立了输入能量 (Ecs) 和产品细度 (t10) 之间的关系，由此可以通过组合颗粒组的破碎后代来估计破碎潜力参数 A × b。已开发出一种新方法，即扩展落锤测试 (ExDWT)，该方法适用于单个颗粒，因此能够以高分辨率捕获破损异质性。本文基于对来自几种不同岩石类型的单个颗粒的破碎测试，探讨了新方法的许多特征。结果表明，对粒度的更准确描述导致更高（更软）的 A × b 值，这表明标准方法可能高估了岩石的能力。发现径向破碎的规则形状的核心比轴向破碎的核心和不规则形状的颗粒具有更高（更软）的 A × b 值。这些测试还表明，真正的矿石内在异质性是 ExDWT 测量的破损变异性的主要来源。ExDWT 确定的平均 A × b 值与标准 JKDWT 方法确定的没有统计学差异，但估计的标准偏差要低得多。结果证明了新方法捕获单个矿石颗粒固有的异质性的潜力。此类信息可用于填充多组分粉碎模型。