Abstract In comminution, particle breakage starts with crack induction and propagation. The path of cracks defines the breakage mode, e.g. preferential in phase breakage or phase boundary breakage. For investigating crack formation behavior, the description by displacement fields can be applied. The displacement fields of the mineral phases can then be used to understand breakage mode and liberation. Ore texture and operational conditions such as loading mechanisms will affect the system. One of the ore texture aspects is the ore texture heterogeneity, which is a complex quantity comprising mineral heterogeneity, geometrical heterogeneity, weak grain boundaries, and micro-cracks. This study aims at investigating the effects of ore texture and loading displacement rate on minerals breakage mode. By knowing minerals breakage mode it is possible to identify the factors which affect minerals liberation and optimizing these factors in order to liberate minerals even in coarser size fractions. The approach is to describe the spatial displacement fields in different ore textures. In order to obtain these, in-situ compression loading tests with different displacement rates were conducted, followed by X-ray computed micro-tomography (XCT) and Digital Volume Correlation (DVC). In addition, the resulting cracks from ore breakage were analyzed and quantified in order to analyze the breakage mode. Moreover, XCT imaging was used for tracking the propagated cracks in the third dimension. For identifying mineral phases, automated scanning electron microscopy (SEM) complemented by energy dispersive spectroscopy was applied. The outcomes showed that both ore texture and loading mechanism should be considered for describing crack formation and consequently mineral liberation.

中文翻译：

---

通过空间变形定量分析表征矿石纹理裂纹的形成和释放

摘要 在粉碎过程中，颗粒的破碎始于裂纹的产生和扩展。裂纹路径定义了断裂模式，例如优先于相断裂或相界断裂。为了研究裂纹形成行为，可以应用位移场的描述。然后可以使用矿物相的位移场来了解破碎模式和解放。矿石质地和操作条件（例如加载机制）会影响系统。矿石结构方面的一个方面是矿石结构非均质性，它是一个复杂的量，包括矿物非均质性、几何非均质性、弱晶界和微裂纹。本研究旨在研究矿石质地和加载位移速率对矿物破碎模式的影响。通过了解矿物破碎模式，可以确定影响矿物解离的因素并优化这些因素，以便解离即使是较粗粒度的矿物。该方法是描述不同矿石结构中的空间位移场。为了获得这些，进行了不同位移率的原位压缩加载测试，然后进行了 X 射线计算机显微断层扫描 (XCT) 和数字体积相关 (DVC)。此外，对矿石破碎产生的裂缝进行了分析和量化，以分析破碎模式。此外，XCT 成像用于跟踪第三维中的扩展裂纹。为了识别矿物相，应用了自动扫描电子显微镜 (SEM)，并辅以能量色散光谱。