ABSTRACT

To accurately estimate the separation effects and breakage characteristics of coal and gangue particles (CGPs), it is of great significance to understand the meso-morphologies of CGPs and their correlations with different crushing conditions. In the present work, the impact crushing tests were conducted to obtain the effects of sizes, gangue mixture ratios, and crushing velocities on the fractal characteristics of the crushed PSD characteristics, using an in-house designed device. Then, X-ray computed tomography (XCT) scanning with different resolutions was conducted on uncrushed and crushed CGPs, followed by a series of image processing and analysis procedures. Finally, the effects of different impact velocities on the evolution of morphological parameters, the fracture ratios, and the fractal fragmentation characteristics were investigated using different image processing algorithms. Results show that many factors such as the energy consumption, the source of raw ores, the impact velocity, and the feeding particle size should be considered to design an optimal crushing scheme for best crushing effects.

摘要

为了准确估计煤矸石颗粒（CGPs）的分离效果和破碎特性，了解CGPs的细观形态及其与不同破碎条件的相关性具有重要意义。在目前的工作中，使用内部设计的设备进行了冲击破碎试验，以获得尺寸、脉石混合比和破碎速度对破碎 PSD 特性的分形特性的影响。然后，对未粉碎和粉碎的 CGP 进行不同分辨率的 X 射线计算机断层扫描 (XCT) 扫描，然后进行一系列图像处理和分析程序。最后，不同冲击速度对形态参数演变的影响，断裂比，并使用不同的图像处理算法研究了分形碎片特征。结果表明，在设计破碎效果最佳的破碎方案时，应综合考虑能耗、原矿来源、冲击速度、给料粒度等多种因素。