Characterizing the effect of micro and macro heterogeneity of rock on its comminution behaviour

表征岩石微观和宏观非均质性对其破碎行为的影响

• 批准号: 500310-2016
• 负责人: Esmaeili, Kamran
• 金额: $ 1.72万
• 依托单位: University of Toronto
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=618137
• 关键词: Characterizing; effect; micro; macro; heterogeneity

The spatial variability of geometallurgical characteristics of an ore deposit can significantly influence the economic, mine planning, processing and waste management of a mining project. Given the significant amount of energy that is used in the comminution process, a good understanding of spatial variability of geometallurgical characteristics of an ore deposit could highly optimize the energy consumption in the mining and processing activities. Large numbers of tests would be required to characterize and delineate different geometallurgical domains within an ore body. The Point Load strength index test is widely used in geomechanics and is an inexpensive test that can be conducted on a large range of rock samples and by the mine staff themselves. The test can be carried out in a large quantity to statistically represent the entire ore body. Some experimental analyses have shown that the Point Load Index test could be correlated with the ore breakage characteristics (drop weight test, Bond Work index, etc.) which are required for design of crushing and SAG mill modelling. Other investigations have shown poor relationships between the mechanical strength of rock and the ore breakage characteristics and indicated that the rock mechanics tests do not provide information regarding grinding behavior down to the particle liberation level. The main objective of this research project is to determine how the micro- and macro- properties of rock (e.g. strength, mineralogical composition, grain size distribution, micro-cracks) can influence the response of rock during the comminution process.

矿床地学特征的空间变异性对采矿项目的经济、矿山规划、加工和废物管理具有重要影响。考虑到在粉碎过程中使用的大量能源，对矿床地质特征的空间变异性的良好理解可以高度优化采矿和加工活动中的能源消耗。需要进行大量的试验来描述和描绘矿体内不同的地质冶金域。点荷载强度指标试验在地质力学中得到了广泛的应用，是一种成本低廉的试验方法，可以在大范围的岩石样品上进行，也可以由矿井工作人员自己进行。该试验可以大量进行，以统计地代表整个矿体。一些实验分析表明，点载荷指数试验可以与破碎特性（落重试验、粘结功指数等）相关联，这是设计破碎和SAG磨机模型所需要的。其他研究表明，岩石的机械强度和矿石破碎特性之间的关系很差，并表明岩石力学试验不能提供关于磨矿行为的信息，直到颗粒释放水平。本研究项目的主要目的是确定岩石的微观和宏观特性（如强度、矿物组成、粒度分布、微裂纹）如何影响岩石在粉碎过程中的响应。