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.

矿石矿床的几何特征的空间变异性可以显着影响采矿项目的经济，矿山计划，加工和废物管理。鉴于粉碎过程中使用的大量能量，对矿石沉积物几何特征的空间变异性有很好的理解可以高度优化采矿和加工活动中的能源消耗。需要大量测试来表征和描述矿体内的不同几何囊域。点载荷强度指数测试被广泛用于地质力学，是一项廉价的测试，可以在大量岩石样品和矿山工作人员本身上进行。该测试可以大量进行统计代表整个矿体。一些实验分析表明，点载荷指数测试可能与矿石断裂特性（降低重量测试，键工作指数等）相关，这是设计和SAG磨机建模所需的。其他研究表明，岩石的机械强度与矿石破裂特性之间的关系不佳，并表明岩石力学测试没有提供有关将磨削行为降至颗粒释放水平的信息。该研究项目的主要目的是确定岩石的微观和宏观特性如何（例如强度，矿物质组成，晶粒尺寸分布，微裂缝）在粉碎过程中会影响岩石的响应。