Characterization of the effect of micro-properties of rock on the correlation between Point Load strength index and comminution index tests

表征岩石微观特性对点载荷强度指数与粉碎指数测试之间相关性的影响

• 批准号: 484585-2015
• 负责人: Esmaeili, Kamran
• 金额: $ 1.71万
• 依托单位: University of Toronto
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=584407
• 关键词: Characterization; effect; micro; properties; rock

Mining is an energy intensive industry. The majority of the energy consumed in mining industry is used for rock breakage in order to liberate valuable minerals from the gangue. In order to improve the energy efficiency in a mining operation, it is of vital importance to understand the heterogeneity and spatial variability of comminution characteristics of an orebody that is feeding the mill. A lack of resolution in the orebody's comminution characteristics (i.e. grindability index) can lead to inappropriate mill design, resulting in increased energy consumption. This research project aims to investigate the quantification of the spatial variability of orebody geometallurgical characteristics through correlations between Point Load rock strength index and comminution index properties. The Point Load test (PLT) is a simple, portable and easy to repeat testing method for characterizing the rock strength property of ore samples throughout a mine. The PLT index has been shown to correlate to ore breakage characteristics, which are required for design and modeling of mills. More specifically, the current study aims to determine the influence of rock micro-properties (i.e. grain size, shape, foliation, etc.) on the correlation between the PLT strength index and the comminution characteristics of ore in milling process. The study will utilize geological, geotechnical and comminution data from nine gold mines operated by Kinross Gold. This diverse set of geological and geomechanical information will be subjected to a statistical analysis to study the potential relationships between fundamental rock fabric variables (e.g. isotropy, fractures) and rock breakage characteristics for the different mine rock types and properties. A numerical modelling approach using the discrete element bonded particle model (BPM) will be utilized to simulate comminution and PLT tests of intact rocks.

采矿业是能源密集型行业。采矿业消耗的大部分能源用于破碎岩石，以便从煤矸石中释放出有价值的矿物。为了提高采矿作业的能源效率，了解为磨机提供原料的矿体粉碎特性的异质性和空间变异性至关重要。矿体粉碎特性（即可磨性指数）缺乏分辨率可能会导致磨机设计不当，从而导致能耗增加。 该研究项目旨在通过点载荷岩石强度指数和粉碎指数特性之间的相关性来研究矿体地质冶金特征空间变异性的量化。点载荷测试 (PLT) 是一种简单、便携且易于重复的测试方法，用于表征整个矿山矿石样品的岩石强度特性。 PLT 指数已被证明与矿石破碎特性相关，这是磨机设计和建模所需的。更具体地说，当前的研究旨在确定岩石微观特性（即粒度、形状、叶理等）对PLT强度指数与磨矿过程中矿石粉碎特性之间相关性的影响。 该研究将利用 Kinross Gold 运营的九个金矿的地质、岩土和粉碎数据。这些不同的地质和地质力学信息将进行统计分析，以研究不同矿山岩石类型和性质的基本岩石结构变量（例如各向同性、裂缝）与岩石破碎特征之间的潜在关系。使用离散元粘合颗粒模型 (BPM) 的数值建模方法将用于模拟完整岩石的粉碎和 PLT 测试。