Selective Comminution for Improved Liberation and Reduced Energy Usage

选择性粉碎以提高解放率并减少能源消耗

• 批准号: 216996-2013
• 负责人: Klein, Bernhard
• 金额: $ 1.82万
• 依托单位: University of British Columbia
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 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=637741
• 关键词: Selective; Comminution; Improved; Liberation; Reduced

The goal of comminution is to liberate minerals into discrete particles so that they may be upgraded during subsequent mineral separation processes. Comminution is energy-intensive and non-selective. The Canadian Mining Innovation Council has identified energy efficiency as a key strategic area for mining research. As an example, in provinces such as British Columbia, about 5% of the total electrical energy generated in the province is used by mining operations. Of this energy, comminution uses about 70%. Therefore research that will lead to more energy efficient comminution can have the greatest impact toward improving the energy efficiency of a mining system. Another issue is that comminution is not selective - the goal is to liberate the valuable mineral particles so that they can be separated. Grinding breaks all minerals and often leads to over grinding of soft mineral constituents, creating particles that are difficult to separate and under grinding of harder particles that are composed of valuable minerals and gangue that contaminate the product or lead to poor recoveries. Research at UBC has demonstrated significant energy savings of up to 34% by using novel High Pressure Grinding Roll and High Speed Stirred Mills Circuits. Also, results showed that by selecting operating conditions in stirred grinding mills some level of selectivity can be achieved. Furthermore, these conditions correspond to less energy usage. The objectives to the research are to develop the concepts of selective comminution to metallic sulphide ores by applying the theory relating stress intensities in stirred milling to particle breakage mechanisms. The research will be supported by studies relating rheology to interparticle interactions, relating breakage mechanisms to operating conditions using morphological fracture analysis and by mineralogical studies investigating the effects of the proposed novel comminution processes on liberation characteristics. The results support both lower energy usage and improved metal recoveries for the mining industry to improve profitability.

粉碎的目的是将矿物释放成离散的颗粒，以便在随后的矿物分离过程中对其进行升级。粉碎是能源密集型和非选择性的。加拿大矿业创新理事会已将能源效率确定为矿业研究的一个关键战略领域。例如，在诸如不列颠哥伦比亚省的省份中，该省产生的总电能的约5%被采矿作业使用。在这些能量中，粉碎消耗约70%。因此，将导致更节能的粉碎的研究可以对提高采矿系统的能源效率产生最大的影响。另一个问题是粉碎不是选择性的-目标是释放有价值的矿物颗粒，以便它们可以被分离。研磨会破碎所有矿物，通常会导致软矿物成分的过度研磨，产生难以分离的颗粒，以及由有价值的矿物和脉石组成的较硬颗粒的研磨不足，从而污染产品或导致回收率低下。UBC的研究表明，通过使用新型高压磨辊和高速搅拌米尔斯回路，可显著节省高达34%的能源。此外，结果表明，通过选择搅拌研磨米尔斯中的操作条件，可以实现一定程度的选择性。此外，这些条件对应于较少的能量使用。研究的目的是通过将搅拌磨中的应力强度与颗粒破碎机理相关联的理论应用于金属硫化矿的选择性粉碎的概念。这项研究将得到流变学与颗粒间相互作用相关研究的支持，使用形态断裂分析将破碎机制与操作条件相关联，并通过矿物学研究调查拟议的新型粉碎过程对解放特性的影响。结果支持采矿业降低能源使用和提高金属回收率，以提高盈利能力。