Investigation of scientific basics of Selective Comminution concerning mineralogical and technological properties of raw materials

有关原材料矿物学和技术特性的选择性传播的科学基础研究

• 批准号: 429570010
• 负责人: Professor Dr.-Ing. Holger Lieberwirth
• 金额: --
• 依托单位: Institut für Physikalische Chemie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2020
• 资助国家: 德国
• 起止时间: 2019-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/429570010?language=en
• 关键词: Investigation; scientific; basics; Selective; Comminution

More and more new developed deposits are characterized by a complex mineralogical composition and lower contents of valuable components. The mineral grains are often smaller, more intergrown and the valuable elements are located in larger variety of ore minerals. For a sufficient liberation, the ores must be ground to a smaller product particle size. The energy requirement for comminution increases with a smaller product particle size in a highly progressive manner. This energy requirement could be significantly reduced by Selective Comminution.Selective Comminution leads either to a preferred crack propagation and fracture along the grain boundaries and thus allows a high degree of liberation with a large particle size. Or it produces a preferential crack propagation and fracture in one or several components. This results in a particle size-dependent distribution of the components. The separation of valuable and waste can be achieved with a subsequent classification. Thus, Selective comminution is, in combination with a simple classification, a very efficient separation process.A quantitative description of the ores and its constituents is an essential basis for the purposeful design of comminution machines and beneficiation processes. Mineralogical properties of the important ore and rock forming minerals are well documented. Knowledge on comminution properties of individual minerals, however, is low and the properties of grain boundaries are hardly investigated. The aim of the research project is therefore to systematically investigate the properties and the comminution behavior of the minerals and especially the grain boundaries. In order to investigate the interaction of mineralogical properties and crack propagation under mechanical stress, a testing device will be constructed with a polarization ore microscope comprising an interchangeable indenter.The testing device allows the development of a suitable indenter for the reliable generation of Palmqvist cracks. On the basis of the Palmqvist cracks, the mechanical properties of the grain boundaries are investigated. Parallel to this, various mineralogical methods such as computer tomography and Quantitative Microstructural Analysis are used. Experimental investigations on Selective comminution accompany the research project and are used for correlations between the measured properties on the micro level and the Selective comminution behavior in the macro level. The research project provides methods for the reliable quantitative determination of the comminution behavior of the minerals as well as methods for the science-based selection of comminution machines and the purposeful design of the comminution processes in ore beneficiation.

越来越多的新开发矿床具有矿物组成复杂、有价组分含量低的特点。矿物颗粒往往较小，更多的共生，有价值的元素位于更多种类的矿石矿物。为了充分释放矿石，必须将矿石磨成较小的产品粒度。粉碎的能量需求以高度渐进的方式随着产品粒度的减小而增加。选择性粉碎可以显著降低这种能量需求。选择性粉碎导致沿晶界的首选裂纹扩展和断裂，从而允许具有大粒度的高度解离。或者在一个或几个部件中产生优先裂纹扩展和断裂。这导致了组分的颗粒大小相关分布。有价值和废物的分离可以通过随后的分类来实现。因此，选择性粉碎与简单分类相结合，是一种非常有效的分离过程。矿石及其成分的定量描述是有目的地设计粉碎机和选矿工艺的必要基础。重要的矿石和造岩矿物的矿物学性质有很好的记录。然而，对单个矿物的粉碎性质的了解很少，而且对晶界的性质几乎没有研究。因此，研究项目的目的是系统地研究矿物的性质和粉碎行为，特别是晶界。为了研究在机械应力作用下矿物学性质与裂纹扩展的相互作用，将构建一个带有可互换压头的偏振光矿显微镜测试装置。该测试装置允许开发合适的压头，以可靠地产生Palmqvist裂纹。在Palmqvist裂纹的基础上，研究了晶界的力学性能。与此同时，还使用了各种矿物学方法，如计算机断层扫描和定量显微结构分析。选择性粉碎的实验研究伴随着研究项目，并用于测量微观水平上的性能与宏观水平上的选择性粉碎行为之间的相关性。该研究项目为矿物粉碎行为的可靠定量测定提供了方法，为科学选择粉碎机械和有目的地设计选矿粉碎工艺提供了方法。