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.

越来越多的新发达的沉积物的特征是复杂的矿物质成分和较低的有价值组件的含量。矿物颗粒通常更小，种植更加生，并且有价值的元素位于较大的矿石中。为了获得足够的解放，必须将矿石磨碎至较小的产品粒径。粉碎的能量需求随着较小的粒径而增加，以高度渐进的方式增加。选择性的粉刺可以显着降低这种能量需求。选择性粉碎导致沿晶界的首选裂纹传播和断裂，因此可以具有较大粒径的高度解放。或在一个或几个组件中产生优先的裂纹繁殖和断裂。这导致组件的粒度依赖性分布。通过随后的分类可以实现有价值和废物的分离。因此，选择性粉碎与简单的分类结合在一起，是一个非常有效的分离过程。对矿石及其成分的定量描述是有目的设计洞穴机器和利益过程的必不可少的基础。重要的矿石和岩石形成矿物的矿物学特性已充分记录。但是，关于各个矿物质的粉碎特性的知识很低，几乎没有研究晶界的特性。因此，研究项目的目的是系统地研究矿物质，尤其是晶粒边界的性质和腐烂行为。为了研究矿物质特性和机械应力下的裂纹传播的相互作用，将使用一个偏振矿石显微镜构建测试装置。该测试设备允许开发可靠生成棕榈QVIST裂纹的合适凹痕器。根据棕榈二维裂纹，研究了晶界的机械性能。与此相似，使用了各种矿物学方法，例如计算机断层扫描和定量微观结构分析。研究项目伴随着选择性粉刺的实验研究，用于微观水平上测得的特性与宏观水平的选择性粉碎行为之间的相关性。该研究项目提供了可靠的定量确定矿物质行为的方法，以及基于科学的粉碎机选择方法以及矿石利益中的洞穴过程的有目的设计。