Impact of thermo-physical properties on three-phase-interactions of molten salt, liquid metal and non-metallic inclusions

这项研究工作的目的是开发一种表征冶金过程中出现的复杂高温固液结构的工具，系统地研究允许/避免这种结构形成的机制，并为潜在的过程实施确定基本参数。为了达到这些目标，相互作用的熔体的物理性质的知识是必不可少的。到目前为止，相关盐类化合物的性质还没有得到系统的研究。首先用统计设计法(DoE)确定混合盐基质，然后测量其物理性质密度、表面张力和粘度。第三步，将选定的盐混合物与“标准化的”(定义为氧化的)金属颗粒熔化在一起，以确定悬浮液中所产生的金属/盐夹带。所有数据将用于验证新的盐-金属-氧化物相互作用模型，以确定适当的工艺窗口。本项目选择镁-盐系统，因为它具有实际意义，也是因为提出者进行了密集的前期工作。镁盐熔炼过程中，炉底形成盐、金属、陶瓷三相悬浮物，即所谓的“黑渣”。到目前为止，对它的形成和最小化/避免的理解还缺乏，因为还没有进行基础研究。

The aim of this research work is to develop a characterisation tool for complex high temperature solid-liquid structures occuring in metallurgical processes, to systematically investigate the mechanisms which allow/avoid this structure formation and to identify the basic parameters for a potential process implementation. In order to reach these targets, the knowledge of physical properties of the interacting molten phases is essential. Up to now, the properties of the relevant salt compounds have too little investigated systematically. At first a salt mixture matrix is defined using statistical design of experiment method (DoE), followed by measuring the physical properties density, surface tension and viscosity. At third selected salt mixtures will be melted together with “standardized” (defined oxidized) metal particles in order to determine the resulting metal/salt entrapment in the suspension. All data will be used for validation of a new interaction model salt-metal-oxide allowing for the definition of an appropriate process window.This project selects the magnesium-salt system, as it has practical relevance and also due to the intensive preliminary work of the proposer. During salt melting of magnesium returns from use or manufacturing, a three-phase-suspension of salt, metal and ceramics is formed at the furnaces bottom, the so-called "black dross". Up to now the understanding of its formation and thus is minimisation/avoidance is missing, as no fundamental research has taken place.