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

本研究工作的目的是开发一种表征工具，用于冶金过程中发生的复杂高温固液结构，系统地研究允许/避免这种结构形成的机制，并确定潜在工艺实施的基本参数。为了达到这些目标，相互作用的熔融相的物理性质的知识是必不可少的。到目前为止，有关盐类化合物的性质还很少有系统的研究。首先使用实验方法的统计设计（DoE）定义盐混合物矩阵，然后测量物理性质密度、表面张力和粘度。第三步，将所选的盐混合物与“标准化的”（定义为氧化的）金属颗粒一起熔融，以确定悬浮液中所得的金属/盐截留。所有数据将用于验证一种新的相互作用模型盐-金属-氧化物，允许定义一个适当的工艺窗口。该项目选择镁盐系统，因为它具有实际意义，也是由于提案人的密集前期工作。在使用或制造返回的镁的盐熔过程中，在炉底形成盐、金属和陶瓷的三相悬浮物，即所谓的“黑渣”。到目前为止，由于没有进行基础研究，因此对其形成的理解以及最小化/避免是缺失的。

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.