A Novel Method of Research on Dissolution Kinetics of Alumina in Mold Flux Based on Hot Thermocouple Technique

Abstract

Rotating cylinder method and confocal laser scanning microscope have been applied to the research on dissolution kinetics of alumina in mold flux. However, the former cannot observe in situ, and the latter has defects such as complex operation. Hot thermocouple technique can make up the deficiencies of the preceding methods. This paper explores the approach of researching dissolution kinetics of alumina in mold flux by the hot thermocouple technique. It verifies the correctness of experiments and explores the controlling means of the reproducibility of experiments. The results show that the effect of basicity on dissolution rate of alumina by hot thermocouple technique is similar to the consequence of the rotating cylinder method. The reproducibility of experiments is good when the diameters of alumina particles are less than 350 μm. The density of alumina particles used in experiments should be slightly bigger than the density of slag.