Study On Dispersed Phase Distribution In Continuous Phase In Steelmaking Converter

In most metallurgical reaction systems, the overall reaction rate between dispersed phase and continuous phase has no relationship with its chemical kinetics, but is determined by the physical condition. So in order to accelerate mass transfer, the bath is often made emulsive. In order to determine the reaction rate in this kind of system, the surface area of the dispersed phase must be obtained, but the commonly used Euclidean geometrical method to calculate the interface area is hardly accurate.Based on the similarity theory, the mixing behavior of molten slag and steel in a steelmaking converter is simulated with water model. The photos of the slag-metal interface changes are taken with a digital camera. After the photos are processed with program developed by the author, the textural fractal dimension of slag-metal boundary, the box fractal dimension, and the size & coordinate distribution of dispersed phase are studied with fractal dimension theory. At last, the interface area of slag-metal is calculated in this paper.The interface between dispersed phase and continuous phase is of great roughness and even fragmentary because of turbulence. The distribution of dispersed phase is discontinuous or continuous but non-differentiable. The fractal dimensions are used to describe the variation of dispersed phase distribution and slag-metal interface in this paper. The results show that the distribution of slag has obvious fragmental region and distortion region in top-blowing process. So the combined blowing process can get better mixing effect than top-blowing process.The textural fractal dimension of slag-metal boundary and box fractal dimension of dispersed phase in different kind of blowing conditions are calculated in this paper. The results show that the textural fractal dimension is the important parameter to evaluate the roughness of slag-metal interface. The textural dimension is increased with the increase of gas the flowrate, lowing of lance position and decrease in the slag-metal ratio, while the gas flowrate is the decisive factor. The box fractal dimension of dispersed phase is the important parameter to evaluate the mixing condition of slag-metal. The greater the box fractal dimension of dispersed phase is the more intensive is the emulsification between slag and metal. The experimental relationships of the...