The Removing And Controlling Of Fine Inclusions In TMBP

Along with the rapid development of steel industry, people have more concern about health and environment. So we should produce higher quality steel to meet with the requirements of people’s daily life. Both in the daily life and the producing process, the demand for iron packaging products is increasing year by year. TMBP has advantages in the packaging industry due to non-toxic, corrosion resistance, high strength, good ductility and many other qualities. Therefore, the demand is increasing all over the world. However, the existence of micro inclusions in TMBP is a common problem and restricts its development and production. So that we should research and solve these problems by combining it with the actual production. Only through continuous improvement can we get the best quality of TMBP.This paper aims at the removal and control of micro inclusion in a domestic steel plant. Disposing the liquid steel in tundish and LF ladle furnace is to improve the quality of TMBP. Establish mathematical and physical model is to do theory analysis through the collision and gather to rise of the micro inclusions. By recording the rise time of different inclusions and citing the fractal dimension theory and linear fitting method, we can deduce the fractal dimension of inclusions under different morphology. Finally, we work out the floatation speed in the floating course, then analyze the relationship between inclusion size, shape, fractal dimension, blowing argon flow and the floatation speed.The experiment results show that in original tundish, the inclusions’ removal rates of the diameter of 20μm, 50μm, 80μm are 7.0%, 35.2%, 70.4%, the tundish nozzle into microscopic inclusions removal rate is 66%. Respectively, after optimization the inclusions’ removal rates are increased to 26.8%, 50.7%, 85.9%, the microscopic inclusions removal rate is increased to 75%; In the quality and the fractal dimension of the same case under the water wetting angle respectively 91° of the polyethylene 118° of the polyethylene 180° of the drift beads, the floating in the water and among the same velocity, has nothing to do with the angle; Under the same condition, the smaller the particle size of argon bubble is, the higher the probability captures the inclusion particles and vice versa; Under the condition of monomer inclusions with the same volume, the bigger the fractal dimension is, the greater the floatation speed, condensed inclusion has relationship with its basic particles and fractal dimension; the main engine of inclusion particles to collision reunion is the lyophobic forces caused by the non-wettability in the steel liquid.