The Study Of Bubbles Floating Up To Remove Inclusions Through Physical Simulation

Air bubbles in water play an important role in many fields.there are related studies about bubbles go up to the mixed in many areas.The interaction between bubbles and particles behavioral research initially lies mainly in flotation in mineral processing.Later,the metallurgical industry,the pharmaceutical industry,rivers and lakes,water purification have related research.In the metallurgical industry,the content of non-metallic inclusions is one of the important indicators to measure the quality of steel.The main non-metallic inclusions in molten steel,silica and alumina all have a large contact angle,So the solution is easily trapped by air bubbles during bubble rising.The way in which the bubbles bubble up in the molten steel can only be simulated and studied theoretically.At present,there are two ways for bubbles to remove inclusions:the collisions between small bubbles and particles form a dynamic three-phase aggregation group,and the large bubbles or bubble groups rise up to form wake area to entrap particles to drive floating.Previous studies on the adhesion behavior of small bubbles and particles mainly focused on the effects of bubble size,particle size,particle contact angle and air blowing rate on the adhesion of bubbles.However,there are few researches on entrained particles in the wake of large bubbles.In this study,the factors of entrainment of the wake of the bubble are as follows:the distance between the particle and the bubble at the beginning of the wake region,the size of the bubble and the particle size,the bubble,the solution temperature,the viscosity of the solution and the bubble surface tension coefficient.The subject study that bubble remove inclusions through high-speed camera by physical experiments.Image pro plus 6.0 to deal with the picture to obtain the relevant parameters and to make the bubble and particle velocity changes with time map and the particle is driven by the height of the map to analyze the various factors on the wake of the bubble entrained particles.The main results are concluded as follows:(1)In the experiment of adhesion between bubbles and particles,the smaller the bubbles are,the less the bubble and particles adhere to the bottom of the bubbles,and the collision time between bubbles and particles is longer than the adhesion time between bubbles and particles.(2)In the experiment of entrained particles in the wake of the bubble,the larger the bubbles are,the larger distance particles are driven in the X-axis and the Y-axis,the greater average rising velocity in the wakes.The unit volume bubbles drive particles higher when bubble smaller.(3)For the continuous bubbles,the distance between the second phase and the Y-axis in the second-stage wake is larger than that in the first-stage and the Y-axis is larger than the X-axis.In addition,the average velocity of particles in the second phase is also larger than the first phase of the particles.(4)The difference of temperature in this experiment has no effect on the entrainment effect of bubble entrainment particles.When the solution viscosity is larger,the average velocity of particles in the wake area is smaller and the particles are driven in the direction of X-axis and Y-axis The smaller the distance.The larger the surface tension coefficient in solution,the more the bubble tends to be spherical.The velocity in the Y-axis direction of the particles is larger in the wake area,and hence the height driven in the Y-axis direction is higher but the X-axis direction is not significantly affected.