EUROPEAN STEEL TECHNOLOGY AND APPLICATION DAYS 2017 - ESTAD 2017

Flow Phenomena and mixing characteristics of the molten metal bath have been investigated according to the bottom bubbling gas conditions. The mixing time of the bath was affected from the location of gas bubbling plugs on the bottom of the ladle and numbers(from 1 to 3 plugs). For the same number of bottom bubbling plugs, the bottom bubbling in the center of the ladle showed the shortest mixing time. As increasing the distance between plugs, the mixing time of bath was increased. The location of bottom bubbling plugs contributed to the flow velocity. The plugs located to the close the ladle side wall interrupted the bath flow each other therefore, it led to the increase of mixing time. As increasing the number of bottom bubbling plugs, the mixing time of bath flow was decreased. For the number and location of bottom bubbling plug in the bath, the shortest mixing time was existed. For the case of changing the bottom bubbling flow rate periodically, the mixing time of bath flow was investigated. The periodic flow rate of the bottom bubbling also changed the mixing time in the case of using same bottom plugs. The short-periodic flow rate showed the decrease of mixing time compared with the normal bottom bubbling flow rate. When period of bottom bubbling flow rate got longer, the mixing time converged on the specific value. For the condition of periodic bottom bubbling flow rate, as total bubbling flow rate was increased, the mixing time was decrease, but the decreasing rate of mixing time was increased.