Optimization And Application On Bottom Argon Blowing Process With Double Plugs In A Baosteel Special Steel Ladle

With the development of steel making technology and relay on its advantage of high efficiency,low cost,easy to operate,the bottom argon blowing ladle has become the essential part of the production of special steel.Domestic and foreign researchers and many iron and steel companies are constantly improving the production process of ladle bottom argon blowing,and it has made great progress.In order to improve the ladle bottom argon blowing efficiency,and stable the temperature and composition uniformity with liquid steel,using numerical simulation and physical simulation experiment to conducted a study with bottom argon blowing,which is based on the 40 tons ladle in Baosteel Special Steel,the 1:3 model is made by the prototype ladle and made of plexiglass,and mainly discuss the ladle mixing time with different double purging position,the angle between double air brick,argon gas flow,slag layer thickness and so on.And the numerical simulation calculates the slag eye area with different stirring conditions,and combined with physical simulation results,it can verify the mutual validity of the model experiment,and can draw the flowing conclusions,which provide reliable process improvement to enhance the uniformity of the ladle stirring under current conditions.(1)When the double air bricks injection nozzle angle is 150 ° or 180°,the mixing time is relatively short.When the angle is 60°,the two column stocks interacted with each other,which results in the mixing time is longer than the others.(2)With double air bricks injection,the mixing time decreases as the blowing flow rate increase,but the decreasing trend eased slightly.(3)When the double air bricks injection angle is 180°,and under the same flow rate,the mixing time is relatively short.(4)With the same slag layer thick,the critical flow does not exhibit a simple multiple relationship.And the greater injecting angle,the greater the critical flow with double air brick.(5)By optimizing the angle of double argon brick and the flow ratio of argon gas,that is optimizing the angle from 90° to 150°and the argon blowing flow ratio is about 3:7.And in application,it can effectively improve the uniformity of molten steel's temperature and composition,enhance the efficiency of desulfurization,dehydrogenation,and denitrification,and reduce component retention rate.And there also has significantly improved in the ladle usage,ingots scraps,and inclusion control,which has played a very good application effect.