The invention discloses a method for blowing a steel
ladle top
slag modifier by using CO2, which comprises the following steps: respectively crushing and ball-milling limestone fine ore and aluminum ash, mechanically and uniformly mixing the obtained
powder according to a certain proportion to prepare the steel
ladle top
slag modifier, and after tapping of a converter, spraying the prepared steel
ladle top
slag modifier and modified steel ladle top slag through a blowing device. The blowing device comprises a top-blowing spray gun arranged at the top of the steel ladle, CO2 is introduced into an inner cavity of the top-blowing spray gun to serve as carrier gas and stirring gas, a
refractory material layer is arranged at the end, inserted into the steel ladle, of a blowing head of the top-blowing spray gun, the top-blowing spray gun is controlled to ascend and descend through a lifting
control system, and the top of the top-blowing spray gun is connected with a discharging valve at the bottom of a
powder spraying tank through a discharging
pipe. The top of the
powder spraying tank is connected with a powder bin through a feeding
pipe. The modifier disclosed by the invention is prepared by crushing, ball-milling and mixing
industrial waste limestone powder and aluminum ash, the cost is low, and CO2 gas is adopted for injection, so that the problems of
molten steel splashing and slag and steel sticking at a steel ladle opening are avoided.