Efficient composite desulfurization agent, preparation method and applications thereof

The present invention provides an efficient composite desulfurization agent, a preparation method and applications thereof, wherein the efficient composite desulfurization agent comprises, by mass, 65-75% of quick lime, less than or equal to 10% of limestone, 5-10% of soda ash, less than or equal to 10% of fluorite, and less than or equal to 5% of graphite. According to the present invention, the premix, ie., the composite desulfurization agent, is transported by a tank car and is subjected to pressurization conveying to a desulfurization agent bin, and during the desulfurization treatment, the desulfurization agent is introduced into a spraying-blowing tank from the desulfurization agent bin, and is pressurized, and the pressurized desulfurization agent is sprayed into liquid iron in a spraying-blowing manner so as to perform desulfurization; and compared to the unimproved Baosteel steelmaking plant torpedo car desulfurization agent, the efficient composite desulfurization agent of the present invention has