The invention discloses a rotary blowing desulphurization spray gun applicable to molten iron jars of various dimensions or various desulfurizing agents. The rotary blowing desulphurization spray gun comprises a connecting
flange, a connecting section spray gun body, a gun body section spray gun body and a spray gun section; a plurality of rotating blades are arranged on a main
pipe of the spray gun section and the outer wall of a reinforced
pipe; each rotating blade comprises a blade
metal core; a plurality of inner
insertion type spraying pipes are arranged on the side wall of the bottom of the main
pipe symmetrically; each inner
insertion type spray pipe penetrates through the corresponding blade
metal core; a
graphite sleeve is arranged on the outer wall of each inner
insertion type spray pipe of the corresponding blade
metal core. By means of the spray gun, in the blowing desulfurization process, the ascent time of the desulfurizing agents is prolonged, and the ratio of bubbles which are penetrated through is increased substantially, the mixing time of a
molten pool is shortened remarkably, the desulphurization dynamics conditions of a desulphurization reaction are improved remarkably, the undulation of the liquid level of molten iron is reduced, and therefore the spray gun can be used for blowing desulphurization of the various desulfurizing agents and the molten iron jars of various dimensions.