Blowing lance tip, intended for bath stirring, comprising: - a central tube for supplying stirring gas, closed at an end turned towards the bath by a first front wall provided with at least two openings, - an internal tube forming with the central tube a first annular cavity for the passage of a cooling liquid and ended at one end turned towards the bath by a second front wall, called a separator, having a central opening and one passage orifice per opening provided in said first front wall, - an external tube forming with the internal tube a second annular cavity for the passage of the cooling liquid and closed at an end turned towards the bath by a third front wall having one outlet orifice per opening provided in said first front wall and having an internal surface comprising a tapered central area which is directed towards said central opening and which has a curved enveloped surface in axial section, - a heat exchange space in which the cooling liquid flows, which is located between, on the one hand, said separator and said third front wall and, on the other hand, said central opening and said second annular cavity, and in which the cooling liquid flows, and - an outlet conduit for the stirring gas, called an injector, leaving each opening in said first front wall and going as far as said corresponding outlet orifice passing through said corresponding passage orifice in a cooling liquid-tight manner, characterised in that said separator has an edge in axial section at the central opening which is curved such that a height is defined between a front of said edge and said third front wall and that in the heat exchange space a minimum predetermined height is present on the side of said central opening, such that the ratio H1/H3 is between 5% and 80%, advantageously between 5% and 75%, preferably between 5% and 70%, preferentially between 5% and 65%, particularly advantageously between 5% and 60%, preferably between 10% and 60%, advantageously between 15% and 60%, preferably between 20% and 60%, preferentially between 25 and 60%, particularly advantageously between 25% and 55%, preferably between 30% and 55%. - a central tube for supplying stirring gas, closed at an end turned towards the bath by a first front wall provided with at least two openings, - an internal tube forming with the central tube a first annular cavity for the passage of a cooling liquid and ended at one end turned towards the bath by a second front wall, called a separator, having a central opening and one passage orifice per opening provided in said first front wall, - an external tube forming with the internal tube a second annular cavity for the passage of the cooling liquid and closed at an end turned towards the bath by a third front wall having one outlet orifice per opening provided in said first front wall and having an internal surface comprising a tapered central area which is directed towards said central opening and which has a curved enveloped surface in axial section, - a heat exchange space in which the cooling liquid flows, which is located between, on the one hand, said separator and said third front wall and, on the other hand, said central opening and said second annular cavity, and in which the cooling liquid flows, and - an outlet conduit for the stirring gas, called an injector, leaving each opening in said first front wall and going as far as said corresponding outlet orifice passing through said corresponding passage orifice in a cooling liquid-tight manner,