Abstract: Granulation device comprising means for heating a material to be granulated in order to cause its melting and means for supplying the molten material to a container (1) terminated by an orifice (9) for spraying the material in the form of droplets at the entrance of a cooling housing wherein the droplets solidify into granules. Said container comprises on at least one portion of its inner wall raised helical elements imposing a helical blade-type circulation to the molten material, said helical elements (5,6,7) being comprised of grooves provided in a generally cylindrical part (4) which is housed without any clearance into a cylindrical portion of said container (1).

Abstract: The refining additive is an alloy in the form of granules of a metal selected from the group of alkaline earth metals and zinc with a small quantity of a metallic element capable of giving the alloy a substantially lower melting point. The alloy can be a eutectic alloy.This alloy, which is in the form of granules, allows the treatment of steels, cast iron and non-ferrous metals at lower temperatures and with a substantial reduction in bubble formation.The alloy may be introduced in the form of a core wire.