metal together with the top blowing of oxygen jet injected through an oxygen lance so as to form an effective slag at an early stage of refining application_number US 15421780 A description take the case of using the conventional oxygen top blowing converter an oxygen jet may be supplied with a powder from a conventional oxygen top blowing lance but as noted above the supply of a powder into a high pressure oxygen piping unavoidably results in a high equipment cost therefore according to a preferred embodiment of this invention a separate path is provided for directing the powder on a carrier gas up to the tip of the oxygen blowing lance and for mixing the powder with an oxygen jet being delivered from the nozzle of the lance by so doing the defects mentioned above of the ld ac process can be eliminated without wearing down and altering the shape of the oxygen blowing nozzle more specifically a three sheathed lance four coaxial tubes used in one embodiment of this invention see fig1 is one example of such method the particle size of the powder may be in general less than 5 mm in diameter preferably less than 2 mm in diameter it is desired that the total amount of a given flux powder be supplied within about three quarters of the blowing period this is in order to dissolve the flux within the period of refining operation and rapidly form a reactive slag for effective refining operation the carrier gas for the flux powder is not specified and a suitable gas can be selected depending upon the composition and particle size of the flux the inside diameter of the piping the type and flow rate of the carrier gas or the type of the furnace used an.