Method of introducing powdered reagents into molten metals and apparatus for effecting same

摘要

A method of introducing powdered reagents into a molten metal in a stream of carrier gas through a tuyere disposed in a refractory lining of a metallurgical vessel, consisting in that powdered reagents are introduced into a molten metal at a feed rate of 0.04 to 0.6 kg. per sec. under a pressure of carrier gas which is 1.8 to 4.0 times the static pressure of the molten metal above the tuyere, with the powder-to-carrier-gas ratio being 3 to 35 kg per cubic meter; and an apparatus for carrying the method into effect, which comprises a tuyere built in a refractory lining of a metallurgical vessel and accommodating in its interior a tube axially movable therealong and made up of separate sections each being smaller in length than the thickness of the refractory lining, and provided with a plug, a powdered reagent being introduced through said tube in a stream of carrier gas into the metallurgical vessel; there is positioned on the outside of the tuyere a feed device made in the form of a hollow cylinder mounted on its actuator operable to ensure butt-end connection of the hollow cylinder with the tuyere, and a pusher disposed within the hollow cylinder at the other butt end thereof, with a feeder being mounted substantially in the middle portion within the hollow cylinder and made up of at least two compartments of which one compartment accommodates tube sections and the other one plugs, the interior of the hollow cylinder communicating with the interior of the feeder to thereby provide for alternate feeding of the tube sections and plugs from the feeder interior to the interior of the hollow cylinder and their further pusher-actuated transfer into the tuyere.