| 摘要 |
<p><PICT:0970990/C6-C7/1> Metals such as steel or cast iron are refined by blowing into a bath of the molten metal powdered additives which are discharged with a gaseous carrier medium from a reservoir 1 through an injection chamber 24, where the powder-gaseous carrier mixture undergoes turbulence, e.g. by means of compressed air supplied through a detachable injector 28, and through an atomizing chamber 31, where the flow of the mixture is accelerated by a stream of gas injected thereinto, e.g. through an orifice 32, to a velocity enabling the mixture to be injected by a lance (not shown) into the bath of molten metal, the gas feeding the reservoir and atomizing chamber, and preferably also the injection chamber, being provided by a single source at a uniform pressure, e.g. compressed air or other non-reactive gas through a duct 14 supplying a manifold 15 connected to a circular distributer 16 for the reservoir 1 and pipes 38 and 39 for chambers 24 and 31. As shown, the lower conical portion 2 of the reservoir, provided therein with material distributing cones 20, 21 and 22, is vibrated by a pneumatic vibrator 23, operated by the same gas supplied through a pipe 37 also connected with manifold 15. Pipes 17 and 18, terminating at different levels inside the reservoir, and perforated central column 19, connected to the cones 20, 21 and 22, are connected to the distributer 16. The discharge of the mixture from the reservoir is controlled by a disc 25 operated by a handwheel 26, the spindle of which bears a perforated baffle 27. The charging aperture of the reservoir is closed by a cover 5 secured by a handwheel 7 mounted on a hingeable yoke 6. The powdered additives may be injected into the molten metal in a melting furnace or being cast in ladles, and may be of a type effecting an initial deoxidizing and desulphurizing of the metal or a final desulphurizing respectively. With steel manufacture, iron-containing additives may be used, e.g. iron ore, pyrites ash, mill scale or other ferrous products, in a quantity which replaces that of externally supplied molten steel or scrap iron. The melting may be effected in an electric furnace, acid-lined converter or rotary kiln.</p> |
