| 摘要 |
PURPOSE:To efficiently recover free graphite by a simple method by sucking away the graphite content on the surface of a molten metal by the negative pressure generated from the high-velocity gaseous flow of an inert gas and putting the periphery of a suction part in an inert gaseous atmosphere. CONSTITUTION:Gaseous N2 4a is ejected from a nozzle 4 to a conduit 5 and slag 3 contg. the free graphite existing on the surface of the molten iron 2 in a molten iron pan 1 is sucked through an aperture of a suction pipe 6 communicating with the conduit 5 by the negative pressure generated by the ejection of the gas. An approximately toric header pipeline 7a to which the gaseous N2 is supplied from a pipe 7 is provided to the outside periphery of the suction pipe 6 and the gaseous N2 7b is injected approximately horizontally with the liquid surface of the molten iron from the slits bored to the lower part of the pipeline 7a over the entire, periphery thereof. The periphery of the aperture of the suction pipe 6 is thereby placed in the gaseous N2 atmosphere. The suction of the air arising from the suction of the slag is thus prevented and the recovery of the free graphite in the sucked slag is made possible without burning the same. |
