| 摘要 |
1315894 Refining metals W VON HAUMEDER 19 April 1971 [5 March 1970] 23114/71 Heading C7D [Also in Division F4] A metal melt is covered with a foaming slag, part of the gases escaping from the melt are oxidized with a gas containing O 2 and cooling additives in a confined combustion zone above the melt to heat the additives, an O 2 -containing gas is discharged beneath the surface of the slag cover but above the melt surface to entrain slag, a further part of the exhaust gases and the additives above the melt surface as a liquid refining jet wherein a substantial part of the oxygen reacts to form liquid metal oxides and the jet is directed over substantially all the melt surface. The metal may be pig iron optionally mixed with scrap iron; the refining gas may be high purity O 2 ; which may be mixed with CO, CO 2 , CH 4 , natural gas or steam and the additives (e.g. sponge iron and/or iron ore)are preferably in the form of granules with a diameter not exceeding 5mm. The foamed slag maybe formed by directing jets of O 2 -containing refining gas, with entrained impurity-binding additives (e.g. particulate lime), towards the melt surface at an angle of at least 20 degrees from the vertical of the melt surface. The apparatus is also claimed (See Division F4). |
