| 摘要 |
PROBLEM TO BE SOLVED: To provide an oxygen gas blowing lance which is highly durable and can be used more frequently than heretofore and contributes to the reduction of production cost and to provide a molten iron desiliconization method using the blowing lance. SOLUTION: The oxygen gas blowing lance is provided which is an oxygen gas blowing lance 1 for blowing the oxygen gas into molten metal, and which has a double tube structure composed of an inner tube 2 and an outer tube 3, wherein from the inner tube, the oxygen gas is blown, and from the gap between the inner tube and the outer tube, hydrocarbon-based gas is blown, and on the circumference of the outer tube near the gas discharge port 7, a formed brick layer 8 is arranged, and the outer circumference of the outer tube where no formed brick layers are arranged is covered with monolithic refractory 4. The desiliconization method is also provided in which the oxygen blowing lance is immersed into the molten iron, and from the inner tube of the blowing lance, the oxygen gas is blown into the molten iron and also, from the gap between the inner tube and the outer tube, the hydrocarbon-based gas is blown to oxidize and remove the silicon in the molten iron. COPYRIGHT: (C)2009,JPO&INPIT |
