| 摘要 |
PURPOSE:To protect the refractories in the bottom of a blast furnace and to extend the life thereof by forming the molten iron or slag deposits to be generated as a result of cooling on the surface of the lower peripheral wall in the furnace bottom and well which is in contact with a molten metal. CONSTITUTION:A block 1 provided with a hole 4 is used for the uppermost stage of the bedding of a carbon block 1 for the furnace bottom. A cooling gas pipe 3 is installed in the hole 4 and a nozzle 3b is provided thereto. The nozzle 3b is formed by combining an outside pipe 9 with an inside pipe 8 apart at a slight space therefrom and inserting the pipe into the hole 4 by using mortar 10, etc. Blowing of cooling gas through the nozzle 3 is started when a molten iron is produced after firing. When the rate of tapping begins to increase, the wear of the clay brick on the working surface side progresses and the brick is disloged. The molten metal around the nozzle 3b is thereafter cooled by the effect of the cooling gas and the deposit of the molten iron initiated by the working surface of the pipe 9 and the mortar 10 begins to be produced. The abrasion and accumulation in the deposit are balanced at certain thickness at the temp. and by the movement of the molten iron until finally the protective wall enclosing the block 1 is made. |
