| 摘要 |
<p>This nozzle has as its object a reduction of the quantity of blowing gas to as small as possible in the bottom blowing of a molten metal refining furnace, and an increase in the control range of the quantity of blowing gas. This nozzle has a refractory body (1) with a plurality of through holes (2) leading from the used surface to the back surface thereof, a metal cover (3) surrounding part or all of the side surfaces of the body (1), and a pressure box (4) provided at the bottom of the body (1) and forming a space which communicates with the holes (2) and accumulates gas. When the pressure and quantity of the blowing gas is reduced, the molten metal does not enter the holes (2).</p> |
