| 摘要 |
<p>PURPOSE:To stably and surely float up and remove non-metallic inclusion in a molten metal by horizontally rotating the molten metal and guiding the metal to a float-up vessel after blowing gas through a gas permeable refractory provided on a suitable position therein. CONSTITUTION:To the molten metal charged in a rotary vessel 1 from a pouring hole 3, the horizontal rotating stream is given with a horizontal rotating magnetic field from a magnetic generator 4. Further, gaseous argon is blown therein. This gas blowing is executed through the gas permeable refractory blocks 5 embedded in the bottom face until 1/4 of a radius toward a center from the inside face of side wall in the rotary vessel 1 and/or in the flank until the range of 1/4 of the molten metal surface height from the bottom part of the flank. By this method, the gaseous argon is refined with strong shearing force at the max. velocity position in the vicinity of the flank in the vessel and floated up in the molten metal for long time, and colliding efficiency with the non-metallic inclusion in the molten metal is increased. Thereafter, the molten metal is guided into the float-up vessel 2 from a flowing hole 8. Thus, the fine gas bubbles catch the non-metallic inclusions and are floated up, and the inclusions are efficiently removed and the molten metal is cleaned.</p> |
