| 摘要 |
<p>PURPOSE:To prevent the furious rippling on a molten metal surface and to reduce the amount of the sludge coming out, by making the submerged part of a revolving cooling body under the surface of a molten metal in such a way that the upper part of the submerged part is expanded downwards so as to be a downward guiding part for molten metal. CONSTITUTION:A specified amount of melted Al 4 is put in a crucible 1, and the revolving cooling body 2 is submerged so as to position the molten metal surface at the place between the upper end and the max. diameter part 2a of the revolving body 2 so that the part between the upper end and the max. diameter part 2a works as the downward guiding part 6 for the molten Al. And the inner peripheral part of the part between the upper end and the max. diameter part 2a is covered with an insulating material 7. Then, the revolving cooling body 2 is revolved while a cooling liquid is supplied to the inner part of the revolving cooling body 2 with the result that an Al nodule I of high purity is formed on the outer peripheral part lower than the max. diameter part 2a. At this time, downward streams are generated along the direction as shown by arrow A to prevent the furious rippling on the molten metal surface and the sludge consisting of Al2O3 produced by the reaction between Al and O2 in the air is reduced.</p> |
