| 摘要 |
<p>PURPOSE:To provide a producing method of high cleanliness metal by making molten metal drips. CONSTITUTION:(1) In the producing method of a clean metal by passing the drips 3 of molten metal 9 through molten slag layer in a vessel having the atmospheric pressure adjusted to non-oxidization and absorbing inclusion in the molten metal 9 into the slag 4 to separate and remove the inclusion, before passing through the molten slag layer, the molten metal 9 is made to be fine drips by passing through a refractory-made porous nozzle 2, and also, after changing the form of the inclusion in the molten steel, the molten metal is dropped into the slag layer and made to be the drips to produce the high cleanliness metal. (2) The porous nozzle 2 used is the one having plural holes of 0.5-20mm the inner diameter and 5-100mm the length and <=5% apparent porosity of the refractory material and the composition composed of one or more kinds among 100% oxide of CaO, 100% oxide of SiO2, an oxide containing >=5% CaO and nitride containing >=5% CaO.</p> |
