| 摘要 |
<p>PCT No. PCT/SU79/00025 Sec. 371 Date: Apr. 7, 1980 Sec. 102e Date: Apr. 7, 1980 PCT Filed: May 15, 1979 Pub. No. WO80/00364 Pub. Date: Mar. 6, 1980. An apparatus comprises a refractory-lined pipe (5) with a removable cover (6) formed with an opening provided to communicate the interior of the pipe (5) with a compressed gas supply system (8) and a vacuum system (9). This pipe (5) is arranged in a stepped conduit (4) of a tubular structure (3) from a refractory material. Positioned beneath the lower end of the pipe (5) and coaxially therewith on a stepped protection (10) of the wall of the conduit (4) formed in the structure (3) is a sleeve (11) from a porous material. Formed between the external side surface of the sleeve (11) and the wall of the conduit (4) is an annular space (12) confined from below by an annular cover (16) with an opening (17) for communicating the space (12) with a refining gas supply source (18).</p> |
