| 摘要 |
A molten metal treatment lance includes a refractory having at least one channel extending through the refractory. A first tubular member having two open ends is located in the channel of the refractory. The first tubular member has a side wall having an inner surface and an outer surface. A second tubular member having an open end and a closed end is positioned in the first tubular member. The second tubular member has a side wall having an inner surface, an outer surface and at least one opening extending from the inner surface of the side wall of the second tubular member to the outer surface of the side wall of the second tubular member. The second tubular member is positioned in the first tubular member so as to form a space between the inner surface of the side wall of the first tubular member and the outer surface of the side wall of the second tubular member. |
