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Installation of Graphite Crucible

Installation of Graphite Crucible
First, before installing the Crucible, must check the furnace interior: The furnace wall and the bottom of the furnace should be intact, no metal or slag adhesion. If the furnace wall or hearth is attached with cement or slag, it must be cleaned. Otherwise the flame's advance will be hindered and the direction of flame deflection, resulting in the Crucible local heating excessive, in the crucible wall oxidation or produce small holes.
Second, the bottom of the Crucible support:
1. When installing the crucible, the bottom support of the crucible must be large enough and the cylindrical base, the base diameter must be at least the same as the bottom of the crucible, preferably slightly larger 2-3cm, and the base height is slightly above the fire mouth, thus preventing the flame from burning directly to the bottom of the crucible. The bottom material is quickly eroded, the crucible becomes tapered, or the crucible is cracked by uneven force at the bottom of the crucible.
2. In order to prevent the Crucible and the base adhesion, you can put a layer of insulation between the Crucible and the base (such as: fine refractory sand or cardboard.) )
3. When using the card Falcon base in the tilting converter, it is necessary to ensure that the bulge of the base and the groove of the Crucible are matched. If the base is raised too high or the size is too large, the bottom of the crucible will be squeezed, causing the bottom to rupture, and after dumping, the crucible cannot be effectively fixed.
4. When installing a tilting converter with long spout, it is necessary to provide a highly suitable base and fix the crucible support, if the base support is not suitable, such crucible will only be "hung" in the stove. The Crucible will break off from the top.
Third. The gap between the Crucible and the supporting bricks:
1. The gap between the crucible and the support brick is too small, the crucible will be blocked when heated and swollen, can be placed directly between the crucible and the top of the furnace wall supporting bricks (insert small wood chips or cardboard), after heating the crucible, the combustible material will burn out and leave enough space.
2. For the flue gas in the side exhaust furnace, the crucible and furnace wall can be sealed with insulation cotton, and then with high-temperature cement fixed. This can not only prevent the top of the ceiling is not fully sealed, but the crucible oxidation and cracking, and in the crucible heated upward expansion will not be blocked crack, but also to protect the role of heating wire.
(Note: It is recommended that the furnace cover be used to prevent the oxidation of the crucible, the top cracking and corrosion.) The inner edge of the furnace cover is covered with 100mm of the inner surface of the crucible, which can better avoid the crucible being impacted by external force and oxidized. )
3. In the tilting converter, the crucible should be in the position of half the height of the crucible, with a piece or two block of supporting bricks fixed under the sprue. Cardboard should be placed between the crucible and the support brick to preserve enough space to prevent the crucible from expanding.