Techni Te chni cal Information 27 Altt ern Al er n ati at i ve Tun Tu n d i s h L adl ad l e Desi Des i g n The tundish cover process may be designed to suit a range of different foundry conditions. Examples are fixed lid, automatic lifting or manual removable lids. Low levels of fume and smoke will escape from the tundish vessel, giving a good foundry environment. The figures below shows some alternative ways of designing tundish cover ladles with fixed and removable lids. A fixed lid requires an alloy charging port for introduction of MgFeSi-alloy. Ladles with fixed lid can generally not be deslagged, and therefore slag accumulation may be a problem. Hence, low slag forming alloys (low Ca and Al) are recommended for such ladles. The tea pot ladles offers an advantage in that liquid iron can be filled through the tea pot spout. This means that the tundish cover basin is eliminated. Both fixed and removable lids can be applied for teapot ladles. Teapot ladles will generally supply cleaner metal into pouring ladles and autopours due to the slag skimming effect of the spout. The lifting or removable tundish cover design is probably the most flexible and easiest to maintain. Lifting covers can be either integrated to the ladle with a separate lifting lug or El k em ASA, Fo u n d r y Pr o d u c t s Po s t al ad d r es s P.O.Box 5211 Majorstuen NO-0302 Oslo Norway Of f i c e ad d r es s Hoffsveien 65B Oslo Norway © Co p y r i g h t El k em ASA Tel ep h o n e +47 22 45 01 00 Tel ef ax +47 22 45 01 52 Web www.foundry.elkem.com Or g . n o . NO 911 382 008 MVA Rev i s i o n No. 1.1 20.03.2004 Tec h n i c al In f o r m at i o n 27 2 constructed as a fully removable lid by using for instance a fork lift truck. The lid can also be mounted onto the furnace spout. The major advantages with removable lids are easy access to deslagging and cleaning of the ladles and also that the same lid can be used for several ladles. Charging of MgFeSi-alloy is also easier when the lid is removed from the ladle top. For more information about tundish ladle treatments, please refer to Elkem Technical Information sheets 9, 10, and 11, and also 20 and 21 for selection of alloys and heat conservation.
