The 40 kg melt was degassed by two methods: Immersion of a degassing tablet in a melt by an immersion bell and an argon degassing through a lance with a porous plug. Up-gassing tablets were also used during the experiment. The method of double weighing was used for evaluation. No technically significant degassing was achieved using degassing tablets. After degassing with tablets was observed a decrease in DI (Dichte Index) value with increasing residence time. Excessive dosing of the tablet does not ensure a higher degassing effect, it only ensures a higher turbulence of the reaction. Preheating the degassing tablets before use does not affect degassing. By preheating the up-gassing tablets, their reactivity is reduced. Two immersion bells with different proportions were tested. The bells do not ensure a homogeneous dispersion of bubbles in the melt. By argon degassing through the porous plug, the melt was degassed to a value DI = 1,87 %. The consumption of argon for degassing smaller amounts of melt is higher than for degassing larger amounts of melt. Argon refining is more efficient than using tablets.
| Identifer | oai:union.ndltd.org:nusl.cz/oai:invenio.nusl.cz:416640 |
| Date | January 2020 |
| Creators | Spáčil, Ivo |
| Contributors | Záděra, Antonín, Kaňa, Václav |
| Publisher | Vysoké učení technické v Brně. Fakulta strojního inženýrství |
| Source Sets | Czech ETDs |
| Language | Czech |
| Detected Language | English |
| Type | info:eu-repo/semantics/masterThesis |
| Rights | info:eu-repo/semantics/restrictedAccess |
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