Features of service of the lining of a crucible induction furnace in melting of cast iron

Conclusions

It has been established that a feature of lining service at the metal-slag-lining-gaseous atmosphere interface of a furnace is overgrowth of it with the products of reaction of the refractory with the molten metal and slag.

A mineralogical analysis of the quartz lining showed that overgrowth of it in the area of contact of it with the gaseous phase is a complex process consisting of a number of successive stages: wetting of the lining by the reaction products; occurrence at the metalslag-lining-gaseous atmosphere interface of the furnace of oxidation-reduction reactions; formation on the interface of a reaction zone consisting of the products of reaction of the refractory with the molten metal and slag; crystallization of the reaction products leading to formation of beads of metal in the reaction zone. To decrease overgrowth of a crucible induction furnace lining special measures such as changing the composition of the slag, selection of the optimum temperature conditions at the boundary of interaction, electrochemical protection, etc., are necessary.