The melting technology of fused cast AZS block is divided with reduction method and oxidation method.
Reduction method is also called submerged arc method, it is the graphite electrode immersed in furnace charge, because the electrode burns under the environment of lack of oxygen, recover in a series of recover reaction, make the melt of some high oxide be in unstable form, together with carbon also enters the melt, this will eventually make the color of melt become dark.
In the process of ablation, the furnace charge of circuit of the burden were not carburizing or fused impregnation carbon decarburization before casting, this makes the melt contains no carbon technology, called oxidation method, also called Ming arc method. Because recovery method with the presence of carbon in AZS, when used in glass kiln, high-temperature charcoal burning, gas will squeeze soft glass phase out, speeds up the glass liquid on brick corrosion , so the existence of carbon on the corrosion resistance of AZS is bad, now more choose oxidation instead of recovery method, the history of charcoal in AZS is mainly graphite electrode during discharge not burning with arc into the furnace, so need to find a way to prevent the coal into the furnace. Here are several common methods:
Long arc method
The electrode does not melt in the furnace and eliminate the carbon transfer between the electrode and melt.
Join oxidizing agent method
Add some oxygen enrichment in ingredients material, it can release oxygen in the melting process, the molten liquid on the surface of carbon burned evaporation, however, usually is to use bright arc melting, with arc melting during refining。
Through oxygen method
Has many same ways, but oxygen blowing melt later after recovery melting. Some will lunge oxygen gun from the furnace top, some set of oxygen gun in the furnace mouth, make the furnace body forward to melt submerged drum oxygen lance, the melt of trace carbon burning escape by touch with oxygen.