An opening in metallurgical melting furnaces for discharging molten metal, matte, or dross.
An enterprise regulatory document for internal use, that sets production methods, technical means, technological standards, conditions, and detailed procedures for the technological process implementation.
A thermoelectric sensor of two dissimilar electrical conductors connected (usually metallic conductors, less often semiconductors).
The charge top layer in the furnace, which stays almost at the same level for the most of the process.