Refractory lining design and steel practice for low refractory waste, and refractory based on reclaimed low-impurity magnesia-carbon aggregate

A method of producing low-impurity Magnesia-Carbon reclaimed aggregate, comprising:

• assembling a refractory with a backup lining comprising at least one of magnesium oxide-based brick, or aluminum oxide-based brick, or aluminum oxide-based monolithic and a working lining with at least one surface of the working lining adjacent to the backup lining, wherein the working lining comprises Magnesia-Carbon, and wherein assembling the refractory includes forming a gap between the backup lining and the working lining;
• filling the gap with magnesia based backfill;
• exposing the working lining to a metal making high temperature process;
• sequentially demolishing the working lining, and separating the Magnesia-Carbon brick;
• and
• producing low impurity Magnesia-Carbon reclaimed aggregate from the separated Magnesia-Carbon brick, the reclaimed aggregate suitable for reuse in production of high purity Magnesia-Carbon refractory.