What furnace wall lining is used for melting copper in an intermediate frequency induction melting furnace?

Use graphite crucible, because copper is a non-magnetic metal, so you need the circuit to heat the crucible, and then let the heat of the crucible melt the copper metal, choose the appropriate crucible size, put it in the middle of the furnace ring, with a gap of 5CM, and then wrap the inside of the coil A layer of insulation cloth, and then fill the quartz sand between the insulation cloth and the crucible, use a sharp object to solidify, and only need to solidify layer by layer. Aluminum-magnesium spinel ramming material can also be used to melt copper.