誘導溶解炉で銅を溶解するために鉄るつぼを使用できますか？

You can choose graphite crucible for melting copper in 誘導溶解炉, or you can buy induction furnace ramming material yourself, and directly ram the furnace wall lining on the furnace wall to directly smelt copper. It is definitely not possible to use an iron crucible.