I built my own metal melting furnace thinking the same thing. Clean metal -- more money; doesn't work that way.
Melting Aluminum is a waste of time unless you are going to cast a product of sorts, ie. figurines, cosplay/prop weapons, machine parts, ex…
Melting copper or brass looks cool and is entertaining, but from what I’ve experienced, most scrap yards won’t buy ingots due to their unknown composition and alloys. These are best sold as curiosities or cast into a final product same as Au.
Better than scrap is the only way to make a metal melting furnace cost effective.
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