It doesn't seem like too many people use furnaces for separation of consolidating their scrap. I have been using waste oil burners and simple furnaces to take the ally off steel and it works well. I have also done copper and am looking to build a brick furnace so I can melt things like alternators and starters etc so I can get the copper out of those. Oil heat and power make it pretty easy and of course it's a free fuel that can be put to good use and people are happy to be disposed of in a responsible manner.
You can see some of my burner setups and melts here:
https://www.youtube.com/user/glumpy10/videos
I see a lot of the doomsdayers save pennies for the copper, they would probably ship themselves if they saw all that copper in one place. Maybe you could get more for it selling it to the gloom and doomers than the scrap yard?
Bookmarks