We did this years ago by accident. I was working for the local cable company more than 20 years ago, and we were tasked with cleaning up an area after a recent rebuild. There were dozens and dozens of those big woden cable spools. Some of them had dead ends of cable on them. We spent all day out there doing stuff and we had a fire going. We rolled a couple of spools on at a time to burn. Later in the day there was a little river of aluminum pouring out of the fire and puddling on the ground outside of the fire.
The next day I was able to pick up one of these "ingots" and drove it to the scrap yard for the heck of it. I don't remember how much I got for it exactly, but it surprised me and I brought as many clean pieces as I could find the next day and we had enough for a few cases of beer. there were some pieces that had nails sticking out, etc. I held on to that an intended to make a furnace of sorts to remelt it and clear it of the nails, but never got around to it.
They did take it and it looked pretty cool, but would not be worth the fuel expense to do that. The end user is going to do that to it anyway.
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