It isn't pure aluminum. Here's an ordinary family with a firepot cobbled together, using 50 lbs of self-starting BBQ charcoal to melt about 30 lbs. of aluminum scrap and pour it in an anthill. These anthill castings, of which there are hundreds you can see online, demonstrate how easy it is to melt a lot of aluminum, how much it flows, how it can be done without setting everything around on fire.
It isn't pure aluminum. Here's an ordinary family with a firepot cobbled together, using 50 lbs of self-starting BBQ charcoal to melt about 30 lbs. of aluminum scrap and pour it in an anthill. These anthill castings, of which there are hundreds you can see online, demonstrate how easy it is to melt a lot of aluminum, how much it flows, how it can be done without setting everything around on fire.
https://www.youtube.com/watch?v=dBxgb2yYqCU