I was melting down some aluminum scrap today and some of it included some old ram heat sink with the bga's stuck on some of them. Most of the aluminum was not clean and I was burning off all the impuritys. Had about 10lbs of scrap that ended up being less then half that after brining it all off, not counting the slag in the crucible, witch it will re burn and try and get some moire out of it.

So I had the foundry running, the fire bricks were bright orange dim yellow and the crucible was bright red (about 1500f) and the blasted ram BGA's would not burn off. I had to scrape then out of the crucible. They were floating on red hot molten aluminum.

Who would have thought they could handle that kind of temps before burying? Any one know what there made of?