I have tried this exactly once - much the same as demonwolf - but more crude. My "crucible" was a bean can with the lid laid on top and not sealed. The kingsford was pulverized, the butt plate wrapped in wire and suspended in the can. My furnace was a Weber kettle grill and the quench was rainwater circulated with the garden hose. I had a helluva lotta fun and was pleasantly surprised. Hopefully the link will show a short video clip............
https://www.dropbox.com/s/tgl4101cc6y6yan/Backyard%20CCH.wmv?dl=0

Regards, Joe