After letting the core cure for several days I pulled the bucket out, or tried! It took quite a bit of work to remove the form from the core. Next steps I need to pull out the pvc from the drain hole and start the firing process.
This initial curing/firing schedule is unlike normal concrete curing. This initial firing is designed to allow for any water trapped to make its way out of the body of the furnace without cracking or spalling.
We will start by raising the temperature to about 200f and holding it. Then we will increase it by 200 degees per hour until we reach our goal of about 1800. At that point I will shut it down and try to cool it off as slowly as possible. If everything goes well in this initial firing, we should be good to go and can fire it up and start melting down aluminum, copper or brass to make into ingots.