It's hard to explain but I couldn't get the aluminum to melt correctly tonight. I first loaded up a crusible and all the aluminum melted as before with no problems. I skimed off the dross and added additional aluminum to the melt. When I checked back on the melt is appeared that aluminum had "foamed up". That's what it looked like when looking down into the crucible. I scrapped down the sides and tried to stir it all together. I let things heat back up and rechecked the melt again. This time the whole melt was no longer liquid, all foamy looking. The aluminum will not melt to a liquid form again. The aluminum looks just like solder when you get it too hot or try to resolder without using any flux.
Did I get the melt too hot?
Things to mention.
1.) I used a new larger crucible today.
2.) The aluminum was aluminum I broke down/melted in a fire before. I melted the aluminum in the fire to get it into smaller pieces to fit into the crucible.
Can you remelt aluminum over and over or do you need to add flux or some other additive? Sorry here, I'm very new to this.