A friend has a few ounces of gold dust for lettering that he wants to make into a gold ingot. Can he do that with an electric furnace or does he need to use a crucible and a flame?
I’d suggest sending it to a refiner, rather than trying to melt it himself. The problem with finely divided “dust” or leaf, is that there’s so much surface area that it won’t melt cleanly, and there tends to be a lot of waste if it’s heated in an uncontrolled environment. I’ve heard from people who have tried it, and they said their gold just disappeared.
You can melt scrap either way, but I worry that the dust could have something other than gold in it as a result of how it was produced. You should probably send it to a refiner and have it recycled…Rob