flunk,
You cannot melt out just the base metal like copper, or the silver, and leave pure gold.
Although the metals by themselves will have different melting points, when these metals are combined in a melt together they become an alloy, this alloy has a melting point different than the individual melting point of each of the individual metals that forms this alloy.
You can add a very oxidizing flux to the melt, and this would oxidize (some) of the base metals and these oxides of metal would report to the slag (glass), but you would not increase the purity of the gold more than just a tiny tiny bit, as most of the base metals and silver would still be there as molten metals not oxidized, I would doubt you could bring up the purity of your gold from 9K to 10K, and the gold would still need to be refined, so in doing this you spent a lot of money on the equipment to melt the gold in, the chemicals needed to make the flux, the fuel to melt the gold, the time learning the principles, the time of trying this failed experiment, and possibly ruin the marking stamped on your gold making it harder to sell for the value it is worth.
Basically just forget the idea it will not work.
If you do not want to use chemicals, and want pure gold, buy karat gold from public at a reasonable price, take the karat gold and sell this gold in volume to a refiner when price of gold is high, buy refined 24K gold when price of gold is low, you would probably make more money doing that than refining, if you wish to do this then study testing of gold (pawn brokers guide to testing gold), and (Hokes testing of precious metals), learn to calculate the karat value of gold you tested for, and learning how to sell your gold without getting taken to the bank (sampling assays, and so on). Everything you need is here on the forum.
I know you like your online name, I guess I am just old fashioned, I do not like it, it seems disrespectful to me, and I wonder why you would wish for others to see you that way, you seem like a respectable person.
