I was referring to what they actually said. Like cesario eluded to: you don't need to melt ANYTHING to be paid for scrap. And you don't purify anything by simply melting it.
If you add sugar and water and a tea bag, you would get Sweet Tea... a combination of the 3 things. If you add silver, copper, zinc, nickel, lead, etc together, then guess what... you don't get Sweet Tea, you get an alloy of all those metals as they become elementally bonded together when they are all in the crucible together. They do not separate in a way that you can reclaim any material in pure form. In order to break that alloy bond, you need to process it by chemically reducing (stripping) these elements into individual ions and then reorganizing them so that all the silver is with silver, and the copper with copper, and so on. Or, you can just put all the silver together and forget the rest
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