Welcome to us.hallo every one ,
i am new in forum .
work like goldsmith in london .
have interesed to hot separating and refining metals .
Cupelation are mostly for reclaiming PMs from ore or very mixed dirty unknown mixes.example - cupelation .
As you say separating the metals can not be done by heat.yes , 4 metals you want to bring useful information . if you want to much you can say easy for not english person like me .
have nuance goldsmith work with pm aloys 9 ct ,18ct , 950 , 925 .
pure pm is just in the begining ,every day i work with aloys.
they can be useful with proper fisical parameter - can be bended , soldered , welded and can be recycled.
pb 0.0001 part of aloy make - "broken "metal must be refined to 14 ct, or 18 ct useful aloy .( not 100% pure metal) clear and pure are different for goldsmith and rafiner .
in this case i use oxidasing or neutralising or degasing melting with chemical like borax , or metal like cadmium ,or with soda .
separate case - i have mix with dust pt, ag,au. they wait to find method for separating .this is not casual tusk .
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