Is there a way to melt down Aluminum, Copper, Gold, Iron, Nickel, Lead, Silver and Tin in just two Smeltery without the metals combining?
Lets see ... Aluminium and gold tin and copper gold and silver nickel and iron make alloys so aluminium silver tin nickel and iron copper gold lead in either one should work
What I usually do is Ferrous, Copper, Gold, platinum/shiny and ardite in one. Everything else goes in the other. If you have tinker's steelworks with the deep tanks, you can actually manage with just one for the most part, as long as you have ducting pulling out everything as soon as it melts. Very little overlap or weirdness.