Refining solder

Good day to you We are radiator manufacturers.We are using tons of solder, 70/30 lead-tin.In the process of manufacturing the solder gets contaminated with copper 0.4% and is therefore not usable anymore,and has to be sold as scrap. Is there a process available to get the copper out. We have heard of the electrolysis process but we do not know how, can you help us please.

Have you tried the old PCB trick, cooling down the solder, I think temperature is 175 °C and remove the sludge ? PCB use solder of 65-35 Sn-Pb so I'm not sure the trick work for you.

Best regards,

sir please I am praduman s jain from India; I know some ideas for refining solder. please melt the scrap and add sulfur to it. please don't allow sulfur to burn, dissolve some powdered sulfur in molten solder all the copper will be skimmed out. rotate solder with a stick for at least 10 minutes all the dust will come out. and the last thing, please do this in open air and allow the air in chimney at some height.