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Solder

Donci6552
in Inorganic Chemistry

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Modern solder for both plumbing and electrical work is lead free by regulations.

 

Partial separation can be effected by physical means (heating) but the residue will approach the eutectic mixture ever more closely.

 

http://www.chemguide.co.uk/physical/phaseeqia/snpb.html

 

If you are able to heat to gaseous states and conduct fractional distillation this would work.

 

Otherwise you will need to find an acid that dissolves tin but not lead (why not the other way round?) and follow this up with some chemistry.

 

But all these are hazardous procedures, there is no easy way.

Edited by studiot

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