[roilaa]

I have a solution containing approximately 200 g/L NaCl and 100 g/L KCl. I am trying to separate into the individual salts but without a huge energy input if possible. By chilling the solution the KCl should crystallise first, which should make it filterable but is there any easier way to do this?
Any help greatly appreciated.

[Meter]

Probably not. The difference in solubility properties is really the best way to tackle this problem without involving any exotic chemistry.