[hodg123]

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.

[jeffmoonchop]

I think cooling something is easy enough?

[hodg123]

Yes it is, but I'm trying to get maximum recovery of KCl with minimum energy input and chilling even to 0-5 degrees celsius will only give me so much KCl (maybe 3-8g/L looking at solubility curves).
Reducing the water volume by rotavap would then start the NaCl to crystallise so I would get a mix of crystals which is not very useful as I would have to recrystallise multiple times.