Sunday 28 June 2020

thermodynamics - Can one get clear ice crystals from a dirty suspension?


Euteictic freeze crystallization is a method where an electrolytic solution is cooled and separated into a stream of (relativly) clean, pure ice and a salty brine. I know anectdotally of wine concentrates that where made similiar. Now I wonder wether a suspension of solids can be separated in a similiar way, and if so under what circumstances, and if not, why.



Some half baked thoughts of mine:




  • Anecdotally, if I put soup into the the freezer, no easily visible separation occurs.




  • With comparativly large suspended particles, a growing ice crystal may not be able to 'push' particles away and encapsulate them instead.




  • With salty solutions, the brine is denser than the water or ice and separates by gravity - while in my soup, er suspension, some solids will settle at the top with the ice and become frozen in it.





  • The whole thing my simply be a matter of time, with slower freezing allowing for cleaner crystals






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