TL;DR: In this paper, a mixture of relatively coarse salt mixtures are treated in a manner such that certain of said salts are converted by recrystallization to very finely divided form and then separated from the coarse salts by size classification such as elutriation.
Abstract: Evaporite minerals comprising mixtures of relatively coarse salts are treated in a manner such that certain of said salts are converted by recrystallization to very finely divided form and then separated from the coarse salts by size classification such as elutriation, the treatment being especially useful in a process for the recovery of potassium sulfate from marine evaporite mixtures such as kainite and halite.