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Water soluble potassium sulfate dissolves rapidly and completely in water. Its main characteristics are purity and dissolution rate. In this study, the purification and rapid dissolution of potassium salt (K 2 SO 4 ) separated from potassium brine deposits collected from Lop Nur basin of China (referred to as LN K 2 SO 4 ) were studied for utilization in agricultural farming as a potash fertilizer. First, the dissolving-crystallizing process was conducted to remove the insoluble content and improve the purity of K 2 SO 4 . Second, physical modification of K 2 SO 4 surfaces was accomplished based on the Noyes-Whitney equation. The results showed that the water insoluble content could be completely removed and the purity of K 2 SO 4 reached 100% in the purification process. The dissolution rate was significantly improved with the help of environmentally-friendly additives such as sodium tripolyphosphate (STPP)/urea phosphate (UP). These additives ameliorated the diffusion coefficient ( D ) and the diffusion layer thickness ( h ) for K 2 SO 4 . Results also demonstrated that a larger K 2 SO 4 surface area ( S ) induced a higher dissolution rate.

Purification and rapid dissolution of potassium sulfate in aqueous solutions