抄録
The NS salt B prepared from bittern can be used without any treatment as a new basic potassium magnesium fertilizer. It may, also, be used to prepare potassium sulfate by hydrolysis. So, the following procedures to separate potassium sulfate were investigated:(1) hydrolysis of NS salt B into the solid magnesium hydroxide and the solution containing one part of potassium sulfate and two parts of magnesium sulfate,(2) addition of gypsum to the hydrolized solution to separate syngenite,(3) hydrolysis of syngenite, into the solid gypsum and the solution containing potassium sulfate and small amount of calcium sulfate,(4) crystallization of potassium sulfate by evaporating the solution obtained in the third step,(5) utilization of the separated mother liquor of syngenite in the second step.
