We can produce SOP(K2O 50% or K2O 52%). Potassium Sulphate[English Name] Potassium SulphateFormula of potassium sulfate K2SO4, theoretical potassium (K2O) 54%, generally 50%, also contains about 18% of sulfur, sulfur is essential crop nutrients. Preparation of potassium sulfate potassium ore available, or the conversion of potassium chloride, or salt brine and other resources. Alunite is commonly ...