关键词: 磷石膏, 硫酸钾, 一步法, 氯化钾

Abstract: The technology that producing potassium with phosphogypsum and potassium chloride by adding proper solvent was studied.Main variables affecting the yield of potassium sulfate in ammonium or ethyl alcohol-ammonium solution were researched.The optimized reaction conditions were obtained as follows：mass fraction of ethyl alcohol was 25%，initial mass fraction of ammonia was 25%，reaction temperature was 5 ℃，reaction time was 60 min，and ratio of liquid volume  to solid mass was 10∶1 mL/g. Under those optimum conditions the yield of potassiumoxide was about 70%.The quality of the obtained potassiumsulfateproduct also reached the standard of agricultural first-grade products.The producing process was simpler and the operational conditions were milder than others. Additionally，the solvent can be recycled and reused，which was better for increasing the economic benefit.

Key words: phosphogypsum, potassium sulfate；one-stage process；potassium chloride