锂、钠、钾盐溶液体系中磷石膏转化制备α-CaSO4·0.5H2O形成复盐的研究

Study of the Preparation ofα-CaSO4·0.5H2O into Compound Salts from Phosphogypsum in Lithium,Sodium or Potassium Salt Solutions

选用氯化锂、氯化钠、氯化钾三种盐溶液,以磷石膏为原料,研究常压盐溶液法制备α-CaSO4·0.5H2O时复盐形成的情况。结果发现,只有氯化钾溶液中磷石膏转化形成复盐。以氯化钾为重点,研究了磷石膏转化为K元素和CaSO4复盐的晶型、形貌和转化速率的变化情况。

In the paper,lithium chloride,sodium chloride and potassium chloride salt solutions were selected to study the compound salt formation whenα-CaSO4·0.5H2O was prepared by atmospheric salt solution with phosphogypsum as raw ma⁃terial.It was found that only phosphogypsum in potassium chloride solution was converted to compound salt.The crystal shape,morphology and conversion rate of phosphogypsum into potassium-CaSO4 compound salt were studied with the em⁃phasis of potassium chloride.