磷石膏氨化制备硫酸铵溶液工艺研究

ZOU Xueyong,ZHU He,ZHENG Guangming,LI Fang,WANG Fengling,SUN Hualin,ZHAO Chunyang

Phosphate & Compound Fertilizer（2023）

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Abstract

以磷石膏为原料制备(NH4)2SO4溶液与CaCO3,可将磷石膏中的钙、硫资源循环利用.考察氨化反应的温度、时间、物料比、液固质量比对CaSO4转化率的影响,得到最佳工艺参数:反应温度40℃,反应时间1.5 h,m(磷石膏)∶m(碳酸氢铵)∶m(氨水)为1.00∶0.78∶1.33,液固质量比0.75,此时CaSO4转化率超过99％.同时进行(NH4)2SO4及CaCO3分离实验,基本实现(NH4)2SO4与CaCO3完全分离,得到w((NH4)2SO4)8.32％的溶液,为后续加工奠定基础.

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