普钙厂联产磷酸二氢钾工艺研究

Process for the Production of Potassium Dihydrogen Phosphate from Ordinary Superphosphate

研究了以普钙和硫酸钾为原料制备磷酸二氢钾的工艺条件。普钙厂联产磷酸二氢钾的最佳工艺条件为：普钙与水投料比为1：2．5—3，反应温度为20℃-60℃，反应时间为120min，除杂pH值控制在5.5-6。

Potassium dihydregen phosphate was prepared by the reaction of ordinary superphosphate with potassium sulfate, and effecting factors were investigated. Experimental result indicated that the optimal condition was ratio of ordinary superphosphate to water as 1：2.5 -3, reaction at 20℃ -60℃ for 120 min and purification at pH 5.5 -6.