硫酸铵转化法制取硫酸钾新工艺设计研究

Design research of a new process for production of potassium sulfate by ammonium sulfate conversion method

介绍了硫酸铵转化法制取硫酸钾新工艺设计及实验研究。依据体系的水盐相图,设计出的新工艺由硫酸钾的制备、中间热析硫酸钾铵的制备和氯化铵的制备3部分组成。根据新设计的工艺参数和操作指标,利用工业级原料进行了实验研究。实验数据与新设计工艺参数吻合较好。制备的硫酸钾含K2O质量分数51.63%,氧化钾利用率达92.16%。工艺过程中产生的固体热析硫酸铵钾以及精制硫酸钾母液、粗氯化铵母液、重结晶氯化铵母液等3种液体返回系统循环利用。整个工艺过程闭路循环,无污染排放。

The design and experimental study on a new process for the preparation of potassium sulfate via ammonium-potassium sulfate conversion method is introduced.According to the water-salt phase diagram of the system,the new process designed is composed of three parts: potassium sulfate preparation,thermal precipitation of ammoniumpotassium sulfate,and preparation of ammonium chloride. The experimental study is conducted through using industrial grade raw materials based on newly-designed process parameters and operation indexes. The obtained experimental data are in good agreement with the newly-designed process parameters.The prepared K2 SO4 contains 51. 63% of K2O and the utilization rate of K2O reaches 92. 16%.Ammonium-potassium sulfate,refined potassium sulfate mother liquor Ⅱ,crude ammonium chloride mother liquor Ⅳ,and recrystallized ammonium chloride mother liquor Ⅴ generated during the process are all recycled back to the system.The whole process is a closed loop and there is no pollutant to discharge.