硫酸钾的转化法制备及其晶体生长过程原位观察

Preparation of K₂SO₄ using convention method and in-situ observation of its crystal growth

摘要: 为了提高硫酸钾产品纯度和回收率,研究硫酸铵加入比以及氯化钠杂质对硫酸钾产品的纯度和回收率的影响,并用蔡司体式显微镜原位在线观察硫酸钾晶体的生长过程,以找到有利于硫酸钾晶体快速生长的条件.结果表明:氯化钾与硫酸铵化学计量比2KCl∶(NH₄)₂SO₄为1∶1时,硫酸钾产品回收率达到80%左右;氯化钠杂质严重影响硫酸钾产品的纯度和回收率,降低产品质量;提高溶液中硫酸钾的过饱和度和溶液流速可以加快硫酸钾晶体的结晶生长.

Abstract: The effects of the reaction molar ratio of ammonium sulfate and the content of sodium chloride on the purity and yield of potassium sulfate were investigated in this article. The growth rate of single crystal potassium sulfate was in-situ observed with a stereo microscope in a flow system to find desirable conditions for the rapid growth of potassium sulfate crystals. The results indicate that the recovery of potassium sulfate is about 80% when the molar ratio of 2KCl to (NH₄)₂SO₄ is 1:1. Na Cl has significant influence on the purity and recovery of potassium sulfate,and reduces the quality of the product. To accelerate the growth of potassium sulfate crystals,the saturation of potassium sulfate and the solution flow rate should be increased.