sc7b01992_si_001.pdf (105.4 kB)
Modeling of Potassium Sulfate Production from Potassium Chloride by Electrodialytic Ion Substitution
journal contribution
posted on 2017-09-05, 00:00 authored by Xiaoyao Wang, Xiaozhao Han, Xu Zhang, Qiuhua Li, Tongwen XuAn
experimental study was carried out on the preparation of potassium
sulfate from potassium chloride by electrodialytic ion substitution.
Effects of sulfate species, current density, and molar ratio of ammonium
sulfate to potassium chloride were investigated. Results showed that
ammonium sulfate was regarded as the optimum sulfate source because
of the lowest energy consumption and cheap raw materials. When current
density was set as 20 or 30 mA/cm2, the generated products
can conform to the Chinese Government standard (GB20406-2006). A higher
molar ratio can promote the substitution reaction more completely
but results in larger loss of K+ ions and more increment
of NH4+ ions in products. Moreover, a mathematical
model was established to predict the product concentration. Results
showed that there is a good agreement between experimental and computational
concentrations.