碘酸钾的电合成研究

A Study of Electrochemical Method for Preparation of Potassium Iodate

以碘和氢氧化钾为原料,用Pb-PbO2作阳极材料,应用电化学方法制备碘酸钾,并跟氯酸钾氧化法对照。实验指出:电化学法优于氯酸钾氧化法,在无隔膜条件下,电解液的最佳配方为:碘200g/L,K2Cr2O72g/L,KOH85g/L。最佳电解条件为:阳极材料为Pb-PbO2,阴极为不锈钢电极,槽电压为3.5—3.7V,电流密度为25A/dm2,温度50—60℃,电解时间为6h,在该条件下,电解制造碘酸钾的产率为89.7%,电流效率为98%,产品纯度为99.2%。

This paper investigated the preparation of Potassium Iodate by Electrochemical method. The influence of electrode material, current density, electrolyte temperature, pH, on current efficiency and Potassium Iodate yield was studied. The optimum experimental conditions for the preparature of Potassium Iodate are as follows: Anode Pb-PbO2, Cathode Resistant Steel, Current density(A/dm2) 25, pH 8.5-9.5, Electrolyte temperature(℃) 50-60, Current efficiency 98%, Potassium Iodate yield 89.7%.