Abstract An effective method for extracting trace iodine from wet-process phosphoric acid (WPA) was designed. The iodine content in WPA was determined using an iodide-selective electrode. In addition, in this method, the sample solution, which contained approximately 2 ppm iodide, was phosphoric acid (PA) from WPA. The optimal extraction conditions were as follows: the PA/H2O2 volume ratio was 1:24, the PA/simethicone volume ratio was 1:3, the reaction time was 1 h, the reaction temperature was 45 °C, and no stirring was needed. The extraction yield of iodine reached 95%. A kinetic model was established based on bubbles with different rising velocities, and the characteristic viscosities of the gases as well as the heat flow rates of the bubbles were determined to simulate bubble movement. Then, the extraction principle was discussed, and the effect of bubble movement on extractability was analysed. The extractant (simethicone) can be recycled. Therefore, the proposed method can be considered a rapid, simple, and environmentally friendly method of extracting trace iodine from WPA.

中文翻译：

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一种去除湿法磷酸中微量碘的方法

摘要 设计了一种从湿法磷酸(WPA)中提取微量碘的有效方法。使用碘化物选择性电极测定 WPA 中的碘含量。此外，在该方法中，含有约 2 ppm 碘化物的样品溶液是来自 WPA 的磷酸 (PA)。最佳提取条件为：PA/H2O2体积比1:24，PA/二甲基硅油体积比1:3，反应时间1h，反应温度45℃，无需搅拌. 碘的提取率达到95%。基于不同上升速度的气泡建立动力学模型，确定气体的特征粘度和气泡的热流率，模拟气泡运动。然后，讨论了提取原理，并分析了气泡运动对可萃取性的影响。萃取剂（二甲基硅油）可以循环使用。因此，所提出的方法可以被认为是一种快速、简单、环保的从 WPA 中提取痕量碘的方法。