废盐酸电解回用技术研究

Study on reuse of waste hydrochloric acid by electrolysis

采用隔膜电解法对低浓度盐酸废水进行电解回用实验研究,分别讨论了电流密度、电解液流量、电解液浓度、温度以及电解时间对槽电压和电流效率的影响,并得出槽电压最敏感因素为电流密度,电流效率最敏感因素为电解液流量。最佳工艺水平为:流量8 mL/min,电流密度0.2 A/cm2,电解液为质量分数7%的HCl与NaCl的混合液,电解温度70℃;并分析了槽电压与电流密度的关系以及电解流出液中游离氯的含量与电流密度和电解液浓度之间的关系。为废盐酸资源化利用提供了一种新思路和新方法。

The reuse of waste hydrochloric acid with low concentration by diaphragm electrolysis is studied. The effects of current density, electrolyte flow rate, electrolyte concentration, temperature and electrolysis time on cell voltage and current efficiency are discussed respectively. The results show that the most sensitive factor on cell voltage is current density,while the most sensitive factor on current efficiency is electrolyte flow. The optimal process conditions are as follows：8 mL/min of the flow, 0.2 A/cm2 of current density, 7% HC1 and NaC1 mixed solution as electrolyte concentration,70℃ of electrolysis temperature. The relationship between cell voltage and current density and the relationship of free chlorine content with current density or electrolyte concentration are analyzed. The reuse method provides a new thought and method for resource utilization of waste hydrochloric acid.