铅锌冶炼废水中硫酸钠的循环利用技术研究

Study on the Recycling Method of Sodium Sulfate in Lead-Zinc Smelting Wastewater

针对铅锌冶炼废水中硫酸钠资源化利用的问题,利用带有隔膜的一膜两室自制电解槽进行电解制备酸(H 2SO 4)和碱(NaOH)的实验,探究硫酸钠浓度、电流密度、极板间距、电解时间等参数对酸、碱产率的影响,从而确定最优电解方案。实验结果表明,最佳实验条件为硫酸钠浓度为25%,电流密度85.0 mA/cm 2,外加循环电解液体积为70 mL,循环速率50 mL/min,极板距离5 mm,电解时间3 h。在上述最优条件下,酸、碱产率都能达到10%左右,在实现环保的同时,也可实现高盐废水的循环利用,提升铅锌冶炼清洁、可持续发展能力。

Aiming at the problem of resource utilization of sodium sulfate in lead-zinc smelting wastewater,the experiment of electrolytic preparation of acid(H 2SO 4)and alkali(NaOH)was carried out by using a self-made electrolytic cell with diaphragm and two chambers.The effects of sodium sulfate concentration,current density,plate spacing and electrolysis time on the yield of acid and alkali were investigated,so as to determine the optimal electrolysis scheme.The experimental results show that the optimum experimental conditions are as follows:sodium sulfate concentration is 25%,current density is 85.0 mA/cm 2,the volume of external circulating electrolyte is 70 mL,the circulation rate is 50 mL/min,the plate spacing is 5 mm,and the electrolysis time is 3 h.Under the above optimal conditions,the yields of acid and alkali can reach about 10%.While realizing environmental protection,it can also realize the recycling of high-salt wastewater and improve the clean and sustainable development ability of lead-zinc smelting.