钢厂冷轧硫酸酸洗废水中试实验研究

Pilot Experimental Study on Sulfuric Acid Pickling Wastewater from Cold Rolling in Steel Mills

针对某冷轧厂产生的硫酸酸洗废水,分别采用单一离子交换工艺、单一纳滤工艺和离子交换-纳滤组合工艺将酸洗水处理为脱盐水回用。以电导率为检测指标,探究三种工艺铁离子和硫酸根离子的去除效果。试验结果表明:投加氢氧化钡可以同时达到去除铁离子和硫酸根离子的目的,离子交换+纳滤组合工艺为最优工艺,离子交换前置纳滤工艺可以有效提高离子交换运行周期,最终产水电导率为3μS/cm,符合脱盐水回用标准。

In response to the sulfuric acid pickling wastewater generated by a cold rolling mill,single ion exchange process,single nanofiltration process,and ion exchange nanofiltration combined process were used to treat the pickling water into desalinated water for reuse.Using conductivity as the detection index,this paper explores the removal efficiency of iron ions and sulfate ions in three processes.The experimental results show that the addition of barium hydroxide can simultaneously achieve the removal of iron ions and sulfate ions.The combination of ion exchange and nanofiltration process is the optimal process,and the pre nanofiltration process of ion exchange can effectively improve the operation cycle of ion exchange.The final water conductivity is 3μS/cm,which meets the standard for desalination water reuse.