MAP法和折点氯化法联合工艺处理印制线路板铜氨废水试验研究

在废印刷电路板回收利用时通常会产生大量含重金属离子的废水，一般含有Cu（NH₃）₄]2+、NH₄+和NH₃·H₂O，这些铜氨络离子稳定性高，处理难度极高。文中以废印刷电路板在回收利用有价金属时产生的铜氨废水为研究对象，通过MAP法和折点氯化法联合工艺对该废水进行处理，有效回收了氨氮和铜。该联合工艺不仅可以有效地节约经济成本，并且回收的铜和氨氮产物也能产生一定的经济效益。结果表明:MAP反应的较优条件为pH=9.5，废水中氨氮与投入磷盐和镁盐的摩尔比为4:1:1.1，对氨氮的去除率为23%，铜的去除率为2%，形成了磷酸氨镁沉淀。折点氯化法的较优pH为9.5，N/Cl的摩尔比为1:1.6，氨氮处理效果为98.8%，铜去除率99.8%。 

Experimental study on treatment of copper ammonia wastewater from printed circuit board by MAP method and folded chlorination process

When waste printed circuit boards are recycled, a large amount of wastewater containing heavy metal ions is usually generated, and generally contains Cu(NH₃)₄]2+, NH₄+, and NH₃·H₂O. These copper ammine complex ions have high stability and are extremely difficult to handle. In this paper, the copper ammonia wastewater generated during the recycling of waste printed circuit boards is taken as the research object. The effective treatment of the wastewater and the recovery of ammonia nitrogen and copper are realized by the combined process of MAP method and broken point chlorination method, which can effectively save economic cost. And the recovery of products can also produce certain economic benefits. The results showed that the optimum conditions for MAP reaction were pH=9.5, the molar ratio of ammonia nitrogen to input phosphorus salt and magnesium salt in wastewater was 4:1:1.1, the removal rate of ammonia nitrogen was 23%, and the removal rate of copper was 2%. Formed a magnesium phosphate precipitate. The optimum pH of the chlorination method was 9.5, the molar ratio of N/Cl was 1:1.6, the ammonia nitrogen treatment effect was 98.8%, and the copper removal rate was 99.8%.