基于超临界水技术处理含铜蚀刻废液制备纳米铜的技术经济性评估

TECHNOLOGY AND ECONOMY EVALUATION OF PREPARATION OF COPPER NANOPARTICLE FROM COPPER CONTAINING WASTE ETCHING SOLUTION BASED ON SUPERCRITICAL WATER TECHNOLOGY

通过对比分析多种含铜蚀刻废液处理方法的优缺点,提出了优化的"酸碱蚀刻废液自中和-酸溶解-还原超临界水热合成"组合工艺方案,将废液中铜离子制备为纳米铜粉。首先将酸性、碱性蚀刻废液按一定比例混合发生中和反应生成沉淀,再采用硫酸溶解沉淀生成硫酸铜溶液,最后采用该硫酸铜溶液进行还原超临界水热合成反应制备纳米铜终产物。该工艺方案具有流程简单、易大规模应用、可实现废液零排放和纳米铜粉制备效率高等技术优势;处理废液的运行费用约为3500元/t,制备的纳米铜粉可获得极高的经济收益,在蚀刻废液的无害化处理及资源化利用领域中具有广阔的发展前景。

Through comparative analysis of the characteristics of various treatment methods of waste etching solution, proposed an optimized combination process of ＂Self neutralization - Acid dissolution - Reductive hydrothermal synthesis＂ to prepare copper nanoparticle. The main technological process has the following steps： First acidic and alkaline waste etching solution mixed in certain proportion and generated precipitation, then the precipitation was dissolved by sulfuric acid to produce copper sulfate solution, and then using the copper sulfate solution copper nanoparticle was prepared by reductive supercritical hydrotherrnal synthesis reaction. Studies show that the process has the technical advantages of simpleness, easy industrialization, no waste discharge, and copper nanoparticle preparation with high efficiency etc. The operating cost of treating per ton waste solution by this process was estimated to be about 3 500 yuan/t. In addition, the produced copper nanoparticle can bring high economic benefits. Thus, this optimized combination process has wide development prospects in the field of harmless treatment and resource utilization of waste etching solution.