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采用液相化学还原法从碱性蚀刻废液中制备高纯度的纳米铜粉,以回收碱性蚀刻废液中的铜。研究了还原剂种类和用量、反应温度和反应时间对纳米铜粉形貌、粒度和分散性的影响。结果表明,制备纳米铜粉的最佳还原剂为水合肼,最优工艺条件为:PVP(聚乙烯吡咯烷酮)0.003g/L,CTAB(十六烷基三甲基溴化铵)0.002g/L,n(N2H4.H2O):n{[Cu(NH3)4]2+}=1:3,反应温度70°C,反应时间30min。采用最优工艺可制得球状、粒径在100nm范围内、纯度高、抗氧化性好的纳米铜,对碱性蚀刻废液中铜的回收率在98%以上。
The liquid phase chemical reduction method is used to prepare the high-purity nano-copper powder from the alkaline etching waste liquid to recover the copper in the alkaline etching waste liquid. The effects of the type and amount of reductant, reaction temperature and reaction time on the morphology, particle size and dispersion of nano-copper powder were investigated. The results showed that the best reductant for the preparation of copper nanoparticles was hydrazine hydrate. The optimum conditions were as follows: 0.003g / L PVP (polyvinylpyrrolidone), 0.002g / L CTAB (cetyltrimethylammonium bromide) , n (N2H4.H2O): n {[Cu (NH3) 4] 2 +} = 1: 3, reaction temperature 70 ° C, reaction time 30min. The best process can be obtained spherical, particle size in the 100nm range, high purity, good oxidation resistance of nano-copper, alkaline etching of copper recovery rate of more than 98%.