化学镀镍老化液中镍、磷的处理与回收

以 Ca(OH) 2 作为沉淀剂 ,调节溶液 p H =1 2 ,在 80℃条件下反应 1 h,使化学镀镍老化液中镍浓度降到1 / mg· L- 1 ;分离沉淀后的溶液用硫酸调节 p H=8,按 Ca(Cl O) 2 与总 P重量比为 3 .5∶ 1 .0的比例加入 Ca(Cl O) 2 ,老化液中的磷酸盐通过形成沉淀得到去除 ,从而使化学镀镍老化液中的镍、磷含量均达到国家排放标准。对于含 Ni(OH) 2 的沉淀 ,以稀硫酸溶解回收其中的镍 ,剩余沉渣建议填埋处理 ;磷酸盐沉淀可以作为磷肥资源回用于农业生产。

Treatment and Recovery Nickel and Phosphorus from Chemical Nickel Plating

The concentration of Ni in chemical Nickel Plating was decreased to 1mg/L by Ca(OH)2 with pH＝12,t＝80℃ and one hours. The solution and the sediment were separated by filtration. The solution was adjusted to pH＝8 by H2SO4 and added Ca(ClO)2 into it with the weight rate3. 5 : 1.0 for Ca(ClO)2 and total P at 50℃. The final effluent contained 1mg/L total P and less than 1mg/L Ni and could be emit directly. The Nickel in Ni(OH)2 sedimentation was recovered by diluted H2SO4. The phosphate sedimentation could be used as the fertilizer.