Recovery of Nickel Metal from Spent Nickel Plating Watts Bath

• Main Authors: Yun-Di Chen, 陳昀杕
• Other Authors: Kuo-Ching Chang
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/93663942154247262091

碩士 === 國立屏東科技大學 === 環境工程與科學系所 === 95 === The objective of this study is to reclaim nickel from the spent nickel plating liquids via sulfuric acid addition technique and crystallization recycling technology. Adding sulfuric acid into waste liquid can reduce the concentration of Cl-, B3+, and COD. The nickel sand can then be added into the treated waste liquid to pursue the feasibility of reclamation. The crystallization recycling technology includes the sulfuric acid saturation method and alcohol separation method. The results from sulfuric acid addition experiments showed that the precipitation contain a few green crystal and destruction efficiencies for Cl-, B3+, and COD were 35.29%, 49.26%, and 46.3% respectively when 15 mL sulfuric acid were added into. The composition of nickel in green crystal was 22.28% which can be compared with electroplating graded Nickel Sulfate Hexahydrate. Nickel sand from wastewater treatment plant could increase the content of nickel ion in waste liquid and hence enhance the precipitation. The results from sulfuric acid saturation experiments showed that the composition of nickel in the precipitation was 21.04～21.97%. The best recovery efficiency for nickel was 80.09%. On the other hand, the results from alcohol separation experiments showed that the composition of nickel in the precipitation was 20.9～22.13%. The best recovery efficiency for nickel was raised to 85.16%.