| Abstract |
Chemical plating of nickel is widely used in wafer packaging. However, frequent renewal of plating baths generates a large amount of waste solution. When hazardous Ni2+ ions are removed from waste solutions through chemical precipitation, the complexing agent in the solution hinders nickel removal and reduces the nickel hydroxide [Ni(OH)(2)] precipitate size to approximately 0.5 mu m. This study revealed that the precipitation rate of Ni(OH)(2) can be controlled by the pH, temperature, and agitation. Furthermore, a Ni removal efficiency of more than 98% can be achieved. X-ray diffraction analysis revealed that the recovered particles included amorphous Ni(OH)(2) and alpha-Ni(OH)(2), indicating a high potential for energy conversion in nickel-based secondary batteries. Therefore, the proposed method can be used to sustain a circular economy by creating a Ni waste-toenergy cycle. |
