Separation of cadmium and nickel from waste Ni-Cd batteries

摘要

To separate the cadmium and nickel resources in waste Ni-Cd batteries, a self-designed vacuum distillation recycling system was studied under laboratory conditions. The effects of system temperature, operating pressure, and time on the separation of Ni and Cd were studied respectively. The mechanism of vacuum thermal recycling was also discussed. Results show that vacuum distillation is a very effective separation method for waste Ni-Cd batteries. At a constant pressure, the increase of temperature can improve the separating efficiency of Cd. When the temperature is 1 173 K, cadmium can evaporate completely from the samples during 3 h at 10 Pa. The reduction of pressure in a certain range is effective to the separating of Cd from Ni-Cd batteries by vacuum distillation.