Ni-Cd battery recycling technology using high-temperature vacuum distillation

作者：Zhu Jianxin; Nie Yongfeng^*; Li Jinhui

来源：Journal of Tsinghua University(Science and Technology), 2003, 43(6): 858-861.

• High temperature vacuum distillation

The wide use of municipal solid waste incinerators has increased concern over heavy metal pollution. Spent Ni-Cd batteries, the main source of the heavy metal cadmium, should be removed and handled properly before the municipal solid waste is put into the incinerator. An experimental recovery system was designed to develop a process for disassembling and recovering selected materials from Ni-Cd batteries using high temperature vacuum distillation of the Ni-Cd batteries because of the distinct difference between cadmium and other metals. The results showed that the heavy metal cadmium could be effectively separated by vacuum distillation to produce high purity cadmium (> 99%). Water, organic substances and cadmium became vapor at high temperature in the vacuum system. The cadmium boiling point of was about 750 K at a heating rate of 2.5 K/min at 67 mPa. The distillation temperature should be at the range of 773 K to 1173 K. At 10 Pa and a distillation temperature of 1173 K, the cadmium content in the residue was less than 0.2% after distillation for 3 h.

• 出版日期2003
• 单位清华大学