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Recovery of cadmium and nickel from scrap batteries.
Wilson-DA; Wiegard-BJ Jr.
NTIS: PB 204 136 :1-15
A cyclic leaching process was developed for selectively leaching and recovering cadmium from nickel-cadmium scrap battery waste. The six major steps in the process are the following: (1) washing the plates to remove koh electrolyte, (2) roasting at 550 deg to 600 deg c to oxidize metallic cadmium and decompose cadmium and nickel salts, (3) leaching with an ammonium nitrate solution, (4) precipitation of the leached cadmium from solution as cadmium carbonate using co2 gas, (5) removel of co2 from the lixiviator by adjusting to ph 4.5, Heating, and evacuating the system, and (6) removal of small amounts of leached nickel from the lixiviator using a solvent extraction technique. The regenerated lixiviator is then recycled to leach additional plates. Cadmium extraction was 94 percent and the cadmium carbonate product contained 0.14 percent nickel and 0.12 percent cobalt impurity. The leached plates were smelted to a high nickel-low iron alloy with no detectable amounts of cadmium.
IH; Report of Investigation;
NTIS Accession No.
NTIS: PB 204 136
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division