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Recovery of cadmium and nickel from scrap batteries.

Authors
Wilson-DA; Wiegard-BJ Jr.
Source
NTIS: PB 204 136 :1-15
Link
NIOSHTIC No.
10008800
Abstract
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.
Publication Date
19710101
Document Type
IH; Report of Investigation;
Fiscal Year
1971
NTIS Accession No.
PB-204136
NTIS Price
A03
Identifying No.
RI 7566
NIOSH Division
CPRC;
Source Name
NTIS: PB 204 136
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