Environ Technol. 2014 May-Jun;35(9-12):1263-8. doi: 10.1080/09593330.2013.865791.
The removal of nickel (Ni) and cadmium (Cd) from spent batteries was studied by the chemical method. A novel leaching system using ferric sulphate hydrate was introduced to dissolve heavy metals in batteries. Ni-Cd batteries are classified as hazardous waste because Ni and Cd are suspected carcinogens. More efficient technologies are required to recover metals from spent batteries to minimize capital outlay, environmental impact and to respond to increased demand. The results obtained demonstrate that optimal conditions, including pH, concentration of ferric sulphate, shaking speed and temperature for the metal removal, were 2.5, 60 g/L, 150 rpm and 30 degrees C, respectively. More than 88 (+/- 0.9) and 84 (+/- 2.8)% of nickel and cadmium were recovered, respectively. These results suggest that ferric ion oxidized Ni and Cd present in battery waste. This novel process provides a possibility for recycling waste Ni-Cd batteries in a large industrial scale.
采用化学法研究了从废旧电池中去除镍（Ni）和镉（Cd）。引入了一种使用硫酸铁水合物的新型浸出系统来溶解电池中的重金属。镍镉电池被归类为危险废物，因为 Ni 和 Cd 被怀疑是致癌物质。需要更有效的技术从废旧电池中回收金属，以最大限度地减少资本支出、环境影响，并满足日益增长的需求。获得的结果表明，去除金属的最佳条件，包括 pH 值、硫酸铁浓度、搅拌速度和温度，分别为 2.5、60 g/L、150 rpm 和 30 摄氏度。分别回收了超过 88（+/-0.9）和 84（+/-2.8）%的镍和镉。这些结果表明，铁离子氧化了电池废物中存在的 Ni 和 Cd。这种新型工艺为大规模工业回收废镍镉电池提供了可能。
