The effects of temperature and agitation speed on the leaching behaviors of tin and bismuth from spent lead free solder in nitric acid leach solution
MetadataShow full item record
Nitric acid leaching was performed to separate tin and bismuth in spent Pb-free solder. The effects of agitation speed and leaching temperatures on the leaching behaviors of tin and bismuth were investigated to recover tin and bismuth from the spent solder, respectively. The leaching efficiency of bismuth increased rapidly with increasing agitation speeds and temperatures, and the efficiency is found to be 97.8% under the following leaching conditions: nitric acid concentration of 1 k mol m<sup>- 3</sup>, agitation speed of 400 rpm, 1% pulp density, leaching temperature of 90°C, leaching time of 1 hour. In the case of tin, the leaching efficiency increased and then decreased during leaching tests, and a white precipitate was observed in the reactor. XRD results indicate that tin precipitated as stannic acid (SnO<inf>2</inf> H<inf>2</inf>O). Consequently, bismuth and tin could be separated successfully by nitric acid leaching process.
Showing items related by title, author, creator and subject.
Kumar, M.; Lee, J.; Kim, M.; Jeong, J.; Yoo, Kyoungkeun (2014)This study aims to understand the acid-leaching behavior of metals from 2 to 4 mm waste printed circuit boards (WPCBs) containing 22.0% ± 1.1 Cu, 6.7% ± 0.2 Ca, 0.68% ± 0.02 Sn, 0.59 ± 0.01 % Pb, 2.71% ± 0.08 Al, 0.22% ± ...
Kim, S.; Lee, J.; Yoo, Kyoungkeun (2016)A hydrochloric acid (HCl) leaching process with stannic chloride (SnCl4) was proposed to leach Sn from waste Pb-free solder containing Sn, Ag, and Cu, where the oxidant stannic ion (Sn4 +) oxidizes Sn metal into stannous ...
Dismantling of electric and electronic components from waste printed circuit boards by hydrochloric acid leaching with stannic ionsJung, M.; Yoo, K.; Alorro, Richard (2017)© 2017 The Japan Institute of Metals and Materials. A dismantling process for separating electric and electronic components (EECs) from printed circuit board (PCB) was developed by using hydrochloric acid (HCl) leaching ...