Biological treatment of wastewater produced during recycling of spent lithium primary battery / Kyoungkeun Yoo in Minerals engineering, Vol. 23 N° 3 (Fevrier 2010)  

Public ISBD [article]  inMinerals engineering > Vol. 23 N° 3 (Fevrier 2010) . - pp. 219–224 Titre : Biological treatment of wastewater produced during recycling of spent lithium primary battery Type de document : texte imprimé Auteurs : Kyoungkeun Yoo, Auteur ; Shun-Myung Shin, Auteur ; Dong-Hyo Yang, Auteur Année de publication : 2011 Article en page(s) : pp. 219–224 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Biological treatment Metal wastewater Acidithiobacillus ferrooxidans Battery recycling Résumé : Wastewater produced during recycling of spent lithium primary battery was biologically treated with Acidithiobacillus ferrooxidans to decrease the pH and metal concentration. Since the wastewater contains high concentrations of Cr, Ni, and Li, the effects of these metals on the bacterial activity in a 9 K medium were also investigated. Samples of the medium with different metal concentrations were treated, and the oxidation ratio of Fe2+ ions was measured to examine the activity of bacteria. In the treatment of simulated wastewater, the presence of Cr and Ni ions with concentrations of 8000 g m−3 and 13,000 g m−3, respectively, did not inhibit the bacterial activity, whereas the oxidation ratio of Fe2+ ions was observed to be low in the medium when Li ion was present with a concentration at 5000 g m−3. This observation suggested that at this concentration, Li ion suppressed the bacterial activity. In the case of treatment of real wastewater containing Cr, Ni, and Li, the oxidation ratio of Fe2+ to Fe3+ was observed to be low while the Fe concentration and pH decreased to 21,633 g m−3 and 1.8, respectively. Thus, the wastewater produced during the recycling of spent lithium primary batteries can be effectively treated biologically for re-circulating in the recycling process. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002891 [article] Biological treatment of wastewater produced during recycling of spent lithium primary battery [texte imprimé] / Kyoungkeun Yoo, Auteur ; Shun-Myung Shin, Auteur ; Dong-Hyo Yang, Auteur . - 2011 . - pp. 219–224. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 3 (Fevrier 2010) . - pp. 219–224 Mots-clés : Biological treatment Metal wastewater Acidithiobacillus ferrooxidans Battery recycling Résumé : Wastewater produced during recycling of spent lithium primary battery was biologically treated with Acidithiobacillus ferrooxidans to decrease the pH and metal concentration. Since the wastewater contains high concentrations of Cr, Ni, and Li, the effects of these metals on the bacterial activity in a 9 K medium were also investigated. Samples of the medium with different metal concentrations were treated, and the oxidation ratio of Fe2+ ions was measured to examine the activity of bacteria. In the treatment of simulated wastewater, the presence of Cr and Ni ions with concentrations of 8000 g m−3 and 13,000 g m−3, respectively, did not inhibit the bacterial activity, whereas the oxidation ratio of Fe2+ ions was observed to be low in the medium when Li ion was present with a concentration at 5000 g m−3. This observation suggested that at this concentration, Li ion suppressed the bacterial activity. In the case of treatment of real wastewater containing Cr, Ni, and Li, the oxidation ratio of Fe2+ to Fe3+ was observed to be low while the Fe concentration and pH decreased to 21,633 g m−3 and 1.8, respectively. Thus, the wastewater produced during the recycling of spent lithium primary batteries can be effectively treated biologically for re-circulating in the recycling process. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002891

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Effect of chloride ions on leaching rate of chalcopyrite / Kyoungkeun Yoo in Minerals engineering, Vol. 23 N° 6 (Mai 2010)  

Public ISBD [article]  inMinerals engineering > Vol. 23 N° 6 (Mai 2010) . - pp. 471–477 Titre : Effect of chloride ions on leaching rate of chalcopyrite Type de document : texte imprimé Auteurs : Kyoungkeun Yoo, Auteur ; Soo-kyung Kim, Auteur ; Jae-chun Lee, Auteur Année de publication : 2011 Article en page(s) : pp. 471–477 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Chalcopyrite leaching Chloride solution Chlorocuprate(I) Cuprous ion Résumé : The effect of chloride on chalcopyrite leaching has been investigated by performing batch leaching tests with three kinds of leaching solutions and using Hiroyoshi’s model, which suggests that a zone of rapid leaching exists between the critical potential (Ec, equilibrium redox potential for the reduction of CuFeS2 to Cu2S) and the oxidation potential (Eox, equilibrium redox potential for the oxidation of Cu2S). The results of the leaching tests show that the leaching rate in hydrochloric acid solution is the fastest and that the relationship between the Cu leaching rate and oxidation–reduction potential (ORP) follows Hiroyoshi’s model. Thermodynamic calculations indicate that, with an increase in the chloride concentration, the concentration of cuprous ions increases as the chlorocuprate(I) complex ions are formed and the contribution of cuprous ions to the critical potential is greater than that of cupric ions, even though the concentration of cuprous ions is lower than that of cupric ions. This fact suggests that the formation of chlorocuprate(I) ions in a chloride solution may improve the chalcopyrite leaching rate by increasing the critical potential. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002854 [article] Effect of chloride ions on leaching rate of chalcopyrite [texte imprimé] / Kyoungkeun Yoo, Auteur ; Soo-kyung Kim, Auteur ; Jae-chun Lee, Auteur . - 2011 . - pp. 471–477. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 6 (Mai 2010) . - pp. 471–477 Mots-clés : Chalcopyrite leaching Chloride solution Chlorocuprate(I) Cuprous ion Résumé : The effect of chloride on chalcopyrite leaching has been investigated by performing batch leaching tests with three kinds of leaching solutions and using Hiroyoshi’s model, which suggests that a zone of rapid leaching exists between the critical potential (Ec, equilibrium redox potential for the reduction of CuFeS2 to Cu2S) and the oxidation potential (Eox, equilibrium redox potential for the oxidation of Cu2S). The results of the leaching tests show that the leaching rate in hydrochloric acid solution is the fastest and that the relationship between the Cu leaching rate and oxidation–reduction potential (ORP) follows Hiroyoshi’s model. Thermodynamic calculations indicate that, with an increase in the chloride concentration, the concentration of cuprous ions increases as the chlorocuprate(I) complex ions are formed and the contribution of cuprous ions to the critical potential is greater than that of cupric ions, even though the concentration of cuprous ions is lower than that of cupric ions. This fact suggests that the formation of chlorocuprate(I) ions in a chloride solution may improve the chalcopyrite leaching rate by increasing the critical potential. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S0892687509002854

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