Abstract:Recebido em 2/5/07; aceito em 11/1/08; publicado na web em 13/8/08 PROCESSING OF SPENT BUTTON CELLS. This work presents hydrometallurgical routes for recovering valuable elements from spent button cells, based on leaching of internal components with sulfuric acid (Li/MnO 2 and Zn-air) or nitric acid (Ag-Zn), at 90 o C for 2h. Slow evaporation of the leachate crystallized MnSO 4 .H 2 O, whereas lithium was partially recovered as LiF. Mercury present in Zn-air and Ag-Zn samples was precipitated as HgS. Silver wa… Show more
“…Selective precipitation has been investigated in several studies to selectively separate metals present in discarded batteries (Dorella and Mansur, 2007;Silva and Afonso, 2008;Pietrelli et al, 2002). In the current work, the influence of oxidant hydrogen peroxide was investigated in selective precipitation.…”
Section: Selective Precipitationmentioning
confidence: 99%
“…More concentrated ions can drag and co-precipitate other metals in selective precipitation (Silva and Afonso, 2008;Farley et al, 1985). H 2 O 2 influence was studied comparing selective precipitation in an oxidized and non-oxidized sulphuric means.…”
Section: Selective Precipitationmentioning
confidence: 99%
“…As the change of reagent concentration modifies the chemical balance in a reaction, and consequently its speed, the concentration of metals in the solution influences the precipitation efficiency of these metals (Silva and Afonso, 2008). Fig.…”
“…Selective precipitation has been investigated in several studies to selectively separate metals present in discarded batteries (Dorella and Mansur, 2007;Silva and Afonso, 2008;Pietrelli et al, 2002). In the current work, the influence of oxidant hydrogen peroxide was investigated in selective precipitation.…”
Section: Selective Precipitationmentioning
confidence: 99%
“…More concentrated ions can drag and co-precipitate other metals in selective precipitation (Silva and Afonso, 2008;Farley et al, 1985). H 2 O 2 influence was studied comparing selective precipitation in an oxidized and non-oxidized sulphuric means.…”
Section: Selective Precipitationmentioning
confidence: 99%
“…As the change of reagent concentration modifies the chemical balance in a reaction, and consequently its speed, the concentration of metals in the solution influences the precipitation efficiency of these metals (Silva and Afonso, 2008). Fig.…”
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