title: Metal separation from mixed types of batteries using selective precipitation and liquid-liquid extraction techniques.
abstract: The purpose of this paper is to study metal separation from a sample composed of a mixture of the main types of spent household batteries, using a hydrometallurgical route, comparing selective precipitation and liquid-liquid extraction separation techniques. The preparation of the solution consisted of: grinding the waste of mixed batteries, reduction and volatile metals elimination using electric furnace and acid leaching. From this solution two different routes were studied: selective precipitation with sodium hydroxide and liquid-liquid extraction using Cyanex 272 [bis(2,4,4-trimethylpentyl) phosphoric acid] as extracting agent. The best results were obtained from liquid-liquid extraction in which Zn had a 99% extraction rate at pH 2.5. More than 95% Fe was extracted at pH 7.0, the same pH at which more than 90% Ce was extracted. About 88% Mn, Cr and Co was extracted at this pH. At pH 3.0, more than 85% Ni was extracted, and at pH 3.5 more than 80% of Cd and La was extracted.
authors.affiliation: Polytechnic School, University of Sao Paulo, Department of Metallurgical and Materials Engineering, Av.Prof. Mello Moraes 2463, Sao Paulo, SP 05508-900, Brazil. kprovazi@gmail.com
authors.forename: Kellie
authors.initials: K
authors.lastname: Provazi
authors.forename: Beatriz Amaral
authors.initials: BA
authors.lastname: Campos
authors.forename: Denise Crocce Romano
authors.initials: DC
authors.lastname: Espinosa
authors.forename: Jorge Alberto Soares
authors.initials: JA
authors.lastname: Tenório
mesh_terms: D011232:Chemical Precipitation; D003035:Cobalt / Q000737:chemistry / Q000302:isolation & purification; D011211:Electric Power Supplies; D059029:Electronic Waste; D008094:Lithium / Q000737:chemistry; D008670:Metals / Q000737:chemistry / Q000302:isolation & purification*; D010721:Phosphinic Acids / Q000737:chemistry; D012037:Refuse Disposal / Q000379:methods*; D012972:Sodium Hydroxide / Q000737:chemistry
chemical_list: C523127:Cyanex 272; D008670:Metals; D010721:Phosphinic Acids; D003035:Cobalt; D012972:Sodium Hydroxide; D008094:Lithium