Recovery of metals from chloride leach solutions of waste of printed circuit boards by adsorption and precipitation

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dc.contributor.authorYazici, Ersin
dc.contributor.authorDeveci, Haci
dc.contributor.authorEhsani, Arman
dc.date.accessioned2025-01-06T17:29:46Z
dc.date.available2025-01-06T17:29:46Z
dc.date.issued2014
dc.descriptionAntofagasta Minerals; Edemet; et al.; Outotec; Russell; ThyssenKrupp Industrial Solutions
dc.description27th International Mineral Processing Congress, IMPC 2014 -- 20 October 2014 through 24 October 2014 -- Santiago -- 112722
dc.description.abstractThe downstream treatment of chloride leach solutions of WPCB for recovery of base and precious metals by a combination of adsorption and precipitation processes were carried out. A synthetic leach solution (1 M HCl, 116.5 g/L Cl-, 30 g/L Cu2+, 2.5 g/L Fe3+, 5 mg/L Au3+, 10 mg/L Ag+ and 20 mg/L Pd2+), which was prepared based on the composition of the pregnant leach solution obtained in the previous study was used in the tests. The leach solution was initially subjected to activated carbon (AC) adsorption #y(20 g/L AC, 80°C) in which gold was selectively recovered over silver and palladium i.e., 88% Au recovery at 0.5 h (92% at 3.5 h) compared with only 3-6% for Ag/Pd. Copper and iron were also observed to adsorb on AC as indicated by 1.4% and 17% decline, in their respective concentrations. Following the adsorption and filtration stage, metallic copper was added into the gold-barren solution to allow reduction of Cu2+ to Cu+, and to cement Pd on metallic copper. Over the mixing period (1 h), 93% of the Pd was recovered while only 1.4% of silver was cemented onto metallic copper. Subsequently, the leach solution was gradually neutralised by NaOH to pH 4, 7.5 and 9.5 for the precipitation of copper as cuprite (Cu2O). It was found that 41% and 46% of Cu and Ag, respectively, were precipitated at pH 4 at which iron was almost totally (99.8%) removed from solution. Precipitation of copper and silver was increased further at high pHs. At pH 9.5, cumulative recoveries for copper and silver were 91% and 85%, respectively. XRD analysis of the precipitates confirmed the presence of cupric copper oxides/hydroxides and revealed that copper losses occurred at pH 4 was due to the undesired presence of cupric copper in the solution.
dc.identifier.scopus2-s2.0-84938824696
dc.identifier.urihttps://hdl.handle.net/20.500.14669/1342
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherGecamin
dc.relation.ispartofIMPC 2014 - 27th International Mineral Processing Congress
dc.relation.publicationcategoryKonferans Öğesi - Uluslararası - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_20241211
dc.subjectActivated carbon
dc.subjectAdsorption
dc.subjectCarbon
dc.subjectCopper
dc.subjectCopper metallurgy
dc.subjectGold
dc.subjectLeaching
dc.subjectMetal recovery
dc.subjectMetals
dc.subjectPrinted circuit boards
dc.subjectPrinted circuits
dc.subjectRecovery
dc.subjectSilver
dc.subjectChloride leach
dc.subjectCopper loss
dc.subjectCumulative recovery
dc.subjectLeach solutions
dc.subjectMetallic copper
dc.subjectPrecipitation process
dc.subjectPregnant leach solutions
dc.subjectXRD analysis
dc.subjectCopper oxides
dc.titleRecovery of metals from chloride leach solutions of waste of printed circuit boards by adsorption and precipitation
dc.typeConference Object

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