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- W2554171036 abstract "Abstract The aim of this study was to examine the role of epoxy in the bioleaching of copper from electronic wastes. Metal dissolution tests were performed by chemical leaching using fungi generated citric acid mimicking the spent medium based leaching. Copper dissolution from electronic waste was found to be inhibited by the decomposition of its epoxy component during the leaching process. Citric acid attack and partial depolymerisation of epoxy resulted in amine group cleavage and release raising the solution pH from an initial of 1.8 up to 6.1 and with resulting epoxy surface modification promoted the removal of dissolved copper by adsorption and precipitation as di-copper citrate. Independent measurement of epoxy induced copper loss was used to reconcile the true copper recovery from citric acid at pH from 1.8-3.0, temperatures from 30-90°C, pulp densities of 5-100 g/L and 24 hours. Copper loss of up to 30% of the total copper in the waste or 83% of the dissolved metal was observed. Inhibition of copper dissolution with increasing waste pulp density was largely attributed to the epoxy induced copper removal. In addition these secondary reactions masked the self catalysis of copper dissolution by Cu" @default.
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- W2554171036 date "2014-01-01" @default.
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- W2554171036 title "ATINER's Conference Paper Series ENV2015-1447" @default.
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