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• W2747187037 endingPage "1112" @default.
• W2747187037 startingPage "1102" @default.
• W2747187037 abstract "The present paper reports the application of ammonium persulfate ((NH4)2S2O8) assisted with oxygen and pressure to recover gold from electronic waste (e-waste). This process suggests the selective breaking of metallic bonds to release gold from its substrate without grinding stages or pollutants generation. Waste printed circuit boards were analyzed to determinate base metals (Ni, Fe, Cu) and gold (Au) using microwave plasma atomic emission spectroscopy. After chemical characterization, aqueous commercial grade ammonium persulfate was used to produce the persulfate anion (S2O82−) and the oxidative sulfate ion (SO42−), which partially oxidized and leached the base metals breaking the AuNiFeCu bonds and allowing gold to be recovered in its original non-leaching state. The influence of oxygen and pressure in the base metals oxidation and gold recovery were separately studied in two different oxidative systems and evaluated by analysis of variance. Firstly, the system S2O82−/O2 was studied under the addition of oxygen (0.1–1.0 L/min) with (NH4)2S2O8 concentration (0.66–1.31 M), and liquid/solid ratio (15–25 mL/g). Secondly, the system S2O82−/Pressure was evaluated increasing pressure (101–203 kPa) with (NH4)2S2O8 concentration (0.66–1.31 M), and liquid/solid ratio (15–25 mL/g). The recovery of gold was made using optimal conditions and reaction times of 30 min in the S2O82−/O2 system and 5 min in the S2O82−/Pressure system. At those reaction times, gold was recovered in its solid state and was analyzed using scanning electron microscopy. The findings presented in this paper suggest that the oxidative reaction produced by the system S2O82−/Pressure could be applied to release and recover gold from e-waste with an effective reduction of the agent consumption and minimum time." @default.
• W2747187037 created "2017-08-31" @default.
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• W2747187037 date "2017-11-01" @default.
• W2747187037 modified "2023-09-27" @default.
• W2747187037 title "Gold recovery from printed circuit boards by selective breaking of internal metallic bonds using activated persulfate solutions" @default.
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• W2747187037 doi "https://doi.org/10.1016/j.jclepro.2017.08.124" @default.
• W2747187037 hasPublicationYear "2017" @default.
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