Leaching of metastannic acid from e-waste by-products

Djokić, Jovana; Jovančićević, Branimir; Brčeski, Ilija; Ranitović, Milisav; Gajić, Nataša; Kamberović, Željko

doi:10.1007/s10163-020-01076-5

Cited by 5 publications

(2 citation statements)

References 23 publications

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“…Depolymerisation, smelting, ER, and tin precipitate extraction processes are described by Djokić et al [15].…”

Section: Sole E-waste Preparation Processmentioning

confidence: 99%

“…If feed material is sole e-waste, a non-standard tin precipitate is also generated during electrorafination (ER) due to a high Sn concentration in the starting material. This non-standard by-product requires additional treatment steps [15]. Due to upstream recycling chemistry and complex electrolyte composition, the subsequent electrowinning (EW) step is also challenging.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Electrolyte Impurities from E-Waste Electrorefining on Copper Extraction Recovery

Djokić

Radovanović

Nikolovski³

et al. 2021

Metals

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In order to reflect possible issues in future sole e-waste processing, an electrolyte of complex chemical composition reflecting system of sole e-waste processing was obtained by following a specially designed pyro-electrometallurgical method. The obtained non-standard electrolyte was further used for the purpose of comprehensive metal interference evaluation on the copper solvent extraction (SX) process. Optimization of the process included a variation of several process parameters, allowing determination of the effect of the most abundant and potentially the most influential impurities (Ni, Sn, Fe, and Zn) and 14 other trace elements. Moreover, comparing three commercial extractants of different active chelating groups, it was determined that branched aldoxime reagent is favorable for Cu extraction from the chemically complex system, as can be expected in future e-waste recycling. The results of this study showed that, under optimal conditions of 20 vol.% extractant concentration, feed pH 1.5, O/A ratio 3, and 10-min phase contact time, 88.1% of one stage Cu extraction was achieved. Co-extraction of the Fe, Zn, Ni, and Sn was under 8%, while Pb and trace elements were negligible. Optimal conditions (H2SO4 180 g/L, O/A = 2, and contact time 5 min) enabled 95.3% Cu stripping and under 6% of the most influential impurities. In addition, an impurity monitoring and distribution methodology enabled a better understanding and design of the process for the more efficient valorization of metals from e-waste.

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“…Depolymerisation, smelting, ER, and tin precipitate extraction processes are described by Djokić et al [15].…”

Section: Sole E-waste Preparation Processmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%