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- W2890764051 abstract "Hydrometallurgical removal of heavy metals (like chromium, iron, and zinc) from an industrial effluent, and their valorization into less-toxic species has been studied. At first, the solvent extraction of Cr(VI) was investigated with tri-butyl phosphate (TBP) to separate this carcinogenic metal from an electroplating effluent containing 3.43 g·L−1 Cr, 1.3 g·L−1 Zn, 0.41 g·L−1 Fe, and 1.23 mol·L−1 free acid of chloride medium. The study based on parametric variation revealed the spontaneity in adduct formation (HCrO3Cl·2TBP) into organic phase through the exothermic extraction process (ΔH°, −18.8 kJ·mol−1). The extracted species of Cr(VI) was efficiently stripped (∼99%) as less-toxin Cr(III) by 30 min of contact with 2.0 mol·L−1 ascorbic acid solution. Thereafter, the hydrolytic precipitation of Cr(III) from stripped solution at pH ∼9.0, and Fe(III) from raffinate at pH 3.5 under continuous air-flow could yield the precipitates of Cr(OH)3 and FeOOH·2H2O, respectively. From the Fe-removed solution, a 5% stoichiometric excess of oxalic acid could effectively precipitate >99.8% zinc in 30 min at 50 °C." @default.
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- W2890764051 date "2019-01-01" @default.
- W2890764051 modified "2023-10-06" @default.
- W2890764051 title "Hydrometallurgical valorization of chromium, iron, and zinc from an electroplating effluent" @default.
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- W2890764051 doi "https://doi.org/10.1016/j.seppur.2018.09.050" @default.
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