Adsorption Capacity of Organic Compounds Using Activated Carbons in Zinc Electrowinning

Jung Eun Park, Eun Ju Kim, Mi-Jung Park and Eun Sil Lee
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Jung Eun Park: Center for Plant Engineering, Institute for Advanced Engineering, Yongin-si 17180, Korea
Eun Ju Kim: Center for Plant Engineering, Institute for Advanced Engineering, Yongin-si 17180, Korea
Mi-Jung Park: WESCO Electrode, Changwon-si, Gyeongsangnam-do 642370, Korea
Eun Sil Lee: Center for Plant Engineering, Institute for Advanced Engineering, Yongin-si 17180, Korea

Energies, 2019, vol. 12, issue 11, 1-12

Abstract: The influence of adsorbate (D2EPHA and kerosene) on the process of zinc electrowinning from sulfuric acid electrolytes was analyzed. The main objective was to critically compare three factors: (1) Three types of activated carbon (AC); (2) adsorption temperatures and contact time; and (3) zinc recovery efficiency. The results showed that organic components reduced the efficiency of zinc recovery. Moreover, wood-based ACs had a higher adsorption capacity than coal- and coconut-based ACs. To maintain a removal efficiency of 99% or more, wood-based ACs should constitute at least 60% of the adsorbate. The temperature of adsorption did not affect the removal efficiency. Additionally, the feeding rate of adsorbate in the solvent was inversely proportional to the removal efficiency. A feeding rate of the liquid pump of over 3 mL/min rapidly increased the delta pressure. For the same contact time, 99% of adsorbate removal occurred at 1 mL/min compared to approximately 97% at 0.5 mL/min. In the presence of 100 mg/L zinc, with increasing adsorbate from 0–5%, the recovery efficiency of zinc decreased from 100% to 0% and the energy consumption increased from 0.0017–0.003 kwh/kg zinc. Considering the energy consumption and zinc deposit mass, 0.1% of the adsorbate is recommended for zinc electrowinning.

Keywords: zinc (Zn); electrowinning (EW); activated Carbons (ACs); adsorbate; liquid phase space velocity (LHSV); temperature (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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