Production of zinc oxide from hazardous waste - Sal Ammoniac Skimming
| Autor: | Martina Laubertova, Dusan Orac, Jarmila Trpčevská, B. Holkova, H. Horvathova, Jana Pirošková |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
lcsh:TN1-997
Waste management Chemistry Metals and Alloys zinc oxide chemistry.chemical_element Zinc precipitation Geotechnical Engineering and Engineering Geology leaching chemistry.chemical_compound Mechanics of Materials Hazardous waste Materials Chemistry Sal Ammoniac Skimming Sal ammoniac lcsh:Mining engineering. Metallurgy |
| Zdroj: | Journal of Mining and Metallurgy. Section B: Metallurgy, Vol 54, Iss 3, Pp 377-384 (2018) |
| ISSN: | 2217-7175 1450-5339 |
| Popis: | This article deals with hydrometallurgical treatment with the subsequent precipitation of zinc from hazardous waste Sal- Ammoniac Skimming produced in wet hot-dip galvanizing process. Chemical analysis showed that skimming contained 46.64% Zn. X-ray diffraction analysis identified the Zn(OH)Cl phase (96.36%) and NH4Cl (3.64%) in Sal-Ammoniac Skimming. The skimming was first subjected to leaching in order to extract zinc into the solution containing HCl, followed by precipitation of the zinc. The experiments were performed in a medium of HCl at concentrations of 0.25, 0.5, 1 and 2M. Complete dissolution of zinc was achieved in 0.5M HCl solution, at 40?C, L:S=20, max. 30 min. The apparent activation energy of leaching reaction by hydrochloric acid solution was Ea=5.543 kJ mol-1. Zn precipitation was carried out using Na2CO3 and NaOH. Zinc oxide with a purity of about 99% was obtained directly from the solution of 6M NaOH at a temperature of 60?C ? 80?Cat pH 8.8. |
| Databáze: | OpenAIRE |
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