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Journal of Thermal Analysis and Calorimetry

, Volume 134, Issue 3, pp 1863–1872 | Cite as

Recycling the industrial waste ZnFe2O4 from hot-dip galvanization sludge

  • Fanni Fekete
  • Károly Lázár
  • Anna Mária Keszler
  • Anna Jánosity
  • Li Zhibin
  • Imre Miklós SzilágyiEmail author
  • László Kótai
Article

Abstract

In this study, the goal was to find lower temperature for separating the Zn and Fe content of ZnFe2O4 by sulfation reaction than previously achieved and to study the various reaction steps of sulfation. Hence, the reaction of ZnFe2O4 with Mohr’s salt containing iron(II), i.e., (NH4)2Fe(SO4)2·6H2O, and ammonium iron alum containing Fe(III), i.e., NH4Fe(SO4)2·12H2O, was studied. At first, the thermal decomposition of precursor salts in air was studied by TG/DTA-MS to find the proper temperature for sulfation. Then ZnFe2SO4/precursor salt mixtures with ratios 1:2 and 1:5 were prepared and annealed at 400, 425 and 450 °C. The solubility of the products obtained at different annealing temperatures in water (e.g., ZnSO4, FeSO4, Fe2(SO4)3) and in HCl (Fe2O3, ZnO, Fex(OH)ySO4, Znv(OH)wSO4 basic sulfates) was studied. The morphology and structure of the starting materials was investigated by SEM, XRD and FTIR, the crystalline phases after each annealing and washing step were studied by XRD. The Fe in the starting materials and the products obtained at 425 °C was measured by Mössbauer. Based on the obtained results, it was demonstrated that the sulfation reaction with ammonium iron sulfates could be performed at lower temperatures than with iron sulfates. It was possible to detect the reaction intermediates and to obtain information about the reaction intermediates. With our sulfation reaction, depending on the reaction conditions, it is possible to obtain Fe2O3 as final product, but the Zn and Fe metals can be obtained also as sulfates. Our results open up further possibilities to recycle the ZnFe2O4 waste material.

Keywords

ZnFe2O4 Sludge Sulfation TG/DTA-MS XRD FTIR SEM Mössbauer 

Notes

Acknowledgements

I. M. Szilágyi acknowledges a János Bolyai Research Fellowship of the Hungarian Academy of Sciences and an ÚNKP-18-4-BME-238 Grant supported by the New National Excellence Program of the Ministry of Human Capacities, Hungary. An NRDI K 124212 and an NRDI TNN_16 123631 Grant are acknowledged. The research within Project No. VEKOP-2.3.2-16-2017-00013 and GINOP-2.2.1-15-2017-00084 was supported by the European Union and the State of Hungary, co-financed by the European Regional Development Fund. The research reported in this paper was supported by the Higher Education Excellence Program of the Ministry of Human Capacities in the frame of Nanotechnology and Materials Science research area of Budapest University of Technology (BME FIKP-NAT).

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2018

Authors and Affiliations

  1. 1.Department of Inorganic and Analytical ChemistryBudapest University of Technology and EconomicsBudapestHungary
  2. 2.Department of Nuclear Analysis and Radiography, Centre for Energy ResearchHungarian Academy of SciencesBudapestHungary
  3. 3.Institute of Materials and Environmental Chemistry, Research Centre for Natural SciencesHungarian Academy of SciencesBudapestHungary
  4. 4.Jiangmen XuHong Magnets LtdJiangmen CityChina

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