Study of solid state interactions in the systems ZnFe2O4 - CaO, ZnFe2O4 - MgO and zinc cake with CaO and MgO

Peltekov, Alexander; Boyanov, B.

doi:10.2298/jmmb130624037p

Cited by 7 publications

(2 citation statements)

References 18 publications

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“…Peltekov and B.S. Boyanov [40] reported the formation of Ca-Fe-oxides solid solution by calcining at 900-1200°C. The formation of Ti-Fe-oxides solid solution was proved by M. Charilaou et al [41] to be impossible when calcination temperature was lower than 827°C.…”

Section: Characterization Of Fresh Catalystsmentioning

confidence: 99%

Fe catalysts for methane decomposition to produce hydrogen and carbon nano materials

Reddy

Harb

et al. 2017

Applied Catalysis B: Environmental

223

103

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Highlights  Regardless preparation methods and Fe loading, Fe-Al2O3 catalysts showed the best CMD performance.  The selective formation of CNTs over Fe-Al2O3 catalysts is also speculated to be vital for their good CMD activity.  The graphite is proposed to be spurted out from an unstable over-stoichiometric iron carbide Fe3C1+x decomposition back to Fe3C and C.  At a low SV of 1.875 L/gcat•h, this catalyst showed a stable methane conversion of c.a. 70% for as long as 400 min.

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Section: Characterization Of Fresh Catalystsmentioning

confidence: 99%

Fe catalysts for methane decomposition to produce hydrogen and carbon nano materials

Reddy

Harb

et al. 2017

Applied Catalysis B: Environmental

223

103

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“…In the third stage, from 470 to 670°C, a mass loss of 1.85% could be attributed to the conversion of ZnS into ZnO, and formation of new phase Fe 2 O 3 . ZnO continues to react with Fe 2 O 3 to form stable ZnFe 2 O 4 , 27–30 while impurities such as sulfur, lead, and arsenic are removed during the firing. The list of zinc sulfide concentrate reactions can be summarized as below:

PbS + 1 . {5O}_{2} ((), g) = PbO + {SO}_{2} ((), g)

2PbO + {2SO}_{2} ((), g) + O_{2} ((), g) = {2PbSO}_{4}

PbS + {2O}_{2} ((), g) = {PbSO}_{4}

ZnS + 1 . {5O}_{2} ((), g) = ZnO + {SO}_{2} ((), g)

2FeS + 3 . {5O}_{2} ((), g) = {Fe}_{2} O_{3} + {2SO}_{2} ((), g)

ZnO + {Fe}_{2} O_{3} = {ZnFe}_{2} O_{4}

In the fourth stage (720–1000°C), the mass loss of 2.43% could be attributed to the increase in content of ZnFe 2 O 4 and the formation of a new phase of Zn 2 SiO 4 .…”

Section: Resultsmentioning

confidence: 99%

Microwave absorption and roasting characteristics of zinc sulfide concentrate

Liu

Zhu

Zhang

et al. 2021

Asia-Pacific J Chem Eng

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A novel microwave roasting technology for formation of ZnO from zinc sulfide concentrate is presented. The dielectric properties and thermal behaviors of zinc sulfide concentrate and ZnS, CaO, MgO, ZnO, FeS, and ZnFe2O4, covering a temperature range of 25 to 1000°C at 2.45 GHz, are systematically investigated. The main microwave absorbing compounds are FeS and ZnS, while compounds like CaO, MgO, and SiO2 and other gangue exhibit poor absorbing properties. The sulfide concentrate temperature increase was divided into four stages, consistent with the dielectric properties. The morphology, phase and element contents of roasted were assessed covering the effect of roasting temperature, holding time, and particle size by SEM, XRD, and XRF. The optimal process conditions are roasting temperature 700°C, holding time 120 min, and the particle size less than 200 mesh. Microwave roasting mechanism shows microwave heat minerals (ZnS and FeS) selectively without heating gangue minerals (CaO, MgO, and SiO2), a significant temperature gradient develops between minerals. Thermal stress cause cracks effectively promote the dissociation of the monomers of useful minerals, increasing the interfacial area with O2, promoting the rate of desulfurization reaction. The work highlights harnessing microwave roasting as an effective and environmentally benign technology compared to conventional furnace technologies.

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Solid-Phase Interaction of Zinc Ferrite with Calcium Oxide

Yakornov,

Skopov

2024

Springer Proceedings in Materials

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Study of solid state interactions in the systems ZnFe2O4 - CaO, ZnFe2O4 - MgO and zinc cake with CaO and MgO

Cited by 7 publications

References 18 publications

Fe catalysts for methane decomposition to produce hydrogen and carbon nano materials

Fe catalysts for methane decomposition to produce hydrogen and carbon nano materials

Microwave absorption and roasting characteristics of zinc sulfide concentrate

Solid-Phase Interaction of Zinc Ferrite with Calcium Oxide

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