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Preparation of Na4V2O7 Powder by Solid-State Reaction

  • Guishang Pei
  • Junyi XiangEmail author
  • Zhongci Liu
  • Dapeng Zhong
  • Feifei Pan
  • Xuewei LvEmail author
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

As one of the critical intermediate compounds of the sodium roasting converter slag, sodium pyrovanadate (Na4V2O7) powder was synthesized by solid-state reaction using NaCO3 and V2O5 as raw materials in this study. The preparation was first evaluated by thermodynamic software FactSage® with the minimum Gibbs free energy principle. Effect of temperature (T) and partial pressure of carbon dioxide P(CO2) was analyzed, and the results indicated that the reaction proceeds extensively with increasing temperature and reducing P(CO2). TG-DSC was applied to further characterize the preparation process, and it can be found that the reaction proceeds extensively near 540 °C corresponding to carbon dioxide gas escaping. Non-isothermal kinetics with a single scan rate was applied to the solid-state reaction, the average apparent activation energy was obtained using Freeman–Carroll method, equal to 102 ± 6 kJ/mol by mathematic fitting. In addition, XRD further verified the phase composition of Na4V2O7, and a large number of voids were detected from SEM images caused by the gas release.

Keywords

Na4V2O7 Thermodynamic analysis TG-DSC Apparent activation energy 

Notes

Acknowledgements

This work was supported by the National Key R&D Program of China (2018YFC1900500), China Postdoctoral Science Foundation (2018M640898), and Graduate Scientific Research and Innovation Foundation of Chongqing, China (Grant No. CYS19001).

References

  1. 1.
    Tavakoli MR, Dreisinger DB (2014) The kinetics of oxidative leaching of vanadium trioxide. Hydrometallurgy 147–148:83–89CrossRefGoogle Scholar
  2. 2.
    Xiang JY, Huang QY, Lv XW, Bai CG (2017) Multistage utilization process for the gradient-recovery of V, Fe, and Ti from vanadium-bearing converter slag, J Hazard Mater 3361Google Scholar
  3. 3.
    Xiang JY et al. (2019) A multi-step process for the cleaner utilization of vanadium-bearing converter slag. Paper presented at the 148st TMS Annual Meeting, San Antonio, Texas, 10–14 Mar 2019Google Scholar
  4. 4.
    Kolta GA, Hewaidy IF (1972) Phase diagrams of binary systems vanadium oxide-sodium carbonate and vanadium oxide-sodium sulfate 25(7):327–330Google Scholar
  5. 5.
    Slobodin BV, Fotiev AA (1965) Phase diagram of the Na2O-V2O5 system. Russ J Appl Chem 38(4):801–806Google Scholar
  6. 6.
    Wilson JR, Kerby RC (1973) Solid-liquid phase equilibria for the ternary systems V2O5-Na2O-Fe2O3, V2O5-Na2O-Cr2O3, and V2O5-Na2O-MgO, Can J Chem 51:1032–1040Google Scholar
  7. 7.
    Pei GS et al (2019) A literature review of heat capacity measurements method. Paper presented at the 148st TMS Annual Meeting, San Antonio, Texas, 10–14 Mar 2019Google Scholar
  8. 8.
    Pei GS, Xiang JY, Lv XW, Li G, Wu SS, Zhong DP, Lv W (2019) High-temperature heat capacity and phase transformation kinetics of NaVO3. J Alloy Compd 794:465–472CrossRefGoogle Scholar
  9. 9.
    Roscoe HR (1870) Philos Trans R Soc 160:317CrossRefGoogle Scholar
  10. 10.
    Bjoernberg A (1979) Multicomponent polyanions. 24. The crystal structure of Na4V2O7·(H2O)18. Acta Chem Scand Ser A 33:539Google Scholar
  11. 11.
    Florenskij K, Pkomarov B, Vvolkov V, Pnikolaeva O, Vkudryashova A, Fbashkirova A, Schajkina E A SU736751A1 pyro:vanadium-is used as colour indicator for high-temp. gas redox mediumGoogle Scholar
  12. 12.
    Kolta GA, Hewaidy IF, Felix NS, Girgis NN (1973) Reactions between sodium carbonate and vanadium pentoxide. Thermochim Acta 6(2):165–177CrossRefGoogle Scholar
  13. 13.
    Flynn JH (1992) Thermal analysis kinetics-past, present and future. Thermochim Acta 203:519–526CrossRefGoogle Scholar
  14. 14.
    Friedman HL (1967) J Macromolecular Sci Chem 41:57CrossRefGoogle Scholar
  15. 15.
    Reich L, Levi W (1968) Macromolacular review. Wiley-Interscience, New York, p 173Google Scholar
  16. 16.
    Ma RP, Felder RM, Ferrell JK (1988) Modelling a pilot-scale fluidized bed coal gasification reactor. Fuel Process Technol 19(3):165–290CrossRefGoogle Scholar
  17. 17.
    Henderson DW (1979) Thermal analysis of non-isothermal crystallization kinetics in glass forming liquids. J Non-Cryst Solids 30:301–315CrossRefGoogle Scholar
  18. 18.
    Ding CY, Lv XW, Chen Y, Bai CG (2016) Crystallization kinetics of 2CaO·Fe2O3 and CaO·Fe2O3 in the CaO-Fe2O3 system. ISIJ Int 56:1157–1163CrossRefGoogle Scholar
  19. 19.
    Balamurugan GP, Maiti SN (2010) Nonisothermal crystallization kinetics of polyamide 6 and ethylene-co-butyl acrylate blends. J Appl Polym Sci 107:2414–2435CrossRefGoogle Scholar
  20. 20.
    Mccune RC, Wynblatt P (1983) J Am Ceram Soc 66:111CrossRefGoogle Scholar

Copyright information

© The Minerals, Metals & Materials Society 2020

Authors and Affiliations

  1. 1.The State Key Laboratory of Mechanical TransmissionsChongqing UniversityShapingba District, ChongqingChina
  2. 2.College of Materials Science and EngineeringChongqing UniversityShapingba District, ChongqingChina
  3. 3.Chongqing Key Laboratory of Vanadium-Titanium Metallurgy and New MaterialsChongqing UniversityChongqingChina

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