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)


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.


Na4V2O7 Thermodynamic analysis TG-DSC Apparent activation energy 



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).


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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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