High-quality ferrovanadium nitride(FeV45N,FeV55N and Fe65N)was fabricated using the raw materials of Fe_(3)O_(4),V_(2)O_(5) and graphite via carbothermal reduction nitridation method.Compared with the traditional meth...High-quality ferrovanadium nitride(FeV45N,FeV55N and Fe65N)was fabricated using the raw materials of Fe_(3)O_(4),V_(2)O_(5) and graphite via carbothermal reduction nitridation method.Compared with the traditional methods,it shortens the production process of ferrovanadium nitride by avoiding the preparation of ferrovanadium.The effects of C/O molar ratio and reaction temperature on phase transition,density,carbon,oxygen and nitrogen contents and microstructure were investigated.The appropriate C/O molar ratio is crucial to obtain the products with high nitrogen content.It is also found that a higher temperature is beneficial for the densification,and the density of the products obtained at 1550℃ is much higher than that at 1500℃.Moreover,a higher temperature contributes to the increase in nitrogen content owing to the higher reaction kinetics.The carbothermal reduction nitridation method is proved to be a facile route to fabricate cost-effective ferrovanadium nitride and is possible to be applied for industrial production.展开更多
A commercial process was developed to treat a Ca-based Mo-V residue generated in Mo processing plant. Vanadium wasselectively leached using acetic acid and recovered as iron vanadate by hydro process. Process conditio...A commercial process was developed to treat a Ca-based Mo-V residue generated in Mo processing plant. Vanadium wasselectively leached using acetic acid and recovered as iron vanadate by hydro process. Process conditions for selective V leachingand iron vanadate precipitation were investigated. V recovery efficiency of 90.3% was achieved with a V content of 26.5% and an Fecontent of 29% in the iron vanadate cake suitable for ferrovanadium industry. The overall Mo recovery in the whole process was98.6%. The obtained leach residue containing 14.3% Mo with negligible impurities can be used as a feed material for the Moproduction process or ferromolybdenum industry. This simple and economical process generates two product streams from a singleoperation and has the potential to solve a long standing problem of handling such a mixed Mo？V residue.展开更多
基金The authors gratefully acknowledge financial support from the National Natural Science Foundation of China(Grant No.51734002).
文摘High-quality ferrovanadium nitride(FeV45N,FeV55N and Fe65N)was fabricated using the raw materials of Fe_(3)O_(4),V_(2)O_(5) and graphite via carbothermal reduction nitridation method.Compared with the traditional methods,it shortens the production process of ferrovanadium nitride by avoiding the preparation of ferrovanadium.The effects of C/O molar ratio and reaction temperature on phase transition,density,carbon,oxygen and nitrogen contents and microstructure were investigated.The appropriate C/O molar ratio is crucial to obtain the products with high nitrogen content.It is also found that a higher temperature is beneficial for the densification,and the density of the products obtained at 1550℃ is much higher than that at 1500℃.Moreover,a higher temperature contributes to the increase in nitrogen content owing to the higher reaction kinetics.The carbothermal reduction nitridation method is proved to be a facile route to fabricate cost-effective ferrovanadium nitride and is possible to be applied for industrial production.
文摘A commercial process was developed to treat a Ca-based Mo-V residue generated in Mo processing plant. Vanadium wasselectively leached using acetic acid and recovered as iron vanadate by hydro process. Process conditions for selective V leachingand iron vanadate precipitation were investigated. V recovery efficiency of 90.3% was achieved with a V content of 26.5% and an Fecontent of 29% in the iron vanadate cake suitable for ferrovanadium industry. The overall Mo recovery in the whole process was98.6%. The obtained leach residue containing 14.3% Mo with negligible impurities can be used as a feed material for the Moproduction process or ferromolybdenum industry. This simple and economical process generates two product streams from a singleoperation and has the potential to solve a long standing problem of handling such a mixed Mo？V residue.
