废钒触媒提钒工艺研究

Study on Vanadium Extraction Process of Spent Vanadium Catalyst

废钒触媒中通常含五氧化二钒(V2O5)5%~10%,本研究系统考察了钠化焙烧-水浸、NaOH浸出和Na2CO3浸出等工艺对废钒触媒浸出率的影响。试验结果表明,随着废钒触媒钠化焙烧Na2CO3含量增加,钒浸出率也逐渐提高,当Na2CO3含量为12%时,钒浸出率为83.14%,随着Na2CO3含量的进一步增加,钒浸出率升高的趋势变缓,当Na2CO3含量为20%时,钒浸出率为84.49%,综合考虑生产成本及后续提钒尾渣脱钠,废钒触媒钠化焙烧的碱含量应控制在12%左右;对比碳酸钠与氢氧化钠直接浸出两种工艺,两者对废钒触媒的浸出率在浓度为20%时,钒浸出率均在80%以上,但碳酸钠成本低廉,溶出杂质较少,且后续对接现有工艺更为容易。

The spent vanadium catalyst usually contains five oxidation of two vanadium 5% ~ 10%.The effects of sodium roasting-water leaching,NaOH leaching and Na2CO3 leaching on the leaching rate of vanadium catalyst are investigated in this study.The test results show that the leaching rate of vanadium is increased gradually with the increase of Na2CO3 content in spent vanadium catalyst.When the Na2CO3 content is 12%,the leaching rate of vanadium is 83.14%.With the further increase of Na2CO3 content,the trend of vanadium leaching rate increases slowly.When the Na2CO3content is 20%,the leaching rate of vanadium is 84.49%.Considering the production cost and the subsequent removal of sodium from the vanadium tailings,the alkali content of sodium vanadium catalyst roasting should be controlled at about 12%.Compared with the direct leaching of Na2CO3 and NaOH,the leaching rate of vanadium catalyst is more than 80%,when the thecontent of NaOH or Na2CO3 reaches 20%.But the cost of sodium carbonate is lower than sodium hydroxide,and it is easier to follow the existing process.