Microwave pre-oxidation and biomass reduction were adopted to enhance the separation of titanium and iron in vanadium-titanium magnetite.The effects of microwave pre-oxidation temperature and time,as well as biomass r...Microwave pre-oxidation and biomass reduction were adopted to enhance the separation of titanium and iron in vanadium-titanium magnetite.The effects of microwave pre-oxidation temperature and time,as well as biomass reduction temperature and time,were investigated.The results showed that the average particle size of vanadium-titanium magnetite decreased,and the specific surface area increased with the increase in pre-oxidation temperature and time.The reaction pathway(Fe_(3-x)TixO_(4)→Fe_(2-x)TixO_(3)→Fe_(2)TiO_(5))was proved in microwave pre-oxidation process.The results of biomass reduction roasting showed that biomass reduction could effectively reduce ferric oxide to metallic iron while Ti was enriched in a solid solution of magnesium anosovite,which was beneficial to the subsequent grinding and acid leaching separation.The combined process of microwave pre-oxidation and biomass reduction achieved a high separation efficiency of titanium and iron in vanadium-titanium magnetite without forming complex titanium minerals.The titanium grade in the vanadium-titanium-rich material was 32.10%,and the recovery rate was 91.51%.The iron grade in the iron concentrate(metallic iron)was 90.90%,the recovery rate was 93.47%,and metallization rate was 93.87%.展开更多
基金This work was financially supported by the Hunan Province Key Research and Development Project(2023SK2079)and“Xiaohe”Young Talent Innovation Project in Changsha in 2023.
文摘Microwave pre-oxidation and biomass reduction were adopted to enhance the separation of titanium and iron in vanadium-titanium magnetite.The effects of microwave pre-oxidation temperature and time,as well as biomass reduction temperature and time,were investigated.The results showed that the average particle size of vanadium-titanium magnetite decreased,and the specific surface area increased with the increase in pre-oxidation temperature and time.The reaction pathway(Fe_(3-x)TixO_(4)→Fe_(2-x)TixO_(3)→Fe_(2)TiO_(5))was proved in microwave pre-oxidation process.The results of biomass reduction roasting showed that biomass reduction could effectively reduce ferric oxide to metallic iron while Ti was enriched in a solid solution of magnesium anosovite,which was beneficial to the subsequent grinding and acid leaching separation.The combined process of microwave pre-oxidation and biomass reduction achieved a high separation efficiency of titanium and iron in vanadium-titanium magnetite without forming complex titanium minerals.The titanium grade in the vanadium-titanium-rich material was 32.10%,and the recovery rate was 91.51%.The iron grade in the iron concentrate(metallic iron)was 90.90%,the recovery rate was 93.47%,and metallization rate was 93.87%.
