Transformation and separation of metallic iron in reduced ilmenite during corrosion process
Fu‑qiang Zheng 1, Xia Liu2, Yu‑feng Guo 1, Shuai Wang 1, Feng Chen 1, Ling‑zhi Yang 1, Tao Jiang 1, Guan‑zhou Qiu 1
1 School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, Hunan, China; 2 Hunan Qingzhiyuan Environmental Protection Technology Co., Ltd., Changsha 410083, Hunan, China
Transformation and separation of metallic iron in reduced ilmenite during corrosion process
Fu‑qiang Zheng 1, Xia Liu2, Yu‑feng Guo 1, Shuai Wang 1, Feng Chen 1, Ling‑zhi Yang 1, Tao Jiang 1, Guan‑zhou Qiu 1
1 School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, Hunan, China; 2 Hunan Qingzhiyuan Environmental Protection Technology Co., Ltd., Changsha 410083, Hunan, China
摘要 The effects of corrosion temperature, oxygen flow rate and corrosion time on the transformation of metallic iron were systematically studied, and the effects of mineral phases of Fe-bearing products on Ti–Fe separation were investigated. The reaction mechanism of metallic iron in corrosion process was proposed. The results showed that corrosion temperature played a key role in determining the transformation of metallic iron in reduced ilmenite during corrosion process. Under suitable corrosion conditions, Fe-bearing mineral in reduced ilmenite could be converted to amorphous ferric hydroxide, lepidocrocite, hematite and magnetite, respectively, and lepidocrocite was the most easily separated Fe-bearing mineral from corrosion products owing to the significant density difference between lepidocrocite and Ti-rich materials. The Ti-rich material with 77.81 wt.% TiO2 and Fe-bearing product with 52.69 wt.% total Fe were obtained by gravity separation. The Ti recovery ratio and Fe recovery ratio were 91.16% and 86.27%, respectively.
Abstract：The effects of corrosion temperature, oxygen flow rate and corrosion time on the transformation of metallic iron were systematically studied, and the effects of mineral phases of Fe-bearing products on Ti–Fe separation were investigated. The reaction mechanism of metallic iron in corrosion process was proposed. The results showed that corrosion temperature played a key role in determining the transformation of metallic iron in reduced ilmenite during corrosion process. Under suitable corrosion conditions, Fe-bearing mineral in reduced ilmenite could be converted to amorphous ferric hydroxide, lepidocrocite, hematite and magnetite, respectively, and lepidocrocite was the most easily separated Fe-bearing mineral from corrosion products owing to the significant density difference between lepidocrocite and Ti-rich materials. The Ti-rich material with 77.81 wt.% TiO2 and Fe-bearing product with 52.69 wt.% total Fe were obtained by gravity separation. The Ti recovery ratio and Fe recovery ratio were 91.16% and 86.27%, respectively.
Fu‑qiang Zheng,Xia Liu,Yu‑feng Guo, et al. Transformation and separation of metallic iron in reduced ilmenite during corrosion process[J]. Journal of Iron and Steel Research International, 2020, 27(12): 1372-1381.
2020, Vol. 27 
