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Behaviors of vanadium and chromium in coal-based direct reduction of high-chromium vanadium-bearing titanomagnetite concentrates followed by magnetic separation
Zhao, Long-sheng1,2,3; Wang, Li-na2,3; Chen, De-sheng2,3; Zhao, Hong-xin2,3; Liu, Ya-hui2,3; Qi, Tao2,3
2015-04-01
Source PublicationTRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
ISSN1003-6326
Volume25Issue:4Pages:1325-1333
AbstractThe reduction behaviors of FeO center dot V2O3 and FeO center dot Cr2O3 during coal-based direct reduction have a decisive impact on the efficient utilization of high-chromium vanadium-bearing titanomagnetite concentrates. The effects of molar ratio of C to Fe n(C)/n(Fe) and temperature on the behaviors of vanadium and chromium during direct reduction and magnetic separation were investigated. The reduced samples were characterized by X-ray diffraction (XRD), scanning election microscopy (SEM) and energy dispersive spectrometry (EDS) techniques. Experimental results indicate that the recoveries of vanadium and chromium rapidly increase from 10.0% and 9.6% to 45.3% and 74.3%, respectively, as the n(C)/n(Fe) increases from 0.8 to 1.4. At n(C)/n(Fe) of 0.8, the recoveries of vanadium and chromium are always lower than 10.0% in the whole temperature range of 1100 1250 degrees C. However, at n(C)/n(Fe) of 1.2, the recoveries of vanadium and chromium considerably increase from 17.8% and 33.8% to 42.4% and 76.0%, respectively, as the temperature increases from 1100 degrees C to 1250 degrees C. At n(C)/n(Fe) lower than 0.8, most of the FeO center dot V2O3 and FeO center dot Cr2O3 are not reduced to carbides because of the lack of carbonaceous reductants, and the temperature has little effect on the reduction behaviors of FeO center dot V2O3 and FeO center dot Cr2O3, resulting in very low recoveries of vanadium and chromium during magnetic separation. However, at higher n(C)/n(Fe), the reduction rates of FeO center dot V2O3 and FeO center dot Cr2O3 increase significatly because of the excess amount of carbonaceous reductants. Moreover, higher temperatures largely induce the reduction of FeO center dot V2O3 and FeO center dot Cr2O3 to carbides. The newly formed carbides are then dissolved in the gamma(FCC) phase, and recovered accompanied with the metallic iron during magnetic separation.
KeywordHigh-chromium Vanadium-bearing Titanomagnetite Concentrates Coal-based Direct Reduction Magnetic Separation Reduction Behavior Vanadium Chromium
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1016/S1003-6326(15)63731-1
Indexed BySCI
Language英语
WOS KeywordSOLID-STATE REDUCTION ; MIXED PELLETS ; C SYSTEM ; SLAG ; PHASE ; TITANIUM ; NA2CO3 ; IRON
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000354034600038
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/16774
Collection湿法冶金清洁生产技术国家工程实验室
Affiliation1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Inst Proc Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China
3.Chinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Zhao, Long-sheng,Wang, Li-na,Chen, De-sheng,et al. Behaviors of vanadium and chromium in coal-based direct reduction of high-chromium vanadium-bearing titanomagnetite concentrates followed by magnetic separation[J]. TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA,2015,25(4):1325-1333.
APA Zhao, Long-sheng,Wang, Li-na,Chen, De-sheng,Zhao, Hong-xin,Liu, Ya-hui,&Qi, Tao.(2015).Behaviors of vanadium and chromium in coal-based direct reduction of high-chromium vanadium-bearing titanomagnetite concentrates followed by magnetic separation.TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA,25(4),1325-1333.
MLA Zhao, Long-sheng,et al."Behaviors of vanadium and chromium in coal-based direct reduction of high-chromium vanadium-bearing titanomagnetite concentrates followed by magnetic separation".TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA 25.4(2015):1325-1333.
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