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Morphological Changes of Panzhihua Ilmenite During Oxidation Treatment
Zhang, Jianbo1,2; Zhu, Qingshan1; Xie, Zhaohui1; Lei, Chao1; Li, Hongzhong1
2013-08-01
Source PublicationMETALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
Volume44Issue:4Pages:897-905
AbstractMorphological changes with the phase transitions were investigated in detail for the oxidation roasting of Panzhihua ilmenite in air from 873 K to 1173 K (600 A degrees C to 900 A degrees C). It was found that a thin hematite layer of 1 to 2 mu m formed rapidly at the initial stage of the oxidation process, independent of the oxidation temperature, on the surface of ilmenite particles, and the thickness of the hematite layer kept nearly constant with increasing time of oxidation. The morphology inside an ilmenite particle, however, changed with the oxidation temperature. Needlelike rutile network enwrapped by hematite grains was observed after oxidation below 1073 K (800 A degrees C), and the structure can be well preserved during the oxidation process, although grain growth of rutile and hematite did occur with the extension of the oxidation time. The morphological changes at 1073 K (800 A degrees C) and higher showed two distinct stages, where in the first stage ilmenite was oxidized to form rutile and hematite with morphology similar to that of oxidation below 1073 K (800 A degrees C). The as-formed rutile and hematite were not stable and recombined to form pseudobrookite in the second stage, which caused significant morphology change; i.e., the needlelike rutile network gradually "dissolved" to form the final morphology of irregular rutile grains dispersed in the pseudobrookite matrix with some isolated hematite grains. Moreover, the oxidation temperature also has a great effect on the rate of morphological changes, i.e., the increased evolution rate with increasing the oxidation temperature.
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
Indexed BySCI
Language英语
WOS KeywordREDUCTION ; KINETICS ; PREOXIDATION ; HYDROGEN
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000321669900015
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/13596
Collection研究所(批量导入)
Affiliation1.Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Jianbo,Zhu, Qingshan,Xie, Zhaohui,et al. Morphological Changes of Panzhihua Ilmenite During Oxidation Treatment[J]. METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE,2013,44(4):897-905.
APA Zhang, Jianbo,Zhu, Qingshan,Xie, Zhaohui,Lei, Chao,&Li, Hongzhong.(2013).Morphological Changes of Panzhihua Ilmenite During Oxidation Treatment.METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE,44(4),897-905.
MLA Zhang, Jianbo,et al."Morphological Changes of Panzhihua Ilmenite During Oxidation Treatment".METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE 44.4(2013):897-905.
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