中國(guó)的釩鈦磁鐵礦（VTM）是典型的復(fù)雜多金屬有價(jià)礦物資源。目前VTM精礦中有價(jià)元素回收利用的典型技術(shù)為高爐法。然而,采用這種冶煉方法,精礦中的鈦元素基本進(jìn)入高爐渣而難以回收,同時(shí),高爐法的釩回收率也較低。為獲得優(yōu)質(zhì)的TiO2富集料用于鈦提取,本論文設(shè)計(jì)了一種提鈦新工藝。主要技術(shù)手段是利用還原劑（碳或氫）弱還原VTM精礦后,經(jīng)稀硫酸浸出,浸出殘?jiān)礊槟繕?biāo)產(chǎn)物。弱還原可以破壞VTM的穩(wěn)定結(jié)構(gòu),促進(jìn)鐵在弱酸中的浸出,實(shí)現(xiàn)TiO2的富集。本文主要結(jié)果如下:VTM精礦經(jīng)還原后,大部分鐵在浸出過(guò)程中會(huì)轉(zhuǎn)移至液相,獲得富含TiO2的殘?jiān)＝Y(jié)果表明,還原程度與后續(xù)的浸出效果密切相關(guān)。優(yōu)化條件為:還原溫度1000℃,保護(hù)氣氛下還原3h,配碳量為VTM精礦質(zhì)量的6%;在80℃下用0.2mol/L的H2SO4溶液（L/S比為100:1）浸出3-4 h。浸出殘?jiān)倭克纤?由銳鈦礦、Al2FeO4和Fe3O4組成。脫水后,TiO2含量為72.2wt%,主物相為金紅石,伴生相為Fe2TiO5和Fe2O3。通過(guò)測(cè)定不同碳量還原后的相組成,得出鐵的還原途徑為原始磁鐵礦→Fe2.75Ti0.25O4→Fe2.5Ti... 

【文章來(lái)源】：中國(guó)科學(xué)院大學(xué)(中國(guó)科學(xué)院過(guò)程工程研究所)北京市

【文章頁(yè)數(shù)】：96 頁(yè)

【學(xué)位級(jí)別】：碩士

【文章目錄】：
摘要
Abstract
Annotations of Symbols
1 Introduction
    1.1 Background
    1.2 Research Scope and Objectives
2 Background and Literature Review
    2.1 Brief Introduction of VTM
    2.2 Current Routes for the Utilization of the VTM
        2.2.1 Blast furnace (BF) smelting process
        2.2.2 Non-BF processes
    2.3 Research Progress on the Gas-based Reduction of VTM
    2.4 Summary of the Literature Review
3 Utilization of VTM by Partial Carbon Reduction and Mild AcidLeaching
    3.1 Introduction
    3.2 Experiment
        3.2.1 Materials
        3.2.2 Characterization of the VTM concentrates
        3.2.3 Experimental procedures
        3.2.4 Analysis methods
    3.3 Results and Discussion
        3.3.1 Direct leaching of VTM concentrates by mild acid without carbon reduction
        3.3.2 Reduction of VTM concentrates with carbon characterized by leachingperformance with mild acid
        3.3.3 Mild acid leaching of the reduced VTMs to concentrate titanium
        3.3.4 Characterizations under the optimized conditions
    3.4 Conclusions
4 Leaching of the Partially Reduced VTM by FeCl_3 Solution
    4.1 Introduction
    4.2 Experimental
        4.2.1 Materials
        4.2.2 Experimental procedures
        4.2.3 Analysis methods
    4.3 Results and Discussion
        4.3.1 Leaching of the reduced VTMs with different reduction degrees by FeCl_3solution
        4.3.2 The performance of other elements during FeCl_3 leaching after carbonreduction
        4.3.3 Combined leaching of carbon reduced VTM by FeCl_3 solution followed bymild H_2SO_4 solution
    4.4 Conclusions
5 Partial Reduction of VTM by H_2 Gas and the Effectiveness of MildAcid Leaching
    5.1 Introduction
    5.2 Experiment
        5.2.1 Materials
        5.2.2 Experimental procedures
        5.2.3 Analysis methods
    5.3 Results and Discussion
        5.3.1 Effect of reduction temperature and time on weight loss
        5.3.2 Leaching performance of the reduced VTMs with various reduction degrees
        5.3.3 Phase compositions of the reduced VTMs and the leaching residues
        5.3.4 Effect of acid intensity on the leaching of deep-reduced VTM
    5.4 Conclusions
6 Conclusions and Future Work
    6.1 Conclusions
    6.2 Future Work
References
Acknowledgements
The author's resume and a list of published papers and research resultsduring study


【參考文獻(xiàn)】：
期刊論文
[1]Thermodynamic studies on gas-based reduction of vanadium titano-magnetite pellets[J]. Jun-wei Chen,Yang Jiao,Xi-dong Wang.  International Journal of Minerals Metallurgy and Materials. 2019(07)
[2]A novel process for the recovery of iron,titanium,and vanadium from vanadium-bearing titanomagnetite:sodium modification–direct reduction coupled process[J]. Yi-min Zhang,Ling-yun Yi,Li-na Wang,De-sheng Chen,Wei-jing Wang,Ya-hui Liu,Hong-xin Zhao,Tao Qi.  International Journal of Minerals Metallurgy and Materials. 2017(05)
[3]Gas-based reduction of vanadium titano-magnetite concentrate: behavior and mechanisms[J]. Yu-lei Sui,Yu-feng Guo,Tao Jiang,Xiao-lin Xie,Shuai Wang,Fu-qiang Zheng.  International Journal of Minerals Metallurgy and Materials. 2017(01)
[4]Reduction roasting–magnetic separation of vanadium tailings in presence of sodium sulfate and its mechanisms[J]. Yu-Lei Sui,Yu-Feng Guo,Andrew Yakovlevich Travyanov,Tao Jiang,Feng Chen,Guan-Zhou Qiu.  Rare Metals. 2016(12)
[5]Metalizing reduction and magnetic separation of vanadium titano-magnetite based on hot briquetting[J]. Shuang-yin Chen,Man-sheng Chu.  International Journal of Minerals Metallurgy and Materials. 2014(03)
[6]濃硫酸焙燒高鈦渣的反應(yīng)動(dòng)力學(xué)（英文）[J]. 隋麗麗,翟玉春.  Transactions of Nonferrous Metals Society of China. 2014(03)
[7]釩鈦磁鐵礦金屬化球團(tuán)熔分及TiO2富集試驗(yàn)研究[J]. 楊雙平,汪劍,杜新,劉杰.  礦冶工程. 2014(01)
[8]Sticking of iron ore pellets in direct reduction with hydrogen and carbon monoxide:Behavior and prevention[J]. 易凌云,黃柱成,李鐵輝,姜濤.  Journal of Central South University. 2014(02)
[9]釩鈦磁鐵礦金屬化球團(tuán)熔分深還原試驗(yàn)研究[J]. 張宗旺,陳士朝,吳軒,郭振霆,楊華鈞,陳鋼.  鋼鐵研究. 2013(04)
[10]釩鈦磁鐵礦含碳球團(tuán)的還原機(jī)制[J]. 曹明明,張建良,邢相棟,王春龍,白亞楠,文永才.  鋼鐵. 2012(08)



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