中國的釩鈦磁鐵礦（VTM）是典型的復(fù)雜多金屬有價礦物資源。目前VTM精礦中有價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入高爐渣而難以回收,同時,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,浸出殘渣即為目標(biāo)產(chǎn)物。弱還原可以破壞VTM的穩(wěn)定結(jié)構(gòu),促進鐵在弱酸中的浸出,實現(xiàn)TiO2的富集。本文主要結(jié)果如下:VTM精礦經(jīng)還原后,大部分鐵在浸出過程中會轉(zhuǎn)移至液相,獲得富含TiO2的殘渣。結(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。浸出殘渣含少量水合水,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。通過測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... 

【文章來源】：中國科學(xué)院大學(xué)(中國科學(xué)院過程工程研究所)北京市

【文章頁數(shù)】：96 頁

【學(xué)位級別】：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


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