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肯尼亞天然金紅石礦流化床氯化率的研究
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國家自然科學基金（51374064，51004033，51074044，57304043）


Fluidized-Bed Chlorination Rates of Kenya Rutile Ore
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    摘要:

    對肯尼亞金紅石礦加碳氯化體系的熱力學和動力學進行了研究，分析表明，C在固相中過量，體系處于平衡態(tài)時，TiCl4和CO是僅有的2個穩(wěn)定的產(chǎn)物，增加C/TiO2比對產(chǎn)物組成影響不大；高溫時，TiO2與C和Cl2生成CO的方程是占主導地位的。本實驗提出了一個反應(yīng)速率模型，得到金紅石氯化率的公式，與實驗數(shù)據(jù)吻合較好。反應(yīng)速率與顆粒初始半徑和天然金紅石密度有關(guān)，在900 ℃到1000 ℃溫度范圍內(nèi)，表觀活化能為10.569 kJ/mol，擴散是反應(yīng)的主要控制步驟。得到了C-Cl2體系中氯氣反應(yīng)率表達式，氯氣反應(yīng)率取決于反應(yīng)程度、氯氣濃度和焦炭粒徑。

    Abstract:

    The thermodynamics and kinetics of natural rutile carbochlorination have been investigated in a fluidized-bed. Thermodynamic analysis of this system reveals that when C is excess in the solid phase, TiCl4 and CO are the only two stable products in the chemical equilibrium compositions system, and the increase of the ratio of C to TiO2 has little effect on the product composition. At high temperature, the reaction with CO as the product is the dominant reaction. This paper proposed a reaction rate model, and got a rutile chlorination rate formula, which is more consistent with experimental data. For the TiO2-C-Cl2 system, the reaction rate is dependent on both size and density of natural rutile. From 900 to 1000 oC, the apparent activation energy is 10.569 kJ/mol. In this temperature range, mass diffusion is the main reaction controlling step. The expression of the chlorine reaction rate in the C-Cl2 system was obtained, and it depends on the degree of reaction, Cl2 concentration and the size of coke.

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牛麗萍,張廷安,倪培遠,王文博,呂國志,周愛平.肯尼亞天然金紅石礦流化床氯化率的研究[J].稀有金屬材料與工程,2014,43(6):1377~1380.[Niu Liping, Zhang Tingan, Ni Peiyuan, Wang Wenbo, Lü Guozhi, Zhou Aiping. Fluidized-Bed Chlorination Rates of Kenya Rutile Ore[J]. Rare Metal Materials and Engineering,2014,43(6):1377~1380.]
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  • 收稿日期:2013-09-04
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  • 在線發(fā)布日期: 2014-11-13
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