| 二氧化硅在真空碳热-氯化法炼铝过程中的行为 |
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| 引用本文： | 袁海滨,李秋霞,朱富龙,杨斌,徐宝强,戴永年.二氧化硅在真空碳热-氯化法炼铝过程中的行为[J].中南大学学报(自然科学版),2012,43(3):803-808. |
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| 作者姓名： | 袁海滨 李秋霞 朱富龙 杨斌 徐宝强 戴永年 |
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| 作者单位： | 1. 昆明理工大学真空冶金国家工程实验室,云南省有色金属真空冶金重点实验室,云南昆明650093
2. 云南师范大学化学化工学院,云南昆明,650092 |
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| 基金项目： | 国家自然科学基金—云南联合基金重点资助项目(u0837604);高等学校博士学科点专项科研基金资助项目(20095314110003) |
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| 摘 要： | 采用XRD,EDS及热力学分析等方法,对二氧化硅在真空碳热-氯化法炼铝过程中的行为进行研究.研究结果表明:碳热还原过程SiO2在较低温度下发生碳热还原反应生成SiC,在更高的温度条件下碳热还原生成低价氧化硅SiO气体；另外还有一定量的SiC与Al4C3结合生成Al4SiC4.碳热还原过程生成的低价氧化硅SiO气体进入低温区歧解得到单质硅与二氧化硅；同时还有氧化铝碳热还原生成的低价氧化铝Al2O气体进入低温区与CO发生二次氧化反应生成氧化铝与碳,低价氧化铝Al2O与低价氧化硅SiO气体在低温区发生反应的可能性较小.碳热-氯化过程冷凝产物金属铝的EDS检测分析显示,SiO2碳热还原生成的低价氧化硅SiO歧解产物没有混入最终产物中,从而不会影响金属铝的纯度,该金属铝平均纯度达97.03％.
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| 关 键 词： | 真空冶金 氯化铝 二氧化硅 铝 |
Behavior of silica in vacuum metallurgy of aluminum production by carbothermic-chloride process |
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| YUAN Hai-bin
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LI Qiu-xia
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ZHU Fu-long
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YANG Bin
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XU Bao-qiang
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DAI Yong-nian.Behavior of silica in vacuum metallurgy of aluminum production by carbothermic-chloride process[J].Journal of Central South University:Science and Technology,2012,43(3):803-808. |
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| Authors: | YUAN Hai-bin LI Qiu-xia ZHU Fu-long YANG Bin XU Bao-qiang DAI Yong-nian |
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| Institution: | 1(1.National Engineering Laboratory for Vacuum Metallurgy,Key Laboratory for Nonferrous Metals Vacuum Metallurgy of Yunnan Province,Kunming University of Science and Technology,Kunming 650093,China;2.School of Chemistry and Chemical Engineering,Yunnan Normal University, Kunming 650092,China) |
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| Abstract: | The behavior of silica in vacuum metallurgy of aluminum production by carbothermic-chloride process was investigated by XRD,EDS and thermodynamic analysis.The results show that SiC is formed at low temperature by SiO2 carbothermic reduction during alumina carbothermic reduction process,SiO(g) is generated at higher temperature which would disproportion into simple substance of silicon and silica at low temperatures,and Al4SiC4 is formed by a certain SiC reacting with Al4C3.Reoxidation reaction could occur between Al2O(g) and CO,which is generated by alumina carbothermic reduction.However,little possibility of reaction occurs between SiO(g) and Al2O(g) at low temperature area.SiO(g) disproportion product didn’t enter into aluminum metals by EDS analysis for the condensation products during carbothermic-chloride process,which means that final products can not be polluted by it,and the average purity of aluminum metal attains 97.03%. |
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| Keywords: | vacuum metallurgy AlCl SiO2 aluminum |
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