氧化铝真空碳热还原热力学研究
首发时间:2013-01-21
摘要:真空条件能够有效地降低氧化铝碳热还原反应温度,改变氧化铝碳热还原产物。热力学分析表明,系统压力为30Pa,温度为1773K时,氧化铝与碳反应生成Al气体和Al2O气体,Al气体和Al2O气体从物料向外扩散过程中会与料块中大量存在的C接触并发生反应。CO(g)会与气相产物Al(g)或Al2O(g)在反应坩埚内发生反应。573K~1173K下,Al2O(g)会发生歧化分解反应。
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Investigation on carbothermal reduction dynamics of alumina in vacuum
Abstract:The vacuum conditions can effectively reduce alumina carbothermal reduction reaction temperature and change product composition. Thermodynamic analysis shows that under the system pressure of 30Pa and a temperature of 1,773 K, Al gas and Al2O gas will be present in large amounts when alumina is reduced by carbon. The outward diffusion of Al gas and Al2O gas from the material will occur and cause the reaction among Al gas, Al2O gas and carbon. Furthermore, CO gas can react with Al gas or Al2O gas in crucible. In the temperature range of 573K ~ 1173K, Al2O (g) occurs disproportionation decomposition reaction。
Keywords: Nnoferrous Metallurgy Alumina Thermodynamics
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