用电位—温度平衡图探讨Al_2O_3碳热还原的热力学条件  

STUDY THERMODYNAMIC CONDITION OF CARBOTHERMIC METHOD FOR ALUMINA WITH THE POTENTIAL-TEMPERATURE EQUILIBRIUM DIAGRAM

作　　者：张鹤鸣[1] 张忠诚[1] 杜爱玲[1] 

机构地区：[1]山东工业大学化学工程系

出　　处：《山东工业大学学报》1995年第2期134-141,共8页

基　　金：山东省自然科学基金

摘　　要：通过绘制气相存在下的Ｏ－Ｃ－Ａｌ系电位－温度平衡图，对Ａｌ２Ｏ３碳热还原制铝的可能性从热力学角度进行了探讨．结果表明，还原反应可能分三步进行．当气态ＣＯ的分压为１．０１３２５×１０５Ｐａ时，生成液相铝的温度为２３８１Ｋ，对应的电极电位相对于标准氧电极为－１５７９ｍＶ．在还原过程中，铝会有可观的蒸发损失．Attempts to explore thermodynamically the possibility of production of carbothermal aluminium with E - T equilibrium diagram of the O-C-Al system in the presence of gaseous phase. The results indicate that the reducing reactions may include three steps.The producing temperature of liquid aluminium is 2381K and the corresponding potential versus standard oxygen electrode is - 1579mV under 1. 01325×105Pa partial pressure of carbon monoxide. During reducing process the reaction temperature must be controlled critically to decrease the evaporation losses of aluminium.

关 键 词：氧化铝 碳热还原 热力学 电位 温度 平衡图 

分 类 号：O614.31[理学—无机化学]