【摘要】 将二氧化铈和石墨粉以１∶９的摩尔比配料，均匀混合并制团，在１５００～２０００℃的温度范围内及氩气保护下，于碳管炉内在不同温度下恒温反应１～４ｈ。利用ＸＲＤ和化学分析法确定反应产物的物相组成和二氧化铈的还原率，以探讨碳热还原过程中二氧化铈与碳的反应过程。结果表明：在本实验研究条件下，在１５００～１７００℃温度范围内，ＣｅＯ２被碳还原的产物为Ｃｅ２Ｏ３；１７５０～１８００℃温度范围内，ＣｅＯ２被碳还原的产物为Ｃｅ２Ｃ２Ｏ２；１８５０℃时，ＣｅＣ２即可迅速生成。ＣｅＯ２与碳的作用要经历ＣｅＯ２→Ｃｅ２Ｏ３→Ｃｅ２Ｃ２Ｏ２→ＣｅＣ２的反应过程。更多还原

【Abstract】 In order to investigate the reaction procedure between CeO 2 and C in the process of carbon thermal reduction, the CeO 2 and C(1∶9 mole ratio)were mixed homogeneously and pelletized, the pellets were reacted at the temperature rang of 1 500 to 2 000 ℃ for 1 to 4 hours in a carbon tube furnace at an atmosphere of argon. The phase composition and the reduction ratio of CeO 2 were determined by XRD and chemical anlaysis methods. The results confirmed that the products of CeO 2 reducted by C are Ce 2O 3 and Ce 2C 2O 2 at the temperature range of 1 500 to 1 700 ℃ and 1 750 to 1 800 ℃ respectively, CeC 2 can be created rapidly at the temperature of 1 850 ℃. The procedure of CeO 2 reacted with C is CeO 2→Ce 2O 3→Ce 2C 2O 2→CeC 2 under the presented reseach conditions.更多还原