碳热还原条件下二氧化铈与碳的反应过程
来源期刊：中国有色金属学报1998年第3期
论文作者：任存治 涂赣峰 李春材 张成祥 金美慧
文章页码：511 - 514
关键词：稀土； 二氧化铈； 碳还原
Key words：rare earth； CeO2 ； carbon thermal reduction
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1 500～2 000 ℃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1～4 h。 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； 1 750～1 800 ℃温度范围内，CeO2被碳还原的产物为Ce2C2O2； 1 850 ℃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。
Abstract: In order to investigate the reaction procedure between CeO2 and C in the process of carbon thermal reduction, the CeO2 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 CeO2 were determined by XRD and chemical analysis methods. The results confirmed that the products of CeO2 reducted by C are Ce2O3 and Ce2C2O2 at the temperature range of 1500 to 1 700 ℃ and 1 750 to 1 800 ℃ respectively, CeC2 can be created rapidly at the temperature of 1 850 ℃. The procedure of CeO2 reacted with C is CeO2→Ce2O3→Ce2C2O2→CeC2 under the presented research conditions.
