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制备CeO₂纳米粉的溶解工艺对比

Comparison of Dissolving Processes for Preparation of Nano-CeO₂ Powers

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【Author】 ZHANG Xi-yan~(1,2),GAO Jie-ming~2,ZHOU Shi-jie~2,ZHANG Jin~3 (1. lnstitute of physical Sci. Eng. Tech., Guangxi University, Nanning 530004, China; 2. School of Materials Sci. and Eng.,Southwest Jiaotong University, Chengdu 610031, China; 3. School of Materials Sci. Eng., Chongqing Institute of Technolog, Chongqing 400050, China)

【机构】广西大学物理科学与工程技术学院；西南交通大学材料科学与与工程学院；重庆工学院材料科学与工程学院广西南宁530004西南交通大学材料科学与与工程学院四川成都610031；四川成都610031；重庆400050；

【摘要】通过实验比较制备纳米CeO2粉的HCl和HNO3溶解法.结果表明:用HCl溶解法溶解比例不超过25%,而且原料消耗大,产生氯气等有害气体对环境污染严重,不适合批量生产;用HNO3溶解法,当温度为35～50℃,:VHNO3=0.125,反应时间60min时,溶解比例大于90%,并且节省原料,无污HNO3浓度为7.0～8.5mol/L,VH2O2染,得到的纳米粉颗粒均匀(粒径为30～40nm),可用于工业化生产.更多还原

【Abstract】 The dissolving processes with HCl and HNO₃ were compared experimentally. The proportion of dissolved CeO₂ with HCl was less than 25% accompanied with large consumption in raw materials and serious pollution by Cl₂, unsuitable for production. On the other hand, the proportion of CeO₂ dissolved with HNO₃ was over 90% in the following reaction conditions: temperature 35 to （50 ℃,） concentration of HNO₃: 7.0 to 8.5 mol/L, V_H₂O₂:V_HNO₃=0.125, dissolving time: 60 min. The resolved nano-powders were homogeneous and their grain sizes were in the range of 30 to 40 nm. HNO₃ dissolving process saves raw materials and there is no pollution, showing industrialized production.更多还原