二氧化碳碳化法制备氧化镧粉体研究  

Preparation of Lanthanum Oxide Powder by Carbonation with Carbon Dioxide

作　　者：肖燕飞[1] 王猛[1] 冯宗玉[1] 黄小卫[1] 黄莉[1] 龙志奇[1] 

机构地区：[1]北京有色金属研究总院稀土材料国家工程研究中心 有研稀土新材料股份有限公司,北京100088

出　　处：《中国稀土学报》2014年第2期197-204,共8页Journal of the Chinese Society of Rare Earths

基　　金：国家科技支撑课题(2012BAE01B02);国家自然科学基金项目(NSFC:50934004)资助

摘　　要：对二氧化碳直接碳化制备氧化镧粉体进行了研究,以氯化镧溶液和二氧化碳为原料,通过调控反应体系pH值制备获得稀土碳酸盐,再经过焙烧得到粒径小、粒度分布窄的氧化镧粉体。研究表明:在不同反应温度和pH条件下,通过碳化法可以获得不同形貌的前驱体,其中控制反应温度为25℃,pH为5的条件下,可以获得片状碳酸镧前驱体;经XRD,FI-IR,TG-DSC分析表征,确定该前驱体化学组成为La2(CO3)3·3.2H2O;通过焙烧可获得中值粒径D50为4.75μm,粒度分布(D90-D10)/(2×D50)<1.00的氧化镧粉体。二氧化碳碳化法制备氧化镧粉体技术具有条件温和、产品粒径小、粒度分布窄、易规模化生产的优点,而且可以实现二氧化碳循环利用以减少温室效应。The carbonation method with carbon dioxide to prepare lanthanum oxide powder was studied. Using lan- thanum chloride solution and carbon dioxide as raw materials, lanthanum carbonate was synthesized by varying pH and temperature of the reaction system, and then calcined to obtain lanthanum oxide with small particle size and narrow distribution. The results showed that lanthanum carbonate precursors with lamellar morphology prepared in pH 5 and 25℃ was determined to be La2 （CO3）3·3.2H2O by means of XRD, TG analysis and FT-IR spectrosco- py. Well-crystallized lanthanum oxide with median size 4.75 um and particle size distribution less than 1.00 was obtained by calcinations of La2 （CO3 ）3·3.2H2O at 800 ℃ for 1.5 h. The carbonation method for lanthanum oxide powder would provide significant benefits containing mild reaction conditions, low cost, and product with small particle size and narrow distribution, easy to achieve large-scale production. More important, carbon dioxide could be recycled from waste gas which was beneficial to reduce the greenhouse effect in the carbon dioxide carbonation method.

关 键 词：碳化 氧化镧 二氧化碳 稀土 

分 类 号：O614.331[理学—无机化学]