摘要
采用氯化铵氯化法制备了无水稀土氯化物LnCl3(Ln=La,Ce,Pr,Nd,Sm)。用热分析方法研究了单纯NH4Cl的热分解过程及NH4Cl氯化稀土氧化物的反应过程。结果表明,在N2气氛下加热NH4Cl,150℃开始分解,264℃基本分解完全。在研究温度范围内,用氯化铵氯化稀土氧化物,既有氯化铵直接参与的氯化反应发生,又有氯化铵热解产物HCl使稀土氧化物氯化的反应存在。轻稀土氧化物的氯化在300℃基本完全,继续升温,导致稀土氯化物的部分水解。反应的主要方式决定于原料的混合方式。与传统的研磨混匀法相比,采用氯化铵和稀土氧化物层铺的方法能够提高稀土氧化物的氯化产率。
Anhydrous lanthanide chlorides LnCl3 （Ln = La, Ce, Pr, Nd and Sin） were prepared from La203, CeO2, Pr6O11, Nd2O3 and Sm2O3 chlorinated by NH4Cl, respectively. The thermal decomposing process of pure NH4Cl was investigated by TG, and the thermal effect of chlorination of rare earth oxides by NH4Cl were investigated by TG and DSC. The result showed that NH4Cl begin to loss the weight at 150℃ and the large loss of weight ended at 264℃ when NH4Cl heated at the rate of 10℃/min in N2 atmosphere. For the chlorination, NH4Cl direcdy participate the chlorination reaction, and HCl decomposed from NH4Cl also contributes to the chlorination reaction. For the lighter rare earth oxides, the chlorination completed below 300℃ and the LnCl3 obtained can be hydrolyzed or oxided by H2O vapor if the temperature was continued to rise.
出处
《稀土》
EI
CAS
CSCD
北大核心
2008年第2期54-59,共6页
Chinese Rare Earths
关键词
稀土
氯化
无水稀土氯化物
NH4CL
rare earth
chlorination
ardlydrous lanthanide chloride
NH4Cl
