摘要
用硝酸钕、硝酸铕和混合稀土硝酸盐 3种溶液模拟硝酸镅 (稀土 )溶液 ,研究了它们的微波脱硝转型行为。热分析结果表明 :这些稀土硝酸盐转型为氧化物的温度必须维持在 70 0～ 80 0℃之间 ;微波脱硝时 ,转型温度可维持在 5 2 0℃以上 ,此时 ,尚残留 3 0 %的挥发物未去除 ;微波脱硝后的产物送入快速升温电子炉中于 80 0℃下灼烧 1 5min ,残留的氮氧化物和水份可完全去除。灼烧后的产物保留了微波脱硝产品疏松多孔、易于取出的特性。经X射线衍射分析验证 ,产物与氧化稀土的化学结构完全相同。转型过程中 ,稀土近乎无损失。
Americium (rare earth) nitrate solution is simulated with solution of neodymium, europium and mixed rare earth nitrate, respectively. Their behavior of conversion in microwave heating process is studied. It is shown from thermal analyses, that the converting temperature from rare earth nitrates into their's oxides must be kept at 700～800 ℃. In the stage of denitration by microwave heating the converting temperature can be kept at 520 ℃ and about 30 % of volatilizable component is resided. The product of post denitration is calcined in an electronic fast heating device, and the residual NO x and H 2O can be fully eliminated. The characteristic of final product, such as loose porous, scraped out easily from the denitration vessel is held. The analysis results from X ray diffraction prove that the chemical structure of the product is the same as rare earth oxide.
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
2000年第4期322-327,共6页
Atomic Energy Science and Technology
