CAJ | 학술논문

利用自行研制的氟化挥发实验装置，通过 UF4和 F2之间的气-固反应制备 UF6。实验中将傅里叶红外光谱技术用于氟化过程的在线监测，并用 XRD 和 ICP-MS 分析方法对反应产物和氟化残余物进行了表征，在此基础上对工艺流程进行了评估。研究表明，氟化反应工艺合理、红外光谱技术在线监测方法可行。研究还表明低温下抽真空的方法能有效除去产物 UF6中的 HF 杂质。利用球形颗粒缩小未反应核模型，对实验数据进行拟合，得到反应温度300℃、氟气体积分数为5%时氟化反应速率常数为0.0027 min-1。
이용자행연제적불화휘발실험장치，통과 UF4화 F2지간적기-고반응제비 UF6。실험중장부리협홍외광보기술용우불화과정적재선감측，병용 XRD 화 ICP-MS 분석방법대반응산물화불화잔여물진행료표정，재차기출상대공예류정진행료평고。연구표명，불화반응공예합리、홍외광보기술재선감측방법가행。연구환표명저온하추진공적방법능유효제거산물 UF6중적 HF 잡질。이용구형과립축소미반응핵모형，대실험수거진행의합，득도반응온도300℃、불기체적분수위5%시불화반응속솔상수위0.0027 min-1。
The gas-solid reaction of uranium tetrafluoride (UF4 )with fluorine (F2 )resulting uranium hexafluoride (UF6 )has been investigated using self-developed fluoride volatility equipment.In this study,the Fourier transform infrared spectroscopy (FTIR)was used for in-situ monitoring of fluorination process,while X-ray diffraction (XRD)and inductively coupled plasma-mass spectrometry (ICP-MS)to characterize the reaction product and the residue.Based on the analytical data,the process designed for recovery of uranium by fluo-ride volatility was evaluated.The results show that the fluorination process,and the in-situ monitoring of process by FTIR are feasible.In addition,the hydrogen fluoride (HF)as an impurity in the product is removed effectively by vacuuming at low temperature.The kinetic data indicates that the rate constant of fluorination reaction is 0.002 7 min-1 at 300 ℃ and 0.2 L/min φ= 5% F2 by fitting the experimental data using the shrinking core model of spherical particles.