期刊论文

Xia, L.-S.

中文

化学工程

1005-9954

2014

42

5

42-46

10.3969/j.issn.1005-9954.2014.05.011

湖南省高等学校科研重点资助项目（12A120）； 湖南省自然科学衡阳市联合基金重点资助项目（14JJ5019）；

本校为第一且通讯机构

在硝酸体系中,以铂黑为催化剂、肼为还原剂,在反应液初始铀酰浓度0.9 mol/L、初始肼浓度1.0 mol/L、初始硝酸浓度0.8 mol/L、铂黑用量（以反应液计）8×10-3g/mL的工艺条件下,根据体系中各反应的化学方程式推导出了单位体积物质的理论反应热计算公式,并计算出了反应时间在0.5—4 h过程中的理论反应热,同时通过自行设计的测量肼催化还原U（Ⅵ）制备U（Ⅳ）的反应热装置测量相同工艺条件下,40,50℃时不同时刻的反应温差,计算得到了肼催化还原U（Ⅵ）制备U（Ⅳ）的实际反应热,最后与计算的理论反应热进行对比,结果表明,在1 h内实验值与计算值基本吻合。

Under the conditions of initial U(VI) concentration 0.9 m/L, hydrazine 1.0 m/L, nitrate 0.8 m/L and Pt dosage 8×10-3 g/mL(as reaction liquid) in the nitrate media with Pt as catalyst and hydrazine as reduction, the theory reaction heat formula for unit volume was obtained according to the reaction equations in the system. On that basis, the theory reaction heat was got when the reaction time was from 0.5 h to 4 h. The difference of temperature was achieved in the same technological condition at the different time when the temperatures were 40,...