Purification of 233U from thorium and iron in the reprocessing of irradiated thorium oxide rods

被引：6

作者：

Govindan, P ^{[1
]}

Palamalai, A ^{[1
]}

Vijayan, KS ^{[1
]}

Raja, M ^{[1
]}

Parthasarathy, S ^{[1
]}

Mohan, SV ^{[1
]}

Rao, RVS ^{[1
]}

机构：

[1] Indira Gandhi Ctr Atom Res, Reproc Grp, Kalpakkam 603102, Tamil Nadu, India

来源：

JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY | 2000年 / 246卷 / 02期

关键词：

Oxide; Iron; Precipitation; Purification; Uranium;

D O I：

10.1023/A:1006792406950

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A two step precipitation using ammonium carbonate and oxalic acid as the precipitants for thorium and iron is developed for the purification of U-233. Ammonium carbonate is added to the feed to increase the pH of the solution. The effect of pH on the solubility of U; Th and Fe in an excess of ammonium carbonate is studied. This indicates that the solubility of Th and Fe is minimum at pH 7 and the recovery of uranium is maximum. The effect of the concentration of thorium and iron on the recovery of uranium at pH 7 is studied. This indicates that the ammonium carbonate precipitation tolerates 2 g/l of thorium and 10 g/l of iron keeping losses of uranium to a minimum. If the feed solution contains more than a tolerable concentration of thorium the precipitation is followed in two steps: (1) Bulk of the thorium is removed by oxalate precipitation, (2) the remaining thorium and iron in the supernatant are removed by ammonium carbonate precipitation. A flow sheet is proposed for the purification of U-233 from thorium and iron present in a strip product concentrate obtained during the reprocessing of irradiated thorium rods.

引用

页码：441 / 444

页数：4

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