| 摘要 |
<p>860,458. Concentration of plutonium. RITTER, D. M., and BLACK, R. P. S. Oct. 20, 1945 [Sept. 28, 1944], No. 27649/45. Drawings to Specification. Class 39(4). Plutonium is concentrated by a procedure which includes forming an oxalate carrier precipitate containing the plutonium, dissolving the precipitate in an alkaline solution, and adding an oxidising agent to oxidise the carrier but not the plutonium. A solution of neutronirradiated uranium is treated according to the bismuth phosphate precipitation process described in U.S.A. Specification 2,785,951, the precipitate is dissolved in acid, and the solution treated with oxalic acid and optionally potassium chloride. By adding uranous ions, uranous oxalate is precipitated carrying the plutonium and this precipitate is dissolved in alkaline carbonate or oxalate solution, followed by oxidation with hydroxylamine or hydrogen peroxide. The oxidised solution is neutralised with acid and a second uranous oxalate precipitation carried out, this precipitate being dissolved in nitric acid, and the plutonium further concentrated by lanthanum fluoride precipitation. Other oxalate carrier precipitates referred to are thorium oxalate and lanthanum oxalate.</p> |
