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1. 发明授权

US5702676A Production method for obtaining pressable powder yielding high sinter density pellets without defects 失效
标题翻译：获得可产生高烧结密度的颗粒的可压制粉末的生产方法，没有缺陷
公开(公告)号：US5702676A
公开(公告)日：1997-12-30
申请号：US667795
申请日：1996-06-20
申请人： Richard I. Larson , Stephen E. Selby , Michael P. Enger
发明人： Richard I. Larson , Stephen E. Selby , Michael P. Enger
IPC分类号： C01G43/025
CPC分类号： C01G43/025 , C01P2006/10 , C01P2006/12
摘要： This invention provides an improved process of preparing UO.sub.2 powder from poor quality, partially oxidized powder containing organic and inorganic impurities. The process is illustrated in the flow chart of FIG. 1 which includes the steps of (a) oxidizing a uranium-containing scrap also containing inorganic and cationic organic impurities; (b) solubilizing, typically with nitric acid, the uranium contained in the oxidized scrap to produce uranyl nitrate; (c) solvent extracting the solubilized product of step (b) to remove cation impurities to provide a purified uranyl nitrate solution; (d) precipitating the purified uranyl nitrate with ammonia to form ammonium diuranate powder; and (e) calcining and passivating the ammonium diuranate powder to produce UO.sub.2 powder; and optionally (f) forming the UO.sub.2 powder of step (e) into pellets and sintering the formed pellets to produce sintered UO.sub.2 pellets.
摘要翻译：本发明提供了一种由劣质的部分氧化粉末制备含有机和无机杂质的氧化铝粉末的改进方法。该过程在图5的流程图中示出。 1，其包括以下步骤：（a）氧化含有无机和阳离子有机杂质的含铀废料; （b）通常用硝酸溶解氧化废料中所含的铀以产生硝酸铀酰; （c）溶剂萃取步骤（b）的溶解产物以除去阳离子杂质以提供纯化的硝酸铀酰溶液; （d）用氨沉淀净化的铀酰硝酸铀以形成十二烷酸铵粉末; 和（e）煅烧和钝化二异氰酸铵粉末以产生UO2粉末; 和（f）将步骤（e）的UO 2粉末形成颗粒并烧结所形成的颗粒以制备烧结的UO2颗粒。

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