...When this solution is treated with alkali or ammonia, a yellow precipitate of diuranate (Na 2 U 2 O 7 , (NH 4 ) 2 U 2 O 7 ) is obtained. This intermediate product is called yellow cake or uranium concentrate, and contains 70-80% uranium (U 3 O 8 equivalent). If the hydrochloric acid extract or the hydrochloric acid solution of the yellow cake is further reduced by electrolysis, the uranium becomes the tetravalent ion U 4+ , and by treating this with hydrogen fluoride, a precipitate of uranium tetrafluoride UF 4 is obtained. ... *Some of the terminology explanations that mention "yellow-cake" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…この溶液にアルカリやアンモニアを作用させると二ウラン酸塩(Na2U2O7,(NH4)2U2O7)の黄色沈殿が得られる。この中間生成物がイェローケーキyellow‐cakeあるいはウラン精鉱と呼ばれるもので,これにはウランが70~80%(U3O8換算)含まれる。さらに先の塩酸抽出液,あるいはイェローケーキの塩酸溶液を電解還元すると,ウランは4価のイオンU4+となり,これにフッ化水素を作用させて四フッ化ウランUF4の沈殿を得る。… ※「yellow-cake」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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