发明申请
- 专利标题: Process for recovery of high purity uranium from fertilizer grade weak phosphoric acid
- 专利标题(中): 从肥料级弱磷酸回收高纯度铀的工艺
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申请号: US10486507申请日: 2004-02-11
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公开(公告)号: US20040247504A1公开(公告)日: 2004-12-09
- 发明人: Harvinderpal Singh , Shyamkant Laxmidutt Mishra , Anitha Mallavarapu , Vijayalakshmi Ravishankar , Ashok Giriyalkar , Manojkumar Kedarnath Kotekar , Tapan Kumar Mukherjee
- 主分类号: C22B060/02
- IPC分类号: C22B060/02
摘要:
A two-cycle countercurrent extraction process for recovery of highly pure uranium from fertilizer grade weak phosphoric acid. The proposed process uses selective extraction using di-(2-ethyl hexyl) phosphoric acid (D2EHPA) and tri-n-butyl phosphate (TBP) with refined kerosene as synergistic extractant system on hydrogen peroxide treated phosphoric acid, and stripping the loaded extract with strong phosphoric acid containing metallic iron to lower redox potential. The loaded-stripped acid is diluted with water back to weak phosphoric acid state and its redox potential raised by adding hydrogen peroxide and re-extracted with same extractant system. This extract is first scrubbed with sulfuric acid and then stripped with alkali carbonate separating iron as a precipitate, treated with sodium hydroxide precipitating sodium uranate, which is re-dissolved in sulfuric acid and converted with hydrogen peroxide to highly pure yellow cake of uranium peroxide.
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