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公开(公告)号：US20180162741A1
公开(公告)日：2018-06-14
申请号：US15372573
申请日：2016-12-08
Inventor： TUNG-CHUN WU , HSIOU-JENG SHY , CHING-YU TSO , SHIEN-JEN YANG
CPC classification number: C01F17/0043 , B01D9/0004 , C01P2006/80 , C22B59/00 , C25B1/00 , Y02P10/234
Abstract: A purifying method of removing yttrium from a yttrium-containing europium oxide, including the steps of (A) dissolving a yttrium-containing europium oxide in a solvent to produce a saturated yttrium-containing europium compound solution; (B) performing a low-temperature recrystallization treatment on the saturated yttrium-containing europium compound solution to produce a europium-containing precipitate; (C) calcining the europium-containing precipitate, followed by dissolving the calcined europium-containing precipitate in an inorganic acid to produce a europium-containing metal functioning as an electrolyte; and (D) performing an electrochemical reduction process on the electrolyte which the europium-containing metal functions as, followed by introducing a precipitant thereto to produce a europium compound. The method removes yttrium from yttrium-containing europium oxide present in phosphor powder to purify europium oxide, thereby recycling, purifying and reusing europium valuable metal to reduce environmental pollution.
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公开(公告)号：US20170107597A1
公开(公告)日：2017-04-20
申请号：US14887896
申请日：2015-10-20
Inventor： MING-CHIN CHENG , TUNG-CHUN WU , CHING-YU TSO , HSIOU-JENG SHY , SHIEN-JEN YANG
CPC classification number: C22B59/00 , C22B3/065 , C22B3/44 , C22B7/007 , C22B9/04 , C22B9/05 , Y02P10/234
Abstract: A method of purifying yttrium involves purifying element yttrium by high-temperature saturated dissolution, low-temperature recrystallization, high-temperature reduction and vaporization-based removal of impurities, in a simple manner, and at a low cost, such that yttrium element is unlikely to be contaminated by any raw material used in a manufacturing process.
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