METHOD OF REMOVING YTTRIUM FROM YTTRIUM-CONTAINING EUROPIUM OXIDE
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Dec 8, 2016
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Dec 8, 2016
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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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