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Method for recovering yttrium and europium in waste fluorescent powder to prepare yttrium europium oxide

A technology of yttrium europium oxide and fluorescent powder, which is applied in chemical instruments and methods, zinc sulfide, luminescent materials, etc., can solve the problems of high acid consumption and long reaction time, and achieve the effect of reducing acid consumption and recycling cost

Active Publication Date: 2012-12-26
SICHUAN CHANGHONG ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, wet methods are generally used for the recovery of fluorescent powder, which not only takes a long time to react, but also consumes a lot of acid.

Method used

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  • Method for recovering yttrium and europium in waste fluorescent powder to prepare yttrium europium oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] a. Weigh 50.0 g of waste fluorescent powder, which contains 9.60 g of yttrium, 0.75 g of europium and 14.0 g of zinc by weight. Ammonium chloride and potassium pyrosulfate are mixed evenly with waste fluorescent powder in a powder mixer according to the mass ratio of waste phosphor: ammonium chloride: potassium pyrosulfate = 1:6:0.1, and then placed in a roasting furnace at 350°C Keep warm for 20 minutes to allow the fluorescent powder to fully react. The roasting furnace is heated up to 500° C., and then the reacted solid is put into the roasting furnace, and kept at 500° C. for 10 minutes.

[0045] b. Add deionized water according to the solid-to-liquid ratio of 1g:5ml, soak the solid after the final reaction in step a, and filter to obtain 18.30g of yttrium and europium-containing solution and undissolved phosphor powder.

[0046] c. Adjust the pH of the solution to 2.5, then add 3.11 g of sodium sulfide to remove a small amount of impurities such as iron, zinc, cad...

Embodiment 2

[0051] a. Weigh 75.0 g of waste fluorescent powder, which contains 14.25 g of yttrium, 1.16 g of europium and 21.75 g of zinc by weight. Ammonium chloride and potassium pyrosulfate are mixed evenly with waste fluorescent powder in a powder mixer according to the mass ratio of waste phosphor: ammonium chloride: potassium pyrosulfate=1:8:0.08, and then placed in a roasting furnace at 370°C Keep warm for 30 minutes to allow the fluorescent powder to fully react. The roasting furnace is heated up to 525° C., and then the reacted solid is put into the roasting furnace, and kept at 525° C. for 5 minutes.

[0052] b. Add deionized water according to the solid-to-liquid ratio of 1g: 15ml, soak the solid after the final reaction in step a, and filter to obtain 28.33g of yttrium and europium-containing solution and undissolved phosphor powder.

[0053] c. Adjust the pH of the solution to 2.2, then add 3.89 g of sodium sulfide to remove a small amount of impurities such as iron, zinc, c...

Embodiment 3

[0058] a. Weigh 100.0 g of waste fluorescent powder, which contains 23.15 g of yttrium, 1.23 g of europium and 11.38 g of zinc by weight. Ammonium chloride and potassium pyrosulfate are mixed evenly with waste fluorescent powder in a powder mixer according to the mass ratio of waste phosphor: ammonium chloride: potassium pyrosulfate = 1:10:0.1, and then placed in a roasting furnace at 390°C Keep warm for 45 minutes to allow the fluorescent powder to fully react. The roasting furnace is heated up to 550° C., and then the reacted solid is put into the roasting furnace, and kept at 550° C. for 5 minutes.

[0059] b. Add deionized water according to the solid-to-liquid ratio of 1g: 25ml, soak the solid after the final reaction in step a, and filter to obtain 19.89g of yttrium and europium-containing solution and undissolved phosphor powder.

[0060] c. Adjust the pH of the solution to 2.8, then add 6.17 g of sodium sulfide to remove a small amount of impurities such as iron, zinc...

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Abstract

The invention discloses a method for recovering yttrium and europium in waste fluorescent powder to prepare yttrium europium oxide, and belongs to the technical field of waste recovery. The method includes following steps: a. mixing the waste fluorescent powder, ammonium chloride and potassium pyrosulfate powder, and moving the mixture into a roasting furnace to be roasted at the temperature of 340-400 DEG C; b. water immersing solid after roasting, and then obtaining solution including the yttrium and the europium; c. adding sodium sulphide into the solution including the yttrium and the europium to refine; and d. the potential of hydrogen (PH) value of the solution after refinement is adjusted to range from 1.5 to 2, and then adding oxalic acid to enable the yttrium and the europium to precipitate to obtain yttrium oxalate hydrate and oxalic acid europium. According to requirements of fluorescent powder of a color television or a three band fluorescent lamp for raw materials, at least one of the yttrium oxalate hydrate or the oxalic acid europium or yttrium oxide or europium oxide is added into the yttrium oxalate hydrate and the oxalic acid europium, and ytterbium europium oxide is obtained after the reaction. The method can reduce production cost, and improves the recovery rate of the yttrium and the europium; and the obtained ytterbium europium oxide can be directly used for preparing the fluorescent powder of the color television or the three band fluorescent lamp.

Description

technical field [0001] The invention belongs to the technical field of waste recovery in the household appliance industry, and in particular relates to a method for recovering yttrium and europium from waste fluorescent powder to prepare yttrium and europium oxide. Background technique [0002] Waste CRT TVs, waste PDP TVs, and tricolor fluorescent lamps all contain a large amount of rare earth elements. On average, each waste CRT TV contains about 8 grams of phosphor powder, and each waste PDP TV contains about 30 grams of phosphor powder. Powder 3 grams. Waste phosphors mainly contain rare earth elements yttrium and europium, in addition to rare earth elements such as cerium, terbium, and dysprosium. From the perspective of protecting rare earth resources, recycling rare earth resources, and environmental protection, it is imperative to recycle rare earth resources in phosphors. [0003] At present, wet methods are generally used for the recovery of fluorescent powder, w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/78C07C55/07C07C51/41C01F11/46C01G9/08
Inventor 潘晓勇彭玲陈伟华韦泽平陈正王婕
Owner SICHUAN CHANGHONG ELECTRIC CO LTD
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