Method for extracting europium oxide and yttrium oxide from waste fluorescent powder

A technology of fluorescent powder and europium oxide, which is applied in the field of extraction of rare earth elements, can solve the problems of high recycling cost and long process flow, and achieve the effect of low extraction cost, short process flow, and simple and easy-to-control process conditions

Inactive Publication Date: 2015-04-22
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] However, this method of separating and recovering rare earth from waste rare earth luminescent materials has disadvantages such as long process flow and high recovery cost.

Method used

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  • Method for extracting europium oxide and yttrium oxide from waste fluorescent powder

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Effect test

Embodiment 1

[0055] The method for extracting europium oxide and yttrium oxide from waste fluorescent powder comprises following 7 steps:

[0056] 1) Alkali-adding and roasting step: according to the weight ratio between solid and liquid of 0.75:1, liquid sodium hydroxide is added to the waste fluorescent powder, and after granulation, it is roasted in a furnace;

[0057] 2) Chlorination leaching step: wash the roasted material with water; place the washed slag in a hydrochloric acid solution with a pH value of 3 at 85°C with chlorine gas for chlorination leaching, wash again and mix the leachate with the slag separation;

[0058] The chlorine gas is added in a ratio of 0.1:1 according to the mass ratio of chlorine element to waste fluorescent powder;

[0059] 3) Phosphate precipitation step: According to the molar ratio of phosphate and rare earth elements of 1.1-2:1, sodium phosphate is added to the above leaching solution, the reaction temperature is controlled at 90°C, the pH value is...

Embodiment 2

[0070] The method for extracting europium oxide and yttrium oxide from waste fluorescent powder comprises following 7 steps:

[0071] 1) Alkali-adding and roasting step: according to the weight ratio between solid and liquid of 0.75:1, liquid potassium hydroxide is added to the waste fluorescent powder, and it is roasted in a furnace after granulation;

[0072] 2) Chlorination leaching step: washing the roasted material with water;

[0073] The washed slag is chlorinated and leached with sodium chlorate in a sulfuric acid solution with a pH value of 3 at 75°C, washed again and the leaching solution is separated from the slag;

[0074] The sodium chlorate is added in a ratio of 0.2.5:1 by the mass ratio of chlorine element to waste fluorescent powder;

[0075] 3) Phosphate precipitation step: According to the molar ratio of phosphate and rare earth elements of 1.5:1, ammonium phosphate is added to the above leachate, the reaction temperature is controlled at 75 ° C, the pH val...

Embodiment 3

[0086] The method for extracting europium oxide and yttrium oxide from waste fluorescent powder comprises following 7 steps:

[0087] 1) Alkali-adding and roasting step: according to the weight ratio between solid and liquid of 0.85:1, add liquid barium hydroxide to the waste fluorescent powder, granulate and roast in the furnace;

[0088] 2) Chlorination leaching step: washing the roasted material with water;

[0089] The washed slag is chlorinated and leached with sodium hypochlorite in an acetic acid solution with a pH value of 3 at 80°C, washed again and the leaching solution is separated from the slag;

[0090] The sodium hypochlorite is added in a ratio of 0.35:1 by the mass ratio of chlorine element to waste fluorescent powder;

[0091] 3) Phosphate precipitation step: According to the molar ratio of phosphate and rare earth elements of 1.6:1, potassium phosphate is added to the above leaching solution, the reaction temperature is controlled at 80°C, the pH value is co...

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Abstract

The invention discloses a method for extracting europium oxide and yttrium oxide from waste fluorescent powder, which mainly comprises the following seven steps: sodium carbonate roasting, chlorination leaching, phosphate precipitation, precipitation conversion, yttrium extraction separation, high-purity yttrium oxide extraction and high-purity europium oxide extraction, wherein the yttrium extraction separation is performed through a P507 extraction separation method to realize simplified efficient continuous separation of rare earth yttrium and europium, and the method is high in separation efficiency and low in cost. Compared with the prior art, the method has the advantages of short process flow, high rare earth element extraction rate, high rare earth product purity, low extraction cost and the like.

Description

technical field [0001] The invention relates to a method for extracting rare earth elements, in particular to a method for extracting europium oxide and yttrium oxide from waste fluorescent powder, and belongs to the field of recycling of waste resources. Background technique [0002] During the cutting process of a cathode ray tube (CRT) of a TV set, there is a large amount of phosphor powder on the screen glass, which contains rare earth metals such as europium (Eu), yttrium (Y), and erbium (Er). If not handled properly, pollutants such as metal complexes in CRT phosphors and lead-containing glass mixed in phosphors enter the soil, air and rivers, causing serious problems. [0003] Therefore, in consideration of environmental management and resource utilization, it is necessary to properly recycle the fluorescent powder in the CRT. [0004] The recycling of electronic waste has attracted more and more attention. Nearly one million tons of electronic waste is generated eve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00
CPCY02P10/20
Inventor 刘伟韬李红儒谭旭燕邱磊
Owner SHANDONG UNIV OF SCI & TECH
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