Preparation method for recovering high-purity yttrium europium from fluorescent powder scrap

A fluorescent powder, high-purity technology, applied in the field of recovering high-purity yttrium-europium, can solve problems such as large consumption of raw materials and low recovery rate, and achieve the effects of strong competitiveness, high-efficiency separation, and guaranteed purity and yield.

Inactive Publication Date: 2011-03-16
赣州市永莱宝高新材料有限公司
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Problems solved by technology

[0003] At present, the production process of recovering yttrium and europium from phosphor waste is dissolved in sulfuric acid, and H2O2 oxidizes Eu2+ into Eu3+. This process has a low recovery rate and consumes a lot of raw materials.

Method used

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Embodiment Construction

[0020] In order to make the technical means, creative features, work flow, and use methods of the present invention achieve the purpose and effect easily understood, the present invention will be further described below in conjunction with specific embodiments.

[0021] Take 500g of fluorescent powder and put it into an enamel reaction pot, add 1L of water to heat up to 75°C, and mechanically stir at the same time, then slowly add concentrated HCL (ρ≥1.15) to control the final acidity pH value of 0.5~1, so that it can be completely dissolved; The feed liquid is filtered through the plate and frame, adjusted to PH=2 by ammonia water, mechanically stirred by adding an appropriate amount of ammonium sulfate, and then added a certain amount of zinc powder. Crude europium is produced by HCL filtration; yttrium-rich and zinc-enriched material liquid is passed through N235 to remove zinc and iron, and the zinc liquid is recovered by ammonium bicarbonate precipitation; part of the mate...

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Abstract

The invention discloses a preparation method for recovering high-purity yttrium europium from fluorescent powder scrap, comprising the following steps: 1) dissolving fluorescent powder; 2) carrying out filter pressing on dissolved feed liquid to obtain rough europium by a plate frame; 3) removing zinc and iron from feed liquid rich with yttrium and zinc by N235; 4) putting YCL3 into HB extracting agent for secondary edulcoration to obtain fluorescent-grade 4N-5N YCL3, dewatering, carbonizing and oxidizing; 5) putting prepared rough EU and HA-extracted rough EU into a reaction vessel, and slowly adding zinc power in batches; 6) after reducing, adjusting pH value by ammonium chloride and ammonia water in place to prepare europium hydroxide; 7) preparing a europium hydroxide solution with certain concentration and pH value, transmitting to an HB agent system for reaction; 8) firing after washing; and 9) dewatering, carbonizing and oxidizing for 3-5 hours at the high temperature of about 1000 DEG C to obtain fluorescent-grade europium oxide, smashing, screening and packaging in vacuum. The invention has the advantages of reasonable technology, strong maneuverability and strong competitiveness.

Description

technical field [0001] The invention belongs to the field of resource extraction, in particular to a preparation method for recovering high-purity yttrium and europium from fluorescent powder waste. Background technique [0002] In the traditional naphthenic acid separation process, because the low-yttrium mixed rare earths after yttrium extraction contain 15-20% yttrium, and yttrium in the subsequent P 507 The sequence in the extraction is between Dy, Ho and Er, Tm, which increases the difficulty of the subsequent heavy rare earth separation process such as the separation and purification of terbium and dysprosium, and affects the high purification of the product. [0003] The current production process for recovering yttrium and europium from phosphor waste is dissolved in sulfuric acid, and H2O2 oxidizes Eu2+ into Eu3+. This process has a low recovery rate and consumes a lot of raw materials. [0004] The invention uses HCl as a dissolving agent, and improves the recover...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/10C22B3/20C22B59/00
CPCY02P10/20
Inventor 杨剑曹建明
Owner 赣州市永莱宝高新材料有限公司
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