Supercharge Your Innovation With Domain-Expert AI Agents!

Method for recovering rare earth elements from waste red phosphor

A red phosphor, rare earth element technology, applied in rare earth metal compounds, chemical instruments and methods, inorganic chemistry, etc., can solve problems such as rare earth recycling not involved

Active Publication Date: 2012-10-24
JIANGXI HUAKE RARE EARTH NEW MATERIALS
View PDF3 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The law also does not involve the recovery of rare earths in color TV red phosphors and other red phosphors

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for recovering rare earth elements from waste red phosphor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Take 1000g of discarded red phosphors for three primary color fluorescent lamps, total rare earth (TREO): 81.56%, Eu 2 O 3 / TREO: 7.25%, Y 2 O 3 / TREO: 92.73%, other rare earth 2 O 2 )(3%)-glacial acetic acid (CH 3 COOH) (8%), amount of rare earth metal: volume of composite acid = 1:3, acid dissolution conditions are: acidity 0.5N, acid dissolution temperature 90℃, after acid dissolution, filter to remove insolubles to obtain 2.4L concentration of 338.1g / l The rare earth chloride solution, the calculated yield of rare earth dissolution is 99.5%. Dilute the rare earth chloride solution to a concentration of 120±5g / l and adjust the pH to 2.5±0.3, and enter the fractionation extraction system of 22% naphthenic acid + 18% mixed alcohol + 60% sulfonated kerosene in the organic phase saponified with NaOH After extraction and separation, after 75-stage extraction and 15-stage washing, high-purity yttrium chloride (YCl 3 ) Solution, the solution is precipitated and filtered with ...

Embodiment 2

[0019] Take 1000g of discarded red phosphors for tri-color fluorescent lamps, total rare earth (TREO): 81.56%, EU 2 O 3 / TREO: 7.25%, Y 2 O 3 / TREO: 92.73%, other rare earth 2 O 2 )(5%)-glacial acetic acid (CH 3 COOH) (3%), amount of rare earth metal: volume of composite acid = 1:3, acid dissolution conditions: acidity 0.5N, acid dissolution temperature 110°C, after acid dissolution, filter to remove insoluble matter to obtain 2.41L with a concentration of 337.0g / l The rare earth chloride solution, the calculated yield of rare earth dissolution is 99.6%. The subsequent process steps are the same as in Example 1.

Embodiment 3

[0021] Take 1000g of discarded red phosphors for three primary color fluorescent lamps, total rare earth (TREO): 81.56%, Eu 2 O 3 / TREO: 7.25%, Y 2 O 3 / TREO: 92.73%, other rare earth 3 )(89%)-oxidant(H 2 O 2 )(3%)-glacial acetic acid (CH 3 COOH) (8%), amount of rare earth metal: volume of composite acid = 1:3, acid dissolution conditions are: acidity 0.5N, acid dissolution temperature 90℃, after acid dissolution, filter to remove insolubles to obtain 2.41L concentration of 337.0g / l The calculated rare earth nitrate solution yield is 99.6%. Dilute the rare earth nitrate solution to a concentration of 120±5g / l and adjust the pH to 2.5±0.3, and enter it into a fractional extraction system of 22% naphthenic acid + 18% mixed alcohol + 60% sulfonated kerosene in the organic phase saponified with NaOH Extraction and separation, after 75-stage extraction and 15-stage washing, high-purity yttrium nitrate (Y(NO 3 ) 3 ) Solution, the solution is precipitated and filtered with high-quality...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a method for recovering rare earth elements from waste red phosphor. The method is characterized by: carrying out a calcination pretreatment on collected waste red phosphor in a calcination furnace kiln, and removing organic substances and other elements easily forming volatile gases in the red phosphor; carrying out dissolution decomposition on the calcined red phosphor in an acid (HCl, HNO3)-oxidant (H2O2)-stabilizing additive (acetic acid) composite acid system, and controlling to obtain a low acidity, such that rare earth elements such as Y and Eu or other rare earth in the red phosphor are preferentially dissolved, and completely enter the solution, and the other elements are insoluble substances, and are removed by filtration; after obtaining a rare earth acid solution, adopting an ammonia-free saponified fractionation extraction system to carry out extraction separation to obtain a high purity single rare earth chloride such as YCl3 and EuCl3 or other chlorinated rare earth enriched product solutions; and carrying out processes of precipitation and ignition to obtain a single rare earth oxide such as Y2O3 and Eu2O3 or other rare earth enriched product oxide products.

Description

Technical field [0001] The invention relates to a method for comprehensive recovery and utilization of three wastes, in particular to a method for recovering rare earth elements in waste red phosphor. Background technique [0002] According to statistics, the output of rare earth phosphors in my country in 2010 reached 9,398 physical tons, an increase of 29.9% over the previous year. Among them, 8,000 tons of three-primary color phosphors for lamps (increased by 33.3% over the previous year), 500 tons of color TV phosphors, 450 tons of long afterglow phosphors, and about 448 tons of other phosphors. It is estimated that by 2012, my country's rare earth phosphor production will reach 14,000 tons, which will consume 6,500 tons of various rare earths. In the production of phosphors, the production and use of tri-primary fluorescent lamps, and the production and use of color TVs, a huge amount of phosphor waste is generated. It is estimated that by 2012, the waste of rare earth phos...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C01F17/00
Inventor 廖爱阳
Owner JIANGXI HUAKE RARE EARTH NEW MATERIALS
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com