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Comprehensive recycling treatment method of waste rare-earth fluorescent lamp

A technology for recycling and processing fluorescent lamps, applied in the direction of improving process efficiency, etc., can solve the problems of comprehensive recycling and processing of waste rare earth fluorescent lamps, etc., and achieve the effect of low recycling cost and short process flow

Active Publication Date: 2014-03-12
HUNAN RARE EARTH METAL MATERIAL RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to provide a comprehensive recovery treatment method for waste rare earth fluorescent lamps, which solves the technical problem in the prior art that the valuable elements in waste rare earth fluorescent lamps cannot be comprehensively recovered and processed

Method used

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  • Comprehensive recycling treatment method of waste rare-earth fluorescent lamp

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The following steps are adopted to comprehensively recover valuable elements rare earth, aluminum, strontium and mercury from waste rare earth fluorescent lamps.

[0035] 1) Take four 15W waste rare earth fluorescent lamps, each weighing about 60g, containing 23g of glass, and 10mg of mercury per lamp. The mercury-containing phosphor in the waste rare earth fluorescent lamp is separated from the glass tube by using the incisal purge technology, and an acetone solution with a mass percentage concentration of 20% is added to the separated mercury-containing phosphor. The liquid-solid ratio of acetone to the mercury-containing phosphor is: 4:1, sonicate for 0.5 hour at an ultrasonic frequency of 30kHz to obtain 600ml mercury-containing waste liquid. After testing, the mercury content in the mercury-containing waste liquid is 61.66mg / L, and the calculated mercury content is 37mg. The calculated mercury removal rate after ultrasonic separation is as high as 92.50%.

[0036]...

Embodiment 2

[0045] The waste rare earth fluorescent lamp used in the experiment is the same as that in Example 1, and the valuable elements rare earth, aluminum, strontium and mercury are comprehensively recovered from it according to the following steps.

[0046]1) Take four 15W waste rare earth fluorescent lamps, each weighing about 60g, containing 23g of glass, and 10mg of mercury per lamp. Use cut-end purge technology to separate mercury-containing phosphors from waste rare earth fluorescent lamps from glass tubes, add acetone solution with a mass percentage concentration of 10% to the separated mercury-containing phosphors, and the liquid-solid ratio of acetone solution to mercury-containing phosphors The ratio is 3:1, sonicate for 0.5 hour at an ultrasonic frequency of 20kHz to obtain 450ml of mercury-containing waste liquid. The mercury content in the mercury-containing waste liquid is 75.55 mg / L, and the calculated mercury content is 34 mg. The calculated mercury removal rate afte...

Embodiment 3

[0056] The waste rare earth fluorescent lamp used in the experiment is the same as that in Example 1, and the valuable elements rare earth, aluminum, strontium and mercury are comprehensively recovered from it according to the following steps.

[0057] 1) Take four 15W waste rare earth fluorescent lamps, each weighing about 60g, containing 23g of glass, and 10mg of mercury per lamp. Use cut-end purge technology to separate mercury-containing phosphors from waste rare earth fluorescent lamps from glass tubes, add acetone solution with a mass percentage concentration of 40% to the separated mercury-containing phosphors, and the liquid-solid ratio of acetone solution to mercury-containing phosphors The ratio is 5:1, and the ultrasonic frequency is 40kHz for 1 hour to obtain 750ml of mercury-containing waste liquid. The mercury content in the mercury-containing waste liquid is 52.00 mg / L, and the calculated mercury content is 39 mg. The calculated mercury removal rate after ultras...

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Abstract

The invention discloses a comprehensive recycling treatment method of a waste rare-earth fluorescent lamp, which comprises the steps that S1, waste fluorescent powder, a waste glass tube and mercury-containing waste liquid are separated and recycled from the waste rare-earth fluorescent lamp; S2, the waste fluorescent powder is roasted; an obtained roasted ore is leached; a leaching solution and a leaching residue are obtained; S3, the leaching solution is subjected to extraction, reverse extraction and separation; alumina and rare-earth oxide are obtained; and S4, the leaching residue is subjected to digestion, extraction and purification; and a strontium-containing product is obtained. The waste rare-earth fluorescent lamp is separated, the obtained waste fluorescent powder and the obtained mercury-containing waste liquid are comprehensively recycled respectively by technologies of roasting, leaching, extraction, reverse extraction and the like, and then secondary valuable resources such as alumina, various rare-earth oxide and the strontium-containing product are comprehensively recycled from the waste fluorescent powder. The method is short in technological process and low in recycling cost, solves the problems of stockpiling, environmental pollution and the like caused by the industrial waste rare-earth fluorescent lamp, and has certain economic benefits and industrial significance.

Description

technical field [0001] The invention relates to the technical field of waste recycling, in particular to a method for comprehensive recycling and treatment of waste rare earth fluorescent lamps. Background technique [0002] As one of the rare earth functional materials, phosphors are widely used in plasma TVs, semiconductor lighting, light emitting diodes and rare earth fluorescent lamps due to their advantages such as high luminous brightness and luminous efficiency, good color purity and chemical stability, and long life. . With the continuous development of the rare earth fluorescent lamp industry, the output of phosphor powder continues to increase, and the application fields continue to expand. The stockpiling of waste rare earth fluorescent lamps and waste phosphor powder, and environmental protection problems also follow. [0003] The valuable elements contained in waste rare earth fluorescent lamps are mainly rare earth elements yttrium (Y), europium (Eu), terbium ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B59/00C22B21/00
CPCY02P10/20
Inventor 刘吉波王志坚杨涛吴文花苏正夫
Owner HUNAN RARE EARTH METAL MATERIAL RES INST
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