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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  • Application Information

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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 te

Method used

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

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Example Embodiment

[0033] Example 1

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

[0035] 1) Take 4 15W waste rare earth fluorescent lamps, each weighing about 60g, including 23g glass and 10mg mercury per lamp. Separate the mercury-containing phosphor from the waste rare-earth fluorescent lamp from the glass tube by cutting-end purging technology, and add 20% acetone solution with a mass percentage concentration to the separated mercury-containing phosphor. The liquid-solid ratio of acetone to mercury-containing phosphor is 4:1, ultrasonic for 0.5 hour at an ultrasonic frequency of 30kHz to obtain 600ml of 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] 2) Take the abov...

Example Embodiment

[0044] Example 2

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

[0046] 1) Take 4 15W waste rare earth fluorescent lamps, each weighing about 60g, including 23g glass and 10mg mercury per lamp. Separate the mercury-containing phosphor from the waste rare-earth fluorescent lamp from the glass tube by cutting-end purging technology, add 10% by mass acetone solution to the separated mercury-containing phosphor, and the liquid-to-solid ratio of the acetone solution to the mercury-containing phosphor The ratio is 3:1 and the ultrasonic frequency is 20kHz for 0.5 hours to obtain 450ml of mercury-containing waste liquid. The mercury content in the mercury-containing waste liquid is 75.55mg / L, and the calculated mercury content is 34mg. The calculated mercury removal rate after ultrasonic ...

Example Embodiment

[0055] Example 3

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

[0057] 1) Take 4 15W waste rare earth fluorescent lamps, each weighing about 60g, including 23g glass and 10mg mercury per lamp. Separate the mercury-containing phosphor from the waste rare-earth fluorescent lamp from the glass tube by cutting-end purge technology, add acetone solution with a concentration of 40% by mass to the separated mercury-containing phosphor, and the liquid-to-solid ratio of the acetone solution to the mercury-containing phosphor The ratio is 5:1, the ultrasonic frequency is 40kHz for 1 hour to obtain 750ml 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...

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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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