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Method for regenerating rare earth trichromatic fluorescent powder for lamp

A fluorescent powder and three primary colors technology, applied in chemical instruments and methods, luminescent materials, recycling technology, etc., can solve the problems of high recycling cost, direct recycling and regeneration of less fluorescent powder, and no recycling and reuse of rare earth phosphors, etc. Achieve low-cost regeneration and good regeneration effect

Active Publication Date: 2011-01-12
JIANGMEN KANHOO IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] CN100577830C discloses a method for reclaiming rare earth elements in waste fluorescent lamps, which is characterized in that it uses a strong base to melt the fluorescent powder, then dissolves the insoluble matter with an acid, and then uses methods such as extraction and co-precipitation to reclaim various valuable metal elements. Involving direct recycling of rare earth phosphors
Does not involve the recovery and reuse of rare earth phosphors for fluorescent lamps
[0008] In addition, Samsung Electronics patent WO2005064637-A1 has carried out fire recovery of mercury in LCD phosphors, and Japanese patents JP2005096821-A and JP2005132551-A have carried out research on crushing equipment for waste fluorescent lamps respectively; JP2004238526-A has carried out research on mercury in waste light sources Phosphor powder is recycled, but it mainly involves the recovery of halophosphate phosphors, etc. Most of the patents mainly focus on the recovery of light sources, and less involve the direct recycling and regeneration of phosphors
[0009] Although the above recycling methods can recycle some resources, but the comprehensive recycling cost is relatively high

Method used

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  • Method for regenerating rare earth trichromatic fluorescent powder for lamp

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] a) Wet 500g of waste fluorescent powder produced in the production process of the lamp factory and pass it through a 250-mesh sieve to remove large particles of impurities, and then magnetically separate to remove magnetic impurities to obtain recycled powder;

[0032] b) Add 100ml of acetic acid solution with a concentration of 1mol / L to the recycled powder, add water to increase the volume of the slurry to 2L, then stir for 20 minutes, then let it stand, and after the slurry is separated, pour out the upper layer of turbid liquid, and then Add 100ml of ethanol with a concentration of 95%, add water to 2L, stir for 20min, let stand, wait for the slurry to separate, pour off the upper layer of turbid liquid, then add water to 2L, heat until the water temperature is above 90°C, After stirring for 20 minutes, let it stand still, and after the slurry is layered, pour out the upper layer of turbid liquid to obtain a recovered slurry with the lower layer cleaned;

[0033] c)...

Embodiment 2

[0037] a) Take 500g of waste fluorescent powder recovered from waste lamps and remove mercury and wet through a 250-mesh sieve to remove large particles of impurities, and then magnetically separate to remove magnetic impurities to obtain recycled powder;

[0038] b) Add 100ml of hydrogen peroxide solution with a concentration of 1mol / L to the recycled powder, add water to increase the volume of the slurry to 2L, then stir for 20 minutes, then let it stand, and after the slurry is separated, pour out the upper turbid liquid, and then Add 100ml of benzene solution with a concentration of 1mg / ml, add water to 2L, stir for 20min, let stand, wait for the slurry to separate, pour off the upper layer of turbid liquid, then add water to 2L, heat until the water temperature is greater than 90 degrees Celsius Above, after stirring for 20 minutes, let it stand still, and after the powder slurry is layered, pour out the upper layer of turbid liquid to obtain a cleaned and recovered powder...

Embodiment 3

[0043] a) Take 500g of waste fluorescent powder recovered from waste lamps and remove mercury and wet through a 250-mesh sieve to remove large particles of impurities, and then magnetically separate to remove magnetic impurities to obtain recycled powder;

[0044] b) Add 100ml of hydrogen peroxide solution with a concentration of 1mol / L to the recycled powder, add water to increase the volume of the slurry to 2L, then stir for 20 minutes, then let it stand, and after the slurry is separated, pour out the upper turbid liquid, and then Add 100ml of benzene solution, add water to 2L, stir for 20min, let stand, wait for the slurry to separate, pour off the upper layer of turbid liquid, then add water to 2L, heat until the water temperature is higher than 90 degrees Celsius, and stir for 20min , stand still, and after the slurry is layered, the upper layer of turbid liquid is poured out to obtain a cleaned and recovered slurry;

[0045] c) Mill the recovered slurry for 60 minutes a...

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Abstract

The invention discloses a method for regenerating rare earth trichromatic fluorescent powder for a lamp. The method comprises the following steps of: cleaning sieved and magnetic impurity-removed reclaimed fluorescent powder with cleaning solution; performing ball-milling on the cleaned fluorescent powder, sieving and drying; reducing dry fluorescent powder under a reducing atmosphere; sieving and calcining the reduced fluorescent powder; and sieving the calcined fluorescent powder to obtain regenerated fluorescent powder. The method realizes the low cost regeneration of fluorescent powder for the lamp. The regenerated fluorescent powder has only 5 to 15 percent of light efficiency difference at a similar color temperature and good regeneration effect and can be directly applied to the manufacturing of the lamp. The reclamation method has low cost, realizes the low cost reutilization of rare earth fluorescent powder and effectively recycles precious rare earth resources.

Description

technical field [0001] The invention relates to a method for recycling fluorescent powder, in particular to a method for regenerating rare earth tricolor fluorescent powder for lamps. Background technique [0002] Compared with incandescent lamps, energy-saving lamps have the advantages of high efficiency and energy saving, and are accepted by consumers, and have gradually become mainstream lighting products. Common energy-saving lamps are low-pressure mercury lamps. The luminescent material used in energy-saving lamps is a rare earth luminescent material. [0003] According to statistics, in 2009, the output of my country's energy-saving lamps alone reached about 3.8 billion, accounting for one-third of the world's output, and the use of rare earth phosphors reached about 6,000 tons, of which about 3,000 tons were rare earth raw materials. Rare earth elements are important non-renewable strategic resources. With the mining and utilization of rare earth resources, the pric...

Claims

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Application Information

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IPC IPC(8): C09K11/01
CPCY02W30/50
Inventor 刘宗淼赖志敏龚敏万国江
Owner JIANGMEN KANHOO IND
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