Green method for recovering rare earth from waste fluorescent powder and application of green method

A fluorescent powder and rare earth technology, which is applied in the field of rare earth recovery from waste fluorescent powder, can solve the problems affecting rare earth extraction, rare earth recovery rate and purity guarantee, etc., to achieve improved leaching rate, good physical phenomena, and no acid and alkali consumption Effect

Inactive Publication Date: 2017-10-27
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fe, Al, and Si will be extracted preferentially, which will affect the extraction of rare earths, and the recovery rate and purity of rare earths are difficult to guarantee

Method used

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  • Green method for recovering rare earth from waste fluorescent powder and application of green method

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Experimental program
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Effect test

Embodiment 1

[0049] A green method for recovering rare earths from waste fluorescent powder, the steps are as follows:

[0050] 1) Mix waste fluorescent powder consisting of 40wt% red powder, 25wt% blue powder, and 35wt% green powder with sodium hydroxide at a mass ratio of 1:0.3, and melt at 500°C for 3 hours to obtain an alkali melt;

[0051] 2) According to the mass ratio of 1:10, add water to the alkali melt obtained in step 1) and carry out water immersion at 80°C, and separate to obtain the water insoluble matter and water immersion liquid, according to the mass of the water insoluble matter and 2mol / L nitric acid The ratio is 1:10, adding acid to the water insoluble matter for acid leaching, and separating to obtain the acid leaching insoluble matter and acid leaching solution;

[0052] 3) Extracting the rare earth ions in the pickling solution with an extractant, the volume ratio of the extractant to the pickling solution is 1:20, the ionic strength of the water phase is 0.5mol / L, ...

Embodiment 2

[0056] A green method for recovering rare earths from waste fluorescent powder, the steps are as follows:

[0057] 1) Mix waste fluorescent powder consisting of 40wt% red powder, 25wt% blue powder, and 35wt% green powder with sodium carbonate at a mass ratio of 1:1, and melt at 900°C for 0.5h to obtain an alkali melt;

[0058] 2) According to the mass ratio of 10:1, add water to the alkali melt obtained in step 1) and carry out water immersion at 20°C, and separate to obtain the water insoluble matter and water immersion liquid, according to the mass of the water insoluble matter and 8mol / L nitric acid The ratio is 10:1, adding acid to the water insoluble matter to carry out acid leaching and separation to obtain the acid leaching insoluble matter and acid immersion liquid;

[0059] 3) Add salting-out agent sodium nitrate to the acid dipping solution to make its concentration in the feed liquid 5mol / L, and extract the rare earth ions in the pickling solution with an extractant...

Embodiment 3

[0063] A green method for recovering rare earths from waste fluorescent powder, the steps are as follows:

[0064] 1) Mix waste fluorescent powder consisting of 40wt% red powder, 25wt% blue powder, and 35wt% green powder with sodium peroxide at a mass ratio of 1:0.8, and melt at 700°C for 2 hours to obtain an alkali melt;

[0065] 2) According to the mass ratio of 1:5, add water to the alkali melt obtained in step 1) and carry out water immersion at 50°C, and separate to obtain the water insoluble matter and water immersion liquid. According to the ratio of water insoluble matter and 3mol / L nitric acid The mass ratio is 1:5, adding acid to the water-leaching insolubles for acid leaching, and separating to obtain the acid-leaching insolubles and pickling liquid;

[0066] 3) adding salting-out agent sodium nitrate to the acid dipping solution to make its concentration in the feed solution 1mol / L, and extracting the rare earth ions in the pickling solution with an extractant, the...

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Abstract

The invention relates to a green method for recovering rare earth from waste fluorescent powder and application of the green method. The green method comprises the following steps: (1) mixing the waste fluorescent powder and alkali and melting to obtain an alkali melt; (2) adding water into the alkali melt obtained in the step (1) for water leaching and separation, obtaining a water-leaching insoluble matter and a water leaching liquid and adding acid into the water-leaching insoluble matter for acid leaching and separation to obtain an acid-leaching insoluble matter and an acid leaching liquid; (3) extracting rare earth ions in the acid leaching liquid by using an extracting agent to obtain raffinate and extracting liquid loaded with the rare earth ions, wherein the extracting agent comprises: (A) quaternary phosphonium ionic liquid and / or quaternary ammonium ionic liquid; (B) neutral organic phosphonate; the ionic liquid is taken as the extracting agent; (4) performing reverse extraction on the extracting liquid obtained in the step (3) with water to obtain an ionic liquid phase and a water phase containing the rare earth ions. The final rare earth recovery rate reaches 90 percent by weight or above, the extracting process is not required to be saponified, no acid or alkali consumption is generated, no ammonia-nitrogen wastewater is generated, and the completely-reverse extraction can be realized with the water.

Description

technical field [0001] The invention relates to the technical field of rare earth recovery, in particular to a green method for recovering rare earth from waste fluorescent powder and its application. Background technique [0002] Phosphor powder contained in discarded old fluorescent lamps is one of the important secondary resources of rare earths. According to the content of rare earths, the amount of rare earths in phosphors represents more than 32% of the market share of rare earths. Recycling the rare earths in it can not only alleviate the problem of environmental pollution, but also has objective economic benefits. In addition, it also helps to solve the balance problem of key rare earth elements. Rare earth elements are often associated with each other, and the content of light rare earths in minerals is larger than that of heavy rare earths. If a large amount of rare earth elements are produced in order to meet the use of a certain rare earth element, it will inev...

Claims

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Application Information

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IPC IPC(8): C22B59/00C22B7/00
CPCC22B7/006C22B59/00Y02P10/20
Inventor 赵君梅刘会洲
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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