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Method for recovering valuable metal element in waste phosphor by using phosphonium ionic liquid

A technology of ionic liquids and metal elements, which is applied in the field of green environmental protection and comprehensive resource utilization, can solve the problems of energy resource conservation and ecological environment protection, high acid consumption, and large energy consumption in the process, so as to improve the value of comprehensive utilization, The effect of low acid consumption

Inactive Publication Date: 2014-07-16
NANTONG UNIVERSITY
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Some scholars have also proposed to use combined pyrometallurgy and hydrometallurgy to recover rare earth metals in fluorescent lamps. This method is cumbersome and consumes too much energy in the process, causing secondary pollution to the environment.
Chinese patent (Ni Haiyong, a method for recovering rare earth elements in waste fluorescent lamps, CN200810029417.5) reported that the traditional acidic phosphine extractant P204 or P507 was used to recover rare earth elements in fluorescent lamps, but this method produced ammonia nitrogen wastewater pollution, and the stripping process Medium acid consumption is high, which does not meet the new policy requirements of energy resource conservation and ecological environment protection

Method used

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  • Method for recovering valuable metal element in waste phosphor by using phosphonium ionic liquid
  • Method for recovering valuable metal element in waste phosphor by using phosphonium ionic liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0022] The original fluorescent powder was purchased from Xiamen Tongshida Company, and the components and contents of the fluorescent powder were measured by X-ray fluorescence spectroscopic analysis. The results are shown in Table 1.

[0023] Table 1 The main composition and content of rare earth three primary color phosphors

[0024]

Embodiment 2

[0026] Take 2g of the fluorescent powder obtained in Example 1 and 2g of NaOH solid into a nickel crucible, heat at 320°C for 2 hours, take out and cool to obtain a fluffy white powdery solid alkali melt, add 100ml of water and white powder to dissolve immediately, filter, Washing, after dissolving the obtained insolubles with nitric acid, the solution was left to stand for 0.5 hours and then filtered to obtain the original feed liquid, and the content of main metal ions such as rare earth ions and aluminum ions in the feed liquid was detected by atomic absorption spectroscopy to obtain rare earth ion The leaching rate of aluminum ions is 89.49%, while the leaching rate of aluminum ions is 28.80%.

Embodiment 3

[0028] Take 2g of the fluorescent powder obtained in Example 1 and 5g of NaOH solid into a nickel crucible, heat at 350°C for 4 hours, take out and cool to obtain a white solid block, add 100ml of water to dissolve the solid slowly, and accelerate the dissolution by ultrasonic. The solution is filtered, washed, and the obtained insolubles are dissolved with nitric acid, left to stand for 1 hour and filtered to obtain the original feed liquid, and the content of main metal ions such as rare earth ions and aluminum ions in the feed liquid is detected by atomic absorption spectrometry to obtain rare earth The leaching rate of ions was 65.03%, while that of aluminum ions was 37.94%.

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Abstract

The invention relates to a method for recovering a valuable metal element in waste phosphor by using phosphonium ionic liquid. The method comprises the following steps: collecting phosphor in a waste fluorescent lamp and taking as an initial raw material, using a strong alkaline compound for high temperature roasting to prepare an alkali fusion object, directly using nitric acid for leaching to obtain an insoluble substance leached by water and an acidic material liquid, wherein acidity of the material liquid is 0.1-3.0mol / L, a difunctional ionic liquid extractant [P6,6,6,14][P204] or [P6,6,6,14][P507] as an extractant, isooctyl alcohol is taken as an additive, a diluent selects n-heptane or kerosene, under condition of weak acid, using coexisted mass aluminium nitrate salt as a salting-out agent, extracting and recovering the rare earth element in a phosphor leachate, and then acquiring an organic extract loaded with rare earth ions and a raffinate aqueous solution with rich aluminium nitrate salt. According to the invention, valuable metals in the waste fluorescent lamp can be recovered and used, the process flow is simple, and the method has the advantages of and friendly environment.

Description

technical field [0001] The invention relates to a method for environmental protection and comprehensive utilization of resources, in particular to a method for recovering valuable metal elements in waste fluorescent powder by utilizing quaternary phosphine ionic liquids. Background technique [0002] Rare earth is closely related to high-tech fields such as optoelectronics, information, energy, and national security. The products have high added value, especially the wide application of rare earth magnetic materials, luminescent materials, and catalytic materials. National defense and social development provide important support. Therefore, rare earths, as non-renewable important strategic resources, have received extensive attention and attention. In the "Several Opinions on Promoting the Sustainable and Healthy Development of the Rare Earth Industry" issued by the State Council, it is proposed to promote the coordinated development of rare earth utilization and the enviro...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B26/20C22B59/00
CPCY02P10/20
Inventor 杨华玲江国庆商艳芳金瑞娣朱西挺
Owner NANTONG UNIVERSITY
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