Method for recycling rare earth in cerium-doped lutetium yttrium oyorthosilicate waste material

A yttrium lutetium silicate and cerium doping technology is applied in the field of comprehensive resource recovery and utilization, and can solve the problems of cumbersome operation, large water consumption and the like

Active Publication Date: 2019-10-08
INST OF APPLIED CHEM JIANGXI ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, CN104928475A discloses a recovery method of rare earth-containing aluminum-silicon waste. First, the waste is washed and heat-treated with a surfactant to reduce the interference of subsequent separation of aluminum on the recovery rate of rare earth. Then, an inorganic strong acid is added to react to control the reaction process. pH value in the medium, after adding sodium hydroxide aqueous solution, filter, then dissolve with acid, and finally recover rare earth through solvent extraction; this method is cumbersome to operate and consumes a lot of water

Method used

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  • Method for recycling rare earth in cerium-doped lutetium yttrium oyorthosilicate waste material
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  • Method for recycling rare earth in cerium-doped lutetium yttrium oyorthosilicate waste material

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Effect test

Embodiment 1

[0052] The cerium-doped yttrium lutetium silicate waste obtained by grinding and sieving was mixed with NaOH at a mass ratio of 1:1, subjected to alkali fusion at 600°C for 4 hours, washed with water until neutral, and then filtered to obtain the enriched material, of which The particle size of cerium-doped yttrium-lutetium silicate waste is 200 mesh;

[0053] Mix the enriched material and the hydrochloric acid solution with a concentration of 2.5mol / L according to the solid-to-liquid ratio of 7g:1mL, stir the acid solution at 50°C for 0.5h, filter out the impurities insoluble in the acid, and obtain the pickling solution ;

[0054] Using inductively coupled plasma-mass spectrometry to detect the content of rare earth ions and other impurity ions in the acid leaching solution, the leaching rate of rare earth ions in the obtained acid leaching solution is 95.86%. Among them, the working parameters of inductively coupled plasma-mass spectrometry : The carrier liquid flow rate i...

Embodiment 2～12

[0059] Reclaim cerium-doped yttrium lutetium silicate waste material according to the method of embodiment 1, the leaching rate of rare earth metal example in the experimental condition of embodiment 1~12 and the pickling solution of measurement is as shown in table 1, the other of embodiment 1~12 The experimental conditions are the same as in Example 1.

[0060] Experimental conditions and leaching rate of table 1 embodiment 1~12

[0061]

[0062]

[0063] It can be seen from Table 1 that the alkali melting temperature has the greatest impact on the leaching rate of rare earths. This is because as the alkali melting temperature increases, the lattice of yttrium lutetium silicate is distorted, and the crystal structure begins to collapse and become unstable overall, resulting in replacement of rare earth ions and OH in the environment - and CO 2 Rare earth oxides are formed, which are more easily leached by dilute acids.

Embodiment 13

[0070] Recycling cerium-doped yttrium-lutetium silicate waste according to the method in Example 1, the difference from Example 1 is that the ether amide functional ionic liquid is two (2-ethylhexyl)-3-oxo with hexafluorophosphate as an anion Glutaramide functional ionic liquid, the recovery rate of the finally obtained rare earth is 79.18%.

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Abstract

The invention provides a method for recycling rare earth in cerium-doped lutetium yttrium oyorthosilicate waste material, and belongs to the technical field of comprehensive recycle and utilization ofrare-earth resources. The method for recycling the rare earth in the cerium-doped lutetium yttrium oyorthosilicate waste material comprises the following steps that the cerium-doped yttrium lutetiumoyorthosilicate waste material and an inorganic alkali reagent are mixed, and alkali fusion is carried out to obtain enriched material; the enriched material and an acid solution are mixed, and acid dissolution is carried out to obtain an acid leaching solution; the acid leaching solution is extracted by adopting an extracting agent solution to obtain a rare earth extracting solution; reverse extracting is carried out on the rare earth extracting solution to obtain and recycle rare earth material, wherein the extracting agent solution comprises an ether amide functional ionic liquid and a mixed solution of an additive and a diluent. According to the method, the structure of the cerium-doped lutetium yttrium oyorthosilicate waste material is destroyed in the alkali fusion process, the acidconsumption in the acid dissolution process is reduced, by adding the ether amide functional ionic liquid, the extraction performance of the rare earth is improved, the operation is simple and convenient, the cost is low, and the method is suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of comprehensive resource recovery and utilization, in particular to a method for recovering rare earths in cerium-doped yttrium-lutetium silicate waste materials. Background technique [0002] Rare earth is known as the "gold" of industry. Because of its excellent optical, electromagnetic and other physical properties, it can form new materials with different properties and varieties with other materials. It is widely used in military, electronics, petrochemical, metallurgy, machinery, energy, etc. , light industry, environmental protection, agriculture and other fields. Taking lutetium as the representative heavy rare earth as an example, lutetium silicate (LSO) crystal is a new type of scintillator with excellent performance. It has high density, high light output and short decay time. It is widely used in nuclear medical imaging and other fields, especially The emergence of commercial clinical LSO cryst...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B59/00
CPCC22B7/007C22B59/00Y02P10/20
Inventor 崔红敏石劲松晏南富李玲柳跃伟
Owner INST OF APPLIED CHEM JIANGXI ACAD OF SCI
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