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Method for removing silicon in lutetium yttrium silicate lixivium

A technology of yttrium lutetium silicate and leaching solution is applied in the field of rare earth recovery, which can solve the problems of ineffective removal and high silicon impurity content, and achieve the effects of shortening washing time, high rare earth yield and good economic benefits

Pending Publication Date: 2022-04-12
CHALCO GUANGXI RARE EARTH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned deficiencies, the present invention discloses a method for removing silicon in yttrium-lutetium silicate leaching solution, which solves the problem that the silicon impurity content in yttrium-lutetium silicate leaching solution is high and cannot be effectively removed

Method used

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  • Method for removing silicon in lutetium yttrium silicate lixivium

Examples

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Embodiment 1

[0023] A method for removing silicon in yttrium lutetium silicate leaching solution, comprising the following steps:

[0024] (1) Take yttrium lutetium silicate waste and mix evenly with caustic soda to obtain mixture A, the mass ratio of yttrium lutetium silicate waste to caustic soda is 1:1.5, roast mixture A at 600°C for 6h, and then Mixture A was cooled to 70°C and placed in a reaction vessel, then 450mL of hot water was added to 100g of mixture A for mixing, then stirred and reacted at 105°C for 3.5h, and then filtered to obtain a rare earth hydroxide precipitate;

[0025] (2) Wash the rare earth hydroxide precipitate obtained in step (1) twice with sodium hydroxide solution; during each wash, the mass ratio of the rare earth hydroxide precipitate to the sodium hydroxide solution is 1g:32mL, and the hydroxide The sodium solution is mixed with the rare earth hydroxide precipitate and stirred at 45°C for 15 minutes at a stirring speed of 200r / min, then left to clarify, and ...

Embodiment 2

[0030] A method for removing silicon in yttrium lutetium silicate leaching solution, comprising the following steps:

[0031](1) Take yttrium lutetium silicate waste and mix evenly with caustic soda to obtain mixture A, the mass ratio of yttrium lutetium silicate waste to caustic soda is 1:1.5, roast mixture A at 600°C for 6h, and then Mixture A was cooled to 60°C and placed in a reaction vessel, then 400mL of hot water was added to 100g of mixture A for mixing, then stirred and reacted at 100°C for 3h, and then filtered to obtain rare earth hydroxide precipitates;

[0032] (2) Wash the rare earth hydroxide precipitate obtained in step (1) twice with sodium hydroxide solution; during each wash, the mass ratio of the rare earth hydroxide precipitate to the sodium hydroxide solution is 1g:30mL, and the hydroxide The sodium solution is mixed with the rare earth hydroxide precipitate and stirred at 40°C for 10 minutes at a stirring speed of 100 r / min, then left to clarify, and the...

Embodiment 3

[0037] A method for removing silicon in yttrium lutetium silicate leaching solution, comprising the following steps:

[0038] (1) Take yttrium lutetium silicate waste and mix evenly with caustic soda to obtain mixture A, the mass ratio of yttrium lutetium silicate waste to caustic soda is 1:1.5, roast mixture A at 600°C for 6h, and then Mixture A was cooled to 75°C and placed in a reaction vessel, then 480mL of hot water was added to each 100g of mixture A for mixing, then stirred and reacted at 105°C for 3.5h, and then filtered to obtain a rare earth hydroxide precipitate;

[0039] (2) Wash the rare earth hydroxide precipitate obtained in step (1) with sodium hydroxide solution for 3 times; during each washing, the mass ratio of the rare earth hydroxide precipitate to the sodium hydroxide solution is 1g:33mL, and the hydroxide The sodium solution is mixed with the rare earth hydroxide precipitate and stirred at 48°C for 12 minutes at a stirring speed of 200r / min, then left to...

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Abstract

The invention discloses a method for removing silicon in a lutetium yttrium silicate leachate, which comprises the following steps: uniformly mixing lutetium yttrium silicate waste with caustic soda flakes, roasting, adding hot water, stirring for reaction, and filtering to obtain a rare earth hydroxide precipitate; washing the obtained rare earth hydroxide precipitate for 2-3 times by using a sodium hydroxide solution; placing the treated rare earth hydroxide precipitate in a reaction container, adding a small amount of pure water, stirring, heating to 70-90 DEG C under a water bath condition, keeping the temperature constant, slowly adding hydrochloric acid to dissolve the rare earth hydroxide precipitate to obtain a mixed solution, and filtering to remove silicic acid colloid to obtain a rare earth leaching solution; and extracting the rare earth leachate by using an extracting agent prepared from N235, isooctyl alcohol and kerosene to remove impurity iron, then heating and concentrating to separate out sodium chloride in the solution, and filtering to remove the separated sodium chloride to obtain pure lutetium yttrium chloride feed liquid. The method can effectively solve the problems that the content of silicon impurities in the lutetium yttrium silicate leachate is high and the silicon impurities cannot be effectively removed.

Description

technical field [0001] The invention belongs to the technical field of rare earth recovery, in particular to a method for removing silicon in yttrium-lutetium silicate leaching solution. Background technique [0002] Yttrium lutetium silicate is the most advanced, high-performance scintillation crystal for large-scale nuclear medicine equipment and other high-end equipment in the world today, and is an important raw material for various radioactive detection, medical equipment, aviation equipment and other fields. For example, yttrium lutetium silicate scintillation crystal (LYSO) is considered to be the inorganic scintillation crystal material with the best comprehensive performance, and it is an ideal scintillation crystal for SPECT and PET to replace NaI(Tl) and BGO in the future. However, at least 20% of cutting scraps are produced during the production or application of yttrium lutetium silicate crystals. In order to realize the efficient comprehensive utilization of ra...

Claims

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Application Information

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IPC IPC(8): C22B59/00C22B7/00C22B1/02C22B3/40
CPCY02P10/20
Inventor 潘务霞莫国荣张亮玖蓝灵江周慧荣雷利利黄新将欧小萍何琦俞志春李宽
Owner CHALCO GUANGXI RARE EARTH DEV CO LTD
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