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Preparation method of large specific surface area hollow spherical neodymium oxide

A large specific surface area, neodymium oxide technology, applied in chemical instruments and methods, rare earth metal oxides/hydroxides, inorganic chemistry, etc., can solve problems such as complex methods

Inactive Publication Date: 2018-12-14
王颖皓
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent (CN201410543212.4) is a method for preparing spherical neodymium disilicate high-temperature ceramic pigments, using ethyl orthosilicate, absolute ethanol, ammonia, citric acid, and polyethylene glycol to prepare spherical neodymium silicate. The method is more complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Take the neodymium chloride obtained by rare earth extraction and separation and place it in a sedimentation tank, add 7 times the weight of 1.5mol / L neodymium chloride salt solution in deionized water, then add 0.08 times of fatty alcohol polyoxyethylene ether, 0.05 times of ring Dextrin, stirred for 11 minutes;

[0020] (2) Add dropwise 3 times 3mol / L sodium bicarbonate to the above mixture at a rate of 12mL / min, and stir at 50°C for 45min;

[0021] (3) Stand and age for 22 hours after the reaction; wash the precipitate with pure water, filter, and dry to obtain solid neodymium carbonate;

[0022] (4) Calcining solid neodymium carbonate at a temperature of 850° C. for 2.5 hours to obtain a hollow spherical neodymium oxide with a large specific surface area.

[0023] The large specific surface area hollow spherical neodymium oxide specific surface area of ​​this embodiment is 8~10m 2 / g, the central particle diameter D50 is 40-50 μm, and the neodymium oxide conte...

Embodiment 2

[0025] (1) Take the neodymium sulfate obtained by rare earth extraction and separation and place it in the sedimentation tank, add 8 times the weight of 1.7mol / L neodymium sulfate salt solution in deionized water, then add 0.05 times of fatty alcohol polyoxyethylene ether, and 0.07 times of cyclodextrin , stirring for 13 minutes;

[0026] (2) Add 3 times of 4mol / L sodium bicarbonate dropwise at a rate of 11mL / min to the above mixture, and stir at 60°C for 55min;

[0027] (3) Stand and age for 18 hours after the reaction; wash the precipitate with pure water, filter, and dry to obtain solid neodymium carbonate;

[0028] (4) Calcining solid neodymium carbonate at a temperature of 900°C for 3 hours to obtain a hollow spherical neodymium oxide with a large specific surface area.

[0029] The hollow spherical neodymium oxide with large specific surface area in this embodiment has a specific surface area of ​​9-12 m2 / g, a central particle diameter D50 of 35-45 μm, and a neodymium o...

Embodiment 3

[0031] (1) Take the neodymium nitrate obtained by rare earth extraction and separation and place it in the sedimentation tank, add 6 times the weight of 1.9mol / L neodymium nitrate salt solution in deionized water, then add 0.1 times fatty alcohol polyoxyethylene ether, 0.06 times cyclodextrin , stirring and reacting for 14min;

[0032] (2) Add 3 times 3.5mol / L sodium bicarbonate dropwise at a rate of 16mL / min to the above mixture, and stir at 55°C for 60min;

[0033] (3) Stand and age for 20 hours after the reaction; wash the precipitate with pure water, filter, and dry to obtain solid neodymium carbonate;

[0034] (4) Calcining solid neodymium carbonate at a temperature of 950° C. for 3.5 hours to obtain a hollow spherical neodymium oxide with a large specific surface area.

[0035] The large specific surface area hollow spherical neodymium oxide specific surface area of ​​this embodiment is 8m 2 / g, the central particle diameter D50 is 35 μm, and the content of neodymium o...

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Abstract

The invention discloses a preparation method of large specific surface area hollow spherical neodymium oxide. The preparation method comprises: extracting and separating rare earth to obtain a neodymium salt solution, placing the neodymium salt solution into a precipitation tank, adding 5-8 times of deionized water, 0.05-0.1 times of fatty alcohol polyoxyethylene ether and 0.05-0.1 times of cyclodextrin into the precipitation tank on the basis of the weight of the neodymium salt solution, carrying out stirring for a reaction for 10-15min, adding 3 times of sodium bicarbonate with a concentration of 2.5-4 mol / L into the mixed solution at a rate of 9-16ml / min drop by drop, carrying out stirring at 50-70 DEG C for a reaction for 30-60min, after the reaction, standing to age the reaction product for 10-30h, washing, filtering and drying the precipitates through pure water to obtain solid neodymium carbonate, and calcining the solid neodymium carbonate at 800 to 950 DEG C for 2.5-3.5h to obtain the spherical porous neodymium oxide. The neodymium oxide has a hollow spherical structure, a specific surface area of 7-15 m<2> / g, central particle diameters D50 of 30-50 micrometers, high purity and a high neodymium yield. The preparation method is easy to operate, has short production time and realizes a low production cost.

Description

technical field [0001] The invention relates to a preparation process of a rare earth metal neodymium oxide, in particular to a preparation method of a hollow spherical neodymium oxide with a large specific surface area. Background technique [0002] Neodymium oxide has a wide range of uses, and can be used to manufacture rare earth functional materials such as magnetic materials, rare earth ceramics, laser crystals, luminescent materials, superconducting materials, and catalytic materials. Adding a small amount of neodymium oxide to the alloy can improve the high temperature resistance, corrosion resistance and mechanical properties of the alloy, and it is mostly used as aerospace materials. Neodymium-doped yttrium neodymium garnet is widely used in welding and cutting of thin materials; it is also used as a substitute for a scalpel for excision or disinfection of wounds. Neodymium oxide is also used in the coloring of glass and ceramic materials and as an additive in rubb...

Claims

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Application Information

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IPC IPC(8): C01F17/00
CPCC01F17/206C01P2004/34C01P2004/61C01P2006/12C01P2006/80
Inventor 王颖皓
Owner 王颖皓