Technology for preparing nanometer rare-earth oxide

A nano-rare earth and oxide technology, applied in the direction of rare earth metal compounds, chemical instruments and methods, oxygen/ozone/oxide/hydroxide, etc., can solve the problems of high equipment requirements, uneven particles, uneven particle size, etc. Achieve the effect of eliminating agglomeration, small and uniform particles, and uniform particles

Inactive Publication Date: 2007-01-24
BAOTOU HUAMEI RE PRODS
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Problems solved by technology

[0002] At present, there are many processes for preparing nano-rare earth oxides, but there are disadvantages such as serious product agglomeration, uneven particle size, long process, complicated operation, high equipment requirements, small output, and high cost.
For example, Chinese patent (CN1230582) discloses a rare earth oxide nano-fluorescent powder and its preparation method. It adopts a homogeneous precipitation method, which combines homogeneous precipitation and sonochemical method to manufacture a precursor. Its disadvantage is that the precursor and nano-rare earth oxidation The powder is easy to agglomerate and the particles are uneven, which affects the product quality

Method used

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  • Technology for preparing nanometer rare-earth oxide

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Effect test

Embodiment 1

[0010] Embodiment 1: get 44 grams of cerium carbonate (CeO 2 45%), dissolved with 1:1 nitric acid, adjusted to PH 4, filtered, added 330 grams of urea to the solution, diluted to 1 liter with deionized water, added 5% (V / V) n-amyl alcohol, mixed, adjusted To pH 7, keep at 82±2°C for 2 hours, settle for 4 hours, take out the supernatant, add 1% (V / V) n-amyl alcohol to the precipitate, connect an ultrasonic generator, and wash at a temperature of 50±5°C. Time is 2 hours, filter, the filter cake is dried at 80°C for 2 hours, and then calcined at 500°C for 2 hours to obtain nano-cerium oxide with a central particle size of D 50 30nm..

Embodiment 2

[0011] Embodiment 2: get 88 grams of cerium carbonate (CeO 2 45%), dissolved with 1:1 nitric acid, adjusted to PH 4, filtered, added 660 grams of urea in the solution, diluted to 2 liters with deionized water, added 10% (V / V) n-amyl alcohol, mixed, adjusted to PH 7, keep at 85±2°C for 1.5 hours, settle for 4 hours, take out the supernatant, add 2% (V / V) n-amyl alcohol to the precipitate, connect the ultrasonic generator, wash, the temperature is 40±5°C, time Filter for 1 hour, dry the filter cake at 80°C for 2 hours, and then calcinate at 500°C for 2 hours to obtain nano-cerium oxide with a central particle size of D 50 29nm..

Embodiment 3

[0012] Embodiment 3: get 44 grams of lanthanum carbonate (La 2 o 3 43%), dissolved with 1:1 nitric acid, adjusted to PH 4, filtered, added 330 grams of urea to the solution, diluted to 1 liter with deionized water, added 5% (V / V) n-amyl alcohol, mixed, adjusted To pH 7, keep at 82±2°C for 2 hours, settle for 4 hours, take out the supernatant, add 1% (V / V) n-amyl alcohol to the precipitate, connect an ultrasonic generator, and wash at a temperature of 50±5°C. After 2 hours, filter, and dry the filter cake at 80°C for 2 hours, then calcinate at 500°C for 2 hours to obtain nano-lanthanum oxide with a central particle size of D 50 28nm..

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Abstract

A process for preparing nano rearearth oxide wherein the rearearth carbonic acid is used as raw material, dissolved in nitric acid, filtered, added with slow released precipitator and dispersant after being filtered, added with dispersant after obtaining fore unit, through ultrasonic wave oscillating, microemulsion ultrasonic washing, filtering, drying, calcinating to obtain said nano rearearth oxide. In said invention, microemulsion homogeneous precipitation process is used which is favour to form precipitation grain kernel and adverse to kernel growth to keep the productive grain size small and uniform and eliminate agglomeration.

Description

1. Technical field [0001] The invention relates to a method for preparing nanometer rare earth oxides, which belongs to the field of rare earth material preparation. 2. Background technology [0002] At present, there are many processes for preparing nano-rare earth oxides, but there are disadvantages such as serious product agglomeration, uneven particle size, long process, complicated operation, high equipment requirements, small output, and high cost. For example, Chinese patent (CN1230582) discloses a rare earth oxide nano-fluorescent powder and its preparation method. It adopts a homogeneous precipitation method, which combines homogeneous precipitation and sonochemical method to manufacture a precursor. Its disadvantage is that the precursor and nano-rare earth oxidation The powder is easy to agglomerate, and the particles are uneven, which affects the product quality. 3. Contents of the invention [0003] The purpose of the present invention is to provide a kind of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F17/00C01B13/36
Inventor 叶祖光马永茂
Owner BAOTOU HUAMEI RE PRODS
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