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Powder of rare-earth oxides with high apparent density and low specific surface area, and preparation method

A rare earth oxide, low specific surface area technology, applied in rare earth metal compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problem of unspecified specific surface area and particle size, etc., and achieves low cost, simple preparation process, and high yield. high rate effect

Inactive Publication Date: 2009-11-25
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In the above method, although the bulk density of the obtained cerium oxide is relatively large, the specific surface area and particle size are not described, and they are respectively used (NH 4 ) 2 C 2 o 4 、H 2 o 2 +NH 3 ·H 2 O is a precipitating agent, and there is no report of using carbonate as a precipitating agent to prepare high bulk density and low specific surface area rare earth oxides

Method used

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  • Powder of rare-earth oxides with high apparent density and low specific surface area, and preparation method

Examples

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Effect test

Embodiment 1

[0025] LaCePr mixed rare earth chloride solution obtained from Baotou Mine by grouping neodymium and samarium, and then separating praseodymium and neodymium, adjusted to a concentration of 0.6M and a pH value of 1.5. Take 1000mL of this solution, add 0.015g of polyacrylamide, and heat to 45°C , add 1.4L, 1.6M sodium carbonate aqueous solution under constant stirring, filter after standing for 2 hours, wash with water, dry at 80°C, burn at 1000°C for 2 hours, the heating rate is 300°C / h, and the bulk density is obtained 1.99g.cm -3 , The specific surface area is 1.06g.m -2 , LaCePr mixed rare earth oxide powder with a volume center particle diameter of 27.33 μm in a normal distribution.

Embodiment 2

[0027] The cerium nitrate solution obtained by dissolving industrial cerium carbonate in nitric acid is adjusted to a concentration of 0.9M and a pH value of 2.5. Take 1000mL of this solution, add 0.028g of tributyl phosphate, heat to 50°C, and add 3L under constant stirring. 1M ammonium bicarbonate aqueous solution, after standing for 4 hours, filter, wash with water, dry at 100°C, burn at 1000°C for 2 hours, the heating rate is 200°C / h, and the bulk density is 2.12g.cm -3 , The specific surface area is 0.85g.m -2 , Cerium oxide powder with a normal distribution and an average particle size of 29.07 μm. SEM of cerium oxide as figure 1 . It can be seen from the scanning electron microscope that CeO 2 It is an aggregate, cauliflower-like.

Embodiment 3

[0029]Dissolve yttrium oxide in hydrochloric acid to obtain yttrium chloride solution, adjust to a concentration of 0.58M, and a pH value of 2.3. Take 900ml of this solution, add 0.018g of polyacrylamide, heat to 45°C, and add 1L, 2.1M Ammonium bicarbonate aqueous solution, after standing for 12 hours, filtered, washed with water, dried at 120°C, burned at 900°C for 2 hours, and the heating rate was 100°C / h to obtain a bulk density of 2.07g.cm -3 , The specific surface area is 2.18g.m -2 , Yttrium oxide powder with a normal distribution and an average particle size of 24.51 μm.

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Abstract

This invention relates to a method for preparing rare earth oxide powder with high loose packing density and low specific surface area. The method comprises: precipitating rare earth salt (e.g., nitrate) solution containing additives with a precipitant (carbonate-containing compound), filtering the precipitate, oven-drying, and torrefying to obtain rare earth oxide powder with a loose packing density of 1.8-2.2 g / cm3, a specific surface area less than 3 g / cm2, and volume center diameters (D50) larger than 20 mu.m. The method has such advantages as simple process, and easy operation. The rare earth oxide powder can be used as a polishing material for gems, and an additive for glass and ceramics.

Description

1. Technical field [0001] The invention relates to a solution containing carbonate ions as a precipitating agent to precipitate a rare earth salt solution containing additives to prepare a rare earth oxide powder with a uniform particle size distribution and a high bulk density and a low specific surface area, and a preparation method thereof, belonging to powder materials Preparation technology field. 2. Background technology [0002] Rare earth elements have unique properties due to their unique electronic structures, and are known as a treasure trove of new materials. In recent years, my country's rare earth separation capacity and level have been rapidly improved, and various high-purity rare earth products have been able to be produced stably and in large quantities. With the development of high technology, the application of rare earth in the field of new materials is increasing, and the physical properties of rare earth materials have an important impact on its appli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F17/00
Inventor 李梅胡艳宏柳召刚张永强王觅堂王丽
Owner INNER MONGOLIA UNIV OF SCI & TECH
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