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Preparation method of 1-2-micron samarium oxide

A technology of samarium oxide and samarium chloride, applied in chemical instruments and methods, rare earth metal oxides/hydroxides, inorganic chemistry, etc., can solve the problems of time-consuming, cumbersome steps, high impurity content, etc., achieve short precipitation time, Good repeatability and uniform particle effect

Active Publication Date: 2016-10-26
FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, oxalic acid precipitates superfine samarium oxide, generally using sol-gel method, which is not only cumbersome, but also time-consuming and high in impurity content.

Method used

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  • Preparation method of 1-2-micron samarium oxide
  • Preparation method of 1-2-micron samarium oxide

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Experimental program
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Effect test

Embodiment 1

[0016] The samarium chloride solution has a concentration of 1.7 mol / L and a volume of 350 ml, and the pH is adjusted to be 2 with ammonia water with a concentration of 28% by mass. The concentration of oxalic acid was 1 mol / L, 5.3 g of polyethylene glycol was added, and the pH was adjusted to 4 with 28% aqueous ammonia. Control the molar ratio of oxalic acid to samarium chloride solution to be 1.8:1. Keep the temperature at 50°C, and add the previously treated samarium chloride solution into the oxalic acid solution for 10 minutes. Filter and wash. Incubate at 900°C for 2 hours, detect D 50 =1.26μm. Fe 2 o 3 (μg / g)=4.06ppm, SiO 2 (μg / g) - (μg / g) = 300ppm. The total amount of rare earth oxides is 99.05%. Scanning electron microscope picture as figure 1 .

Embodiment 2

[0018] The samarium chloride solution has a concentration of 1.3 mol / L and a volume of 100 ml, and the pH is adjusted to be 2 with ammonia water with a mass percent concentration of 28%. The concentration of oxalic acid was 1.5 mol / L, 1.8 g of polyethylene glycol was added, and the pH was adjusted to 5 with 28% aqueous ammonia. Control the molar ratio of oxalic acid to samarium chloride solution to be 1.8:1. Keep the temperature at 40°C, and add the previously treated samarium chloride solution into the oxalic acid solution for 5 minutes. Filter and wash. Incubate at 1000°C for 2 hours, detect D 50 =1.19 μm. Fe 2 o 3 (μg / g)=6.4ppm, SiO 2 (μg / g) - (μg / g) = 180ppm. The total amount of rare earth oxides is 99.5%. Scanning electron microscope picture as figure 2 .

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Abstract

The invention discloses a preparation method of 1-2-micron samarium oxide. The preparation method comprises the following steps: step 1, the concentration of oxalic acid is 0.8-1.5 mol / L, pH is regulated to 3-5 with an ammonia water solution with the mass fraction of 28%, and a dispersing agent polyethylene glycol accounting for 5%-10% by mass of samarium oxide is added; the concentration of a samarium chloride solution is 0.8-2.0 mol / L, and pH is regulated to 2 with the ammonia water solution with the mass fraction of 28%; step 2, oxalic acid and the samarium chloride solution are proportioned in the mole ratio being 1.8:1, under the condition of constant temperature of 40-60 DEG C, the samarium chloride solution after pH value regulation in the step 1 is added to the oxalic acid solution after pH value regulation in the step 1, and precipitation is performed for 3-20 min; step 3, after a reaction, filtering and washing are performed; burning is performed at 900-1,000 DEG C and heat preservation is performed for 2 h; an ultrafine samarium oxide product with the particle size of 1-2 microns, uniform particle and rod-shaped morphology is obtained.

Description

technical field [0001] The invention relates to a preparation method of 1-2 micron samarium oxide. Background technique [0002] The unique electronic configuration of rare earth elements makes the ultrafine powder materials of rare earth compounds or rare earth oxides have many special properties and applications. Due to the small size effect, surface effect, quantum size effect and macroscopic quantum tunneling effect of the ultrafine powder material of rare earth oxide, the ultrafine powder material has characteristics that conventional materials do not have in terms of light, electricity, and magnetism, and is therefore highly valued. The society pays great attention. Samarium oxide superfine powder has high catalytic activity due to its large specific surface area, which can improve the catalytic performance of precious metal catalysts in automobile exhaust catalysts, reduce the amount of precious metals used and reduce costs. In terms of magnetic materials, samarium ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00
CPCC01F17/206C01P2004/03C01P2004/61
Inventor 周晓宏喻小珍傅志勤余建勇
Owner FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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