Method for producing nano cerium oxide under supergravity action

A nano-cerium oxide, super-gravity technology, applied in chemical instruments and methods, nanotechnology, rare earth metal oxides/hydroxides, etc., can solve problems such as wide particle size distribution of products, non-polar solvents, etc., and achieve production process safety. The effect of improving reliability, saving production costs and improving environmental protection

Inactive Publication Date: 2018-10-16
德昌县志能稀土有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] The present invention provides a method for producing nano-cerium oxide by high gravity, and aims to provide a brand-new industrial production method for nano-cerium oxide based on the principle of high gravity and has no special requirements for solvents, so as to solve the problem of wide particle size distribution of existing equipment products , The need to use volatile and flammable non-polar solvents in the production process

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  • Method for producing nano cerium oxide under supergravity action
  • Method for producing nano cerium oxide under supergravity action
  • Method for producing nano cerium oxide under supergravity action

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Embodiment 1

[0057] The method for producing nano cerium oxide by high gravity comprises the following steps:

[0058] 1) Solution preparation: Dissolve cerium nitrate and urea completely with deionized water respectively to prepare a rare earth feed solution with a concentration of 0.1mol / L and a precipitant solution with a concentration of 0.5mol / L;

[0059] 2) Precursor preparation: continuously feed the rare earth material liquid and the precipitating agent solution into the supergravity centrifuge running at a stable speed of 500r / min, and keep the pH value of the mixed solution in the machine between 9 and 12 during the feeding process Precipitate for 0.3h under heating conditions at 40°C and centrifugation to obtain a thick slurry; wherein, the rare earth feed solution is added from the center of the rotor of the ultragravity centrifuge, and the precipitant solution is obtained from the ultragravity centrifuge The edge of the rotor is added, and the rare earth feed solution and prec...

Embodiment 2

[0065] The method for producing nano cerium oxide by high gravity comprises the following steps:

[0066] 1) Solution preparation: Dissolve cerium nitrate and urea completely with deionized water respectively to make a concentration of 0.2mol / L rare earth feed solution and a concentration of 1mol / L precipitant solution;

[0067]2) Precursor preparation: continuously feed the rare earth material liquid and the precipitant solution into the supergravity centrifuge running at a stable speed of 1500r / min, and keep the pH value of the mixed solution in the machine between 9 and 12 during the feeding process Precipitate for 3 hours under heating conditions at 100°C and centrifugation to obtain a thick slurry; wherein, the rare earth feed solution is added from the center of the rotor of the ultragravity centrifuge, and the precipitant solution is added from the center of the ultragravity centrifuge The edge of the rotor is added, and the rare earth feed solution and the precipitant ...

Embodiment 3

[0073] The method for producing nano cerium oxide by high gravity comprises the following steps:

[0074] 1) Solution preparation: Dissolve cerium nitrate and urea completely with deionized water respectively to prepare a rare earth feed solution with a concentration of 0.15mol / L and a precipitant solution with a concentration of 0.75mol / L;

[0075] 2) Precursor preparation: continuously feed the rare earth material liquid and the precipitant solution into the supergravity centrifuge running stably at a speed of 1000r / min, and keep the pH value of the mixed solution in the machine between 9 and 12 during the feeding process Precipitate for 2 hours under heating conditions at 70°C and centrifugation to obtain a thick slurry; wherein, the rare earth feed solution is added from the center of the rotor of the ultragravity centrifuge, and the precipitant solution is added from the center of the ultragravity centrifuge The edge of the rotor is added, and the rare earth feed solution...

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Abstract

The invention discloses a method for producing nano cerium oxide under the supergravity action. In a supergravity field, cerous nitrate or cerium chloride is used as a raw material, an alkaline liquidsuch as urea and ammonium bicarbonate is used as a uniform precipitant, a precursor is prepared in deionized water by controlling the pH value of a reaction solution, impurity removal and neutralization of the precursor are realized through ultrasonic washing, and nano cerium oxide particles are prepared finally through firing. The particle size and the distribution condition of the precursor arestrictly controlled by use of the improved supergravity method and control of the precipitation environment, so that the particle size distribution condition of the finally product, namely, nano cerium oxide particles, is strictly controlled, and the nano cerium oxide particles with controllable particle size and very narrow distribution are obtained. The homogenous precipitation process can be realized in polar solvent deionized water in a breakthrough manner, the production process is safe and reliable, the reliability is significantly improved, and the method is applicable to industrial production.

Description

technical field [0001] The invention relates to the field of preparation of nano-rare earth materials, in particular to a method for producing nano-cerium oxide by supergravity. Background technique [0002] Rare earth, as an important strategic resource, is known as the "gold" of industry, and it can make quantitative and qualitative changes in many fields such as military, metallurgy, petrochemical, high technology, and agriculture. For example, in the semiconductor industry, polishing powder made of cerium oxide can significantly improve the polishing efficiency and polishing effect of silicon wafers; in the petrochemical industry, molecular sieve catalysts made of rare earth metals have high activity, good selectivity, and resistance to heavy metal poisoning. Strong and many other advantages, so there are application examples of replacing aluminum silicate catalysts for petroleum catalytic cracking. [0003] As a representative of rare earth elements, cerium occupies th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00B82Y40/00
CPCB82Y40/00C01F17/206C01P2004/64
Inventor 李志超李洪岩
Owner 德昌县志能稀土有限责任公司
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