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Method of preparing superfine micro-particle and nano granule

A nanoparticle and ultrafine particle technology, applied in the direction of nanostructure manufacturing, chemical instruments and methods, nanotechnology, etc., can solve the problems of unfavorable industrial production, high technical equipment requirements, and low purity of nanoparticles, and achieve easy sedimentation and washing and Filtration, uniform and single shape, high purity effect

Active Publication Date: 2008-08-06
CHINA MINMETALS BEIJING RES INST OF RE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the above-mentioned existing method for preparing nanoparticles, there are also the following defects: if the nanoparticles are required to have high purity, good dispersibility, and uniform particle size, the requirements for technical equipment are high, or the process is complicated, difficult to control, and the cost of input is high. Large, not conducive to industrial production, such as vacuum condensation method, vapor deposition method, hydrothermal synthesis method, sol-gel method, microemulsion method, metal alkoxide method; if you want low investment, simple process, easy to control, the produced nanometer The purity of the particles is low and the particles are uneven, such as physical pulverization and mechanical ball milling

Method used

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  • Method of preparing superfine micro-particle and nano granule
  • Method of preparing superfine micro-particle and nano granule

Examples

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Effect test

Embodiment 1

[0038] 1L of 0.5mol / L yttrium nitrate solution, 1L of a mixed solution of 1mol / L NaOH and 0.5mol / L KOH was added at 25°C as a precipitant, wherein Na + 、K + The total concentration of metal ions is 1.5mol / L, and the amount of precipitant added is 100% of the theoretical amount. Add 240g of NaOH solid and 336g of KOH solid to make the system OH - 6mol / L, heated to 150°C for 2 hours, filtered and washed with water until neutral, dried at 80°C for 1 hour, and burned at 600°C for 1 hour. Yttrium oxide particles were obtained, D50 = 300 nm.

Embodiment 2

[0040] After mixing 1L of 2mol / L lanthanum chloride solution and 1L of 0.5mol / L cerium chloride solution evenly, add 2.8L of mixed solution of 2mol / L ammonia water and 2mol / L ammonium bicarbonate at 80°C for precipitation, in which NH 4 + The total ion concentration is 4mol / L, and the amount of precipitant added is 150% of the theoretical amount. Add 768g of NaOH solid to make the system OH -4mol / L, heated to 130°C for 2 hours, filtered and washed with water until neutral, dried at 150°C for 4 hours, and burned at 900°C for 2 hours. Lanthanum cerium oxide particles were obtained, D50=600nm.

Embodiment 3

[0042] 0.5mol / L samarium europium gadolinium chloride solution 1L, add 0.5mol / L ammonium carbonate and 0.5mol / L sodium carbonate mixed solution 2.25L precipitation at 95 ℃, wherein Na + , NH 4 + The total ion concentration is 2mol / L, and the amount of precipitant added is 300% of the theoretical amount. Add 35wt% liquid caustic soda 190g, make system OH - 0.5mol / L, heated to 95°C for 10 hours, filtered and washed with water until neutral, dried at 220°C for 10 hours, and burned at 1000°C for 10 hours. Samarium europium gadolinium oxide particles were obtained, D50 = 1.2 μm.

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Abstract

The invention discloses a preparation method of ultrafine particles and nano-particles, including the following steps: ammonia and / or ammonium bicarbonate and / or ammonium carbonate and / or sodium bicarbonate and / or sodium carbonate and / or sodium hydroxide and / or potassium hydroxide solution are added to metal nitrate or chloride to be precipitant; and superfluous sodium hydroxide and / or potassium hydroxide are added to the precipitant; precipitated particles are crystallized under high temperature and strong alkali, which are not agglomerate; products are obtained by washing, drying and firing. The ultrafine particles and the nano-particles prepared by adopting the method of the invention have high purity, even granularity and even as well as single appearance, which are crystal of aciform or fusiform; the granularity of the products can be adjusted and controlled by controlling thickness, temperature and alkalinity of the reaction. Metal oxide of the whole technology has high yield, small loss, simple process, easy operation, precipitate which is easy to be precipitated, washed and filtered and low manufacturing cost; the metal oxide of the whole technology is suitable for industrialization manufacturing. The waste alkaline water is recycled which causes little pollution to the environment.

Description

technical field [0001] The invention relates to the field of material synthesis, in particular to a method for preparing ultrafine particles and nanoparticles of metal oxides, in particular to a method for preparing ultrafine particles and nanoparticles. Background technique [0002] Since Bining and Rohrer of IBM's Zurich Research Institute invented the tunneling microscope in 1981, nanotechnology has been born. Since then, there has been an upsurge of nanotechnology research all over the world. Nanomaterials have different characteristics from other size materials due to their microscopic size: small size effect, surface and interface effect, quantum size effect and macroscopic quantum tunneling effect. These properties make nanomaterials widely used in various fields, such as coatings, catalysts, electrochemistry, photochemistry, structural materials (such as optoelectronic devices), and biological fields. Particles with a particle size above 10 μm can be easily obtaine...

Claims

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Application Information

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IPC IPC(8): C01B13/14C01F17/00C01G23/053C01G9/02C01G49/06B82B3/00
Inventor 廖春生
Owner CHINA MINMETALS BEIJING RES INST OF RE
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