Magnesium hydroxide microparticles, magnexium oxide microparticles, and method for producing each

A technology of magnesium hydroxide and fine particles, applied in the direction of magnesium hydroxide, magnesium oxide, etc., can solve the problems of not being able to obtain fine particles with uniform particle size and difficult to control particle size, and achieve high availability, small particle size, and particle size uniform effect

Inactive Publication Date: 2013-06-05
TATEHO CHEM IND CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this method, it is difficult to control the particle size, and there is a problem that fine particles with a uniform particle size cannot be obtained.

Method used

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  • Magnesium hydroxide microparticles, magnexium oxide microparticles, and method for producing each
  • Magnesium hydroxide microparticles, magnexium oxide microparticles, and method for producing each

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] As the crude magnesium chloride aqueous solution, a magnesium chloride aqueous solution having a purity of 90% by mass or higher and a concentration of 3.5 mol / L was prepared. The concentration was adjusted by adding pure water (passed through an ion exchange resin to purify to a conductivity of 0.1 μS / cm or less) to this magnesium chloride aqueous solution to obtain a crude magnesium chloride aqueous solution with a concentration of 2.0 mol / L.

[0088] Then, in the crude magnesium chloride aqueous solution with a concentration of 2.0mol / L, add a sodium hydroxide aqueous solution with a concentration of 17.84mol / L to make them react according to a conversion rate of 20mol%, and then add 500 mass ppm of magnesium hydroxide with respect to the generated magnesium hydroxide. An acrylamide-sodium acrylate copolymer as a flocculant was used to coagulate and precipitate magnesium hydroxide, and the supernatant was collected to obtain an aqueous magnesium chloride solution.

...

Embodiment 2

[0093] In the reaction of the magnesium chloride aqueous solution and the sodium hydroxide aqueous solution, the conversion rate was 120 mol%, and the hydrothermal treatment time was 0.5 hour, and it carried out similarly to Example 1.

Embodiment 3

[0095] In the reaction of the magnesium chloride aqueous solution and the sodium hydroxide aqueous solution, the conversion rate was 105 mol%, and the hydrothermal treatment time was 3 hours, and it carried out similarly to Example 1.

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Abstract

Highly pure magnesium hydroxide microparticles and highly pure magnesium oxide microparticles that are even and have a small particle size are provided. Regarding the magnesium hydroxide microparticles, the BET specific surface area is at least 5 m2/g, the volume-based cumulative 50% particle diameter (D50) resulting from laser diffraction scattering measurement of the particle size distribution is 0.1-0.5 [mu]m, the ratio D90/D10 between the volume-based cumulative 90% particle diameter (D90) and the volume-based cumulative 10% particle diameter (D10) resulting from laser diffraction scattering measurement of the particle size distribution is no greater than 10, and the purity is at least 99.5 mass%. Regarding the magnesium oxide microparticles, the BET specific surface area is at least 5 m2/g, the volume-based cumulative 50% particle diameter (D50) resulting from laser diffraction scattering measurement of the particle size distribution is 0.1-0.5 [mu]m, the ratio D90/D10 between the volume-based cumulative 90% particle diameter (D90) and the volume-based cumulative 10% particle diameter (D10) resulting from laser diffraction scattering measurement of the particle size distribution is no greater than 10, and the purity is at least 99.5 mass%.

Description

technical field [0001] The present invention relates to small and uniform high-purity magnesium hydroxide fine particles and high-purity magnesium oxide fine particles and their production methods. Background technique [0002] Magnesium hydroxide and magnesium oxide are inorganic materials used in various fields. Examples of the former include additives, resin fillers, highly functional materials, and catalysts. Examples of the latter include refractory materials, Additives, resin fillers, high-performance materials, electrical steel sheet materials, catalysts, etc. Including these uses, magnesium hydroxide and magnesium oxide are often required to be in a state of high purity, small particle size, and uniform fine particles. [0003] As a method for producing magnesium hydroxide having a small and uniform particle size, a method of preparing magnesium hydroxide fine particles of 10nm to 1000nm by adding an alkali substance to an aqueous solution containing magnesium hydro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/22C01F5/08
CPCC01P2006/12C01F5/14C01F5/02C01P2004/52C01F5/08C01F5/22
Inventor 大崎善久
Owner TATEHO CHEM IND CO
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