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Simple dispersion method of magnesium hydrate

A magnesium hydroxide and dispersion technology, applied in the direction of magnesium hydroxide, etc., can solve the problems of unfavorable industrial production, poor dispersion of magnesium oxide, harsh preparation conditions, etc., and achieve the effect of low equipment requirements, good stability, and uniform particle size

Inactive Publication Date: 2018-11-02
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of dispersion control in the liquid phase precipitation process leads to poor dispersion of magnesium oxide. The existing subsequent dispersion treatment needs to be treated under high-temperature concentrated alkali hydrothermal conditions, and the hard agglomeration is broken through the enhanced dissolution and crystallization of high-temperature concentrated alkali. Although A well-dispersed magnesium hydroxide product can be prepared, but the preparation conditions are harsh, which is not conducive to industrial production

Method used

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  • Simple dispersion method of magnesium hydrate
  • Simple dispersion method of magnesium hydrate
  • Simple dispersion method of magnesium hydrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Take by weighing 20 grams of agglomerated magnesium hydroxide raw material (average agglomerated particle diameter 5 microns), add it to the magnesium chloride aqueous solution of 0.5mol / L, make the suspension of solid content 0.5wt%, at 10 ℃, stirring (50 rev / Minutes) under the conditions of reaction for 6 hours, filtered, washed, dried (105 ° C, 8 hours), to obtain a monodisperse flaky magnesium hydroxide with an average particle size of 0.4 microns.

Embodiment 2

[0043] Take by weighing 20 grams of agglomerated magnesium hydroxide raw material (average agglomerated particle diameter 50 microns), add it to the magnesium chloride aqueous solution of 1.0mol / L, make the suspension of solid content 10wt%, at 40 ℃, stirring (300 rev / min ) for 36 hours, filtered, washed, and dried (105° C., 8 hours), to obtain monodisperse flaky magnesium hydroxide with an average particle size of 3.0 microns.

Embodiment 3

[0045] Take by weighing 20 grams of agglomerated magnesium hydroxide raw material (average agglomerated particle diameter 20 microns), it is added the magnesium chloride aqueous solution of 3.5mol / L, makes the suspension of solid content 8wt%, at 30 ℃, stirring (300 rpm ) under the conditions of reaction for 120 hours, filtered, washed, and dried (105° C., 8 hours), to obtain monodisperse flaky magnesium hydroxide with an average particle size of 2.2 microns.

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Abstract

The invention discloses a simple dispersion method of magnesium hydrate, which takes agglomerated magnesium hydroxide as magnesium source and water solution containing magnesium chloride medium as dispersion liquid, immersing magnesium source in the dispersion liquid in room temperature to prepare suspension liquid, the dispersion liquid conducts selective adsorbption dissolution-corrosion on theactive site of the magnesium source to form trace new phase, which implements the dispersion of agglomerated magnesium hydroxide, the simple dispersion method provided by the invnetion does not need harsh processes such as hydration and hydrothermal, can directly transform agglomerated magnesium hydroxide into mono-disperse flake magnesium hydroxide under moderate conditions such as room temperature, the technology is simple in process. Magnesium hydroxide after dispersion is even in grain size, good in stability, and the requirements to equipment is low, the cost is low., the dispersion liquid can be circularly used, and is environmentally friendly without pollution.

Description

technical field [0001] The invention relates to the technical field of preparation of inorganic chemical materials, in particular to a simple dispersion method of magnesium hydroxide. Background technique [0002] Flame retardants are divided into inorganic flame retardants and organic flame retardants. Since organic flame retardants produce toxic gases and malignant carcinogens when burned, they are gradually replaced by inorganic flame retardants. Magnesium hydroxide is an additive inorganic flame retardant. Compared with similar inorganic flame retardants, magnesium hydroxide has better smoke suppression effect and higher thermal decomposition temperature, and has been widely used in polymer composite materials. [0003] The special crystal structure and physical and chemical properties of magnesium hydroxide itself make magnesium hydroxide prepared by chemical or physical methods without exception have defects such as serious agglomeration, difficulty in dispersing, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/14
CPCC01F5/14C01P2004/62
Inventor 张军平王春姜峨马韦刚傅晟伟邱添
Owner NUCLEAR POWER INSTITUTE OF CHINA