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Preparation method of high-purity magnesium hydroxide

A magnesium hydroxide, high-purity technology, applied in magnesium hydroxide and other directions, can solve the problems of uneven particles, insufficient purity of magnesium hydroxide, poor surface activity, etc., and achieve the effect of uniform particles, good surface activity and high purity

Inactive Publication Date: 2016-03-02
SUZHOU ZEMEI NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the current preparation method of magnesium hydroxide, the purity of the prepared magnesium hydroxide is not high enough, the particles are not uniform, and the surface activity is poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0009] The specific implementation of the present invention will be further described below in conjunction with the examples. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0010] The technical scheme of concrete implementation of the present invention is:

[0011] A preparation method of high-purity magnesium hydroxide, comprising the steps of:

[0012] 1) Add a certain amount of pure water into the electric heating reactor in advance, stir and raise the temperature to 50°C;

[0013] 2) Prepare a brine solution with a concentration of 2.6mol / l and a supersaturated sodium hydroxide solution, and slowly add them dropwise to the above-mentioned clear solution, stir evenly, wait for the reaction to be complete, raise the temperature to 55°C and keep it warm for 60 minutes, and pass through a centrifugal pump Transfer to intermediate reactor;

[00...

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PUM

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Abstract

The invention discloses a preparation method of high-purity magnesium hydroxide. the preparation method comprises the following steps: 1) adding a certain amount of pure water into an electrical heating reaction vessel in advance, stirring and heating to 50 DEG C; 2) preparing a brine solution with its concentration being 2.6 mol / l and an oversaturated sodium hydroxide solution, slowly dropwise adding the brine solution and the oversaturated sodium hydroxide solution into the above clear solution, uniformly stirring, reacting fully, heating to 55 DEG C and carrying out heat insulation for 60 min, and transferring a reaction product into a intermediate reaction vessel through a centrifugal pump; 3) pumping the produced magnesium hydroxide slurry into a filter press, washing with distilled water for five times, controlling conductivity within 500 us / cm, and finally drying at 125 DEG C for 5 h, so as to obtain a product. The prepared magnesium hydroxide has advantages of high purity, uniform particle size and good surface activity.

Description

technical field [0001] The invention relates to a preparation method of high-purity magnesium hydroxide. Background technique [0002] Magnesium hydroxide is a colorless hexagonal column crystal or white powder, hardly soluble in water and alcohol, soluble in dilute acid and ammonium salt solution, the aqueous solution is alkaline, and its solubility in water is very small. Magnesium hydroxide is an excellent flame retardant for plastic and rubber products. In terms of environmental protection, as a flue gas desulfurizer, it can replace caustic soda and lime as a neutralizer for acid-containing wastewater. It is also used as an oil additive for anti-corrosion and desulfurization. In addition, it can also be used in the electronics industry, medicine, sugar refining, as insulation materials and in the manufacture of other magnesium salt products. In the current preparation method of magnesium hydroxide, the purity of magnesium hydroxide prepared by it is not high enough, t...

Claims

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Application Information

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IPC IPC(8): C01F5/22
CPCC01F5/22
Inventor 莫云泽
Owner SUZHOU ZEMEI NEW MATERIAL TECH