Preparation method of nanoscale high-purity light magnesium carbonate

A light magnesium carbonate, nano-scale technology, applied in the direction of magnesium carbonate, nanotechnology, nanotechnology, etc., can solve the problems of wide particle size distribution, low quality, high cost, etc., and achieve the effect of fine particle size, low cost and narrow distribution

Inactive Publication Date: 2018-11-06
SUZHOU ZEMEI NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems of low quality, wide particle size distribution and high cost in the preparation of nano-scale high-purity light magnesium carbonate in the prior art, and provides a method for preparing nano-scale high-purity light magnesium carbonate from industrial grade magnesium hydroxide coarse powder. process of magnesium carbonate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: Weigh deionized water, technical grade magnesium hydroxide coarse powder and aqueous dispersant according to the mass ratio of 50:40:10, and mix them evenly; put the homogeneously mixed solution into a sand mill to carry out a wet process. Phase ball milling, the ball milling medium is 0.1mm high-purity yttria-stabilized zirconia ceramic balls, and the mixture is wet-milled for 40 hours to obtain a uniformly mixed magnesium hydroxide slurry with an average particle size of 100 nanometers; The ammonium hydrogen solution was slowly added to the prepared nano-scale magnesium hydroxide slurry for reaction, the temperature was controlled at 90 °C, the pH value was controlled at 9.0, and the reaction time was 6 hours; carbon dioxide was continuously introduced into the process to carry out ammonium bicarbonate double The reverse reaction of hydrolysis is carried out until all the magnesium hydroxide is converted into light magnesium carbonate precipitate; the obtain...

Embodiment 2

[0022] Example 2: Weigh deionized water, technical grade magnesium hydroxide coarse powder and aqueous dispersant according to the mass ratio of 70:29:1, and mix them uniformly; put the uniformly mixed solution into a sand mill to carry out a wet process. Phase ball milling, the ball milling medium is 0.1mm high-purity yttria-stabilized zirconia ceramic balls, and the mixture is wet-milled for 20 hours to obtain a uniformly mixed magnesium hydroxide slurry with an average particle size of 100 nanometers; The ammonium hydrogen solution was slowly added to the prepared nano-scale magnesium hydroxide slurry for reaction, the temperature was controlled at 80 °C, and the pH value was controlled at 9.0, and the reaction time was 3 hours; carbon dioxide was continuously introduced into the process to carry out ammonium bicarbonate bisulfite. The reverse reaction of hydrolysis is carried out until all the magnesium hydroxide is converted into light magnesium carbonate precipitate; the ...

Embodiment 3

[0023] Example 3: Weigh deionized water, technical grade magnesium hydroxide coarse powder and aqueous dispersant according to the mass ratio of 80:10:10, and mix them uniformly; put the uniformly mixed solution into a sand mill to carry out a wet process. Phase ball milling, the ball milling medium is 0.05mm high-purity yttria-stabilized zirconia ceramic balls, and the mixture is wet-milled for 2 hours to obtain a uniformly mixed magnesium hydroxide slurry with an average particle size of 50 nanometers; The ammonium hydrogen solution was slowly added to the prepared nano-scale magnesium hydroxide slurry for reaction, the temperature was controlled at 60 °C, the pH value was controlled at 8.5, and the reaction time was 1 hour; carbon dioxide was continuously introduced into the process to carry out ammonium bicarbonate bisulfite. The reverse reaction of hydrolysis is carried out until all the magnesium hydroxide is converted into light magnesium carbonate precipitate; the obtai...

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Abstract

The invention discloses a preparation method of nanoscale high-purity light magnesium carbonate. Nano magnesium carbonate adopts industrial grade magnesium hydrate coarse powder as a raw material, magnesium hydrate is ground to be nanoscale suspension slurry through liquid phase grinding, then an ammonium bicarbonate solution is slowly added into the nanoscale magnesium hydrate slurry to be reacted, meanwhile, carbon dioxide is introduced to serve as a balance promoting agent of a double hydrolysis backward reaction of ammonium bicarbonate, till all of magnesium hydrate is transformed to be magnesium carbonate sediment. Solid sediment is filtered and separated out, and then dried, and the nanoscale high-purity light magnesium carbonate powder is obtained. The preparation method adopts thecheap industrial grade magnesium hydrate coarse powder and ammonium carbonate as the raw materials, and prepares the high-quality high-purity nanoscale light magnesium carbonate, the technology is easy to operate, the reaction condition is moderate, the demand for equipment is low, and the requirement for batch industrial production is satisfied.

Description

technical field [0001] The invention relates to a process for preparing nano-level high-purity light magnesium carbonate from industrial-grade magnesium hydroxide coarse powder, and belongs to the field of fine chemicals. Background technique [0002] Light magnesium carbonate white monoclinic crystal or amorphous powder, non-toxic, odorless, stable in air. It has the characteristics of non-combustion and light texture, and can be used for heat insulation and high temperature resistant fire insulation materials. Asbestos-grade light magnesium carbonate is an excellent insulating material and is used in shipbuilding and boiler manufacturing, as well as in the manufacture of advanced glass products, magnesium salts, pigments, paints, fire-retardant coatings, printing inks, ceramics, cosmetics, toothpaste and other daily necessities Chemicals and pharmaceutical products, etc. Food-grade light magnesium carbonate can be used as flour additive, desiccant, color retention agent,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/24B82Y30/00
CPCB82Y30/00C01F5/24C01P2004/64C01P2006/80
Inventor 莫云泽
Owner SUZHOU ZEMEI NEW MATERIAL TECH
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