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Nanometer magnesium hydroxide slurry as well as preparation method and application thereof

A nano-magnesium hydroxide and slurry technology is applied in the field of nano-magnesium hydroxide and its preparation to achieve the effect of improving and realizing waste utilization.

Active Publication Date: 2019-10-22
CHINA UNIV OF GEOSCIENCES (BEIJING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to obtain high-quality magnesium hydroxide products, magnesium oxide is generally dissolved in acid and converted into magnesium salt and then precipitated with lye. The quality of magnesium hydroxide obtained by this method is good, but there is secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The present embodiment provides a kind of nano-magnesium hydroxide slurry, and the preparation method comprises the following steps:

[0029] 1) Lightly burned magnesium powder with an MgO content of about 65% is used as raw material, mixed with sodium citrate and water at a mass ratio of 1:0.03:4, and the pH of the mixed system is controlled at 10. Carry out ultra-fine grinding; during grinding, the temperature is controlled at 80°C, the grinding time is 180 minutes, and the grinding speed is 1300 rpm, wherein the grinding medium is a steel ball with an average particle size of 1mm;

[0030] 2) Add phthalate to the system in step 1), and obtain highly dispersed nano-magnesium hydroxide slurry after sufficient modification; wherein, the mass ratio of light-burned magnesium powder to phthalate is 1:0.03.

[0031] The average particle diameter of the nano-magnesium hydroxide slurry that the present embodiment obtains is 80nm, and at least 90% of the particles have a parti...

Embodiment 2

[0033] The present embodiment provides a kind of nano-magnesium hydroxide slurry, and the preparation method comprises the following steps:

[0034] 1) Use lightly burned magnesium powder with an MgO content of about 65% as raw material, mix it with sodium citrate and water at a mass ratio of 1:0.02:4, control the pH of the mixed system at 11, and mix it in a medium stirring mill Carry out ultra-fine grinding; during grinding, the temperature is controlled at 75°C, the grinding time is 160 minutes, and the grinding speed is 1300 rpm, wherein the grinding medium is a steel ball with an average particle size of 2mm;

[0035] 2) Add phthalate to the system in step 1), and obtain highly dispersed nano-magnesium hydroxide slurry after sufficient modification; wherein, the mass ratio of light-burned magnesium powder to phthalate is 1:0.04.

[0036] The average particle diameter of the nano-magnesium hydroxide slurry that the present embodiment obtains is 100nm, and at least 90% of t...

Embodiment 3

[0038] The present embodiment provides a kind of nano-magnesium hydroxide slurry, and the preparation method comprises the following steps:

[0039] 1) Lightly burned magnesium powder with an MgO content of about 65% is used as raw material, mixed with sodium citrate and water at a mass ratio of 1:0.02:5, and the pH of the mixed system is controlled at 11. Carry out ultra-fine grinding; during grinding, the temperature is controlled at 80°C, the grinding time is 180 minutes, and the grinding speed is 1400 rpm, wherein the grinding medium is a steel ball with an average particle size of 2mm;

[0040] 2) Add phthalate to the system in step 1), and obtain highly dispersed nano-magnesium hydroxide slurry after sufficient modification; wherein, the mass ratio of light-burned magnesium powder to phthalate is 1:0.04.

[0041] The average particle diameter of the nano-magnesium hydroxide slurry that the present embodiment obtains is 80nm, and at least 90% of the particles have a parti...

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Abstract

The invention provides nanometer magnesium hydroxide slurry as well as a preparation method and application thereof. The preparation method of the nanometer magnesium hydroxide slurry comprises the following steps: 1) uniformly mixing caustic-burned magnesia powder as a raw material, a dispersing agent and water according to the mass ratio of 1:(0.01-0.04):(4-6), controlling that the pH is not higher than 12 and adding a grinding medium for grinding, wherein the grinding temperature is 70-80 DEG C, the grinding time is 150-190 min, the grinding speed is 1200-1500 revolutions / minute, and the average particle size of the grinding medium is 0.5-3 mm; 2) adding a surface modifier into a system in the step 1) and performing full modification to obtain the nanometer magnesium hydroxide slurry; the mass ratio of the surface modifier to the caustic-burned magnesia powder is (0.03-0.05):1. The preparation method provided by the invention can directly convert the low-purity caustic-burned magnesium oxide into the magnesium hydroxide, thereby improving the utilization value of magnesium oxide wastes.

Description

technical field [0001] The invention relates to the technical field of environment-friendly materials, more specifically, to a nano-magnesium hydroxide and its preparation method and application. Background technique [0002] Magnesium oxide is an important chemical raw material. my country's magnesium oxide is mainly produced by calcination of magnesite. Its quality is affected by the type and content of impurities in magnesite. When the content of magnesium oxide is less than 65% or SiO 2 and Fe 2 o 3 When the content is high, it becomes a waste product. Liaoning Province, the main producing area of ​​magnesite in China, discharges a large amount of low-grade magnesite and low-quality magnesium oxide every year, causing very serious environmental pollution. About 20% of magnesium oxide in water is directly converted into magnesium hydroxide. In order to obtain high-quality magnesium hydroxide products, magnesium oxide is generally dissolved in acid and converted into m...

Claims

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Application Information

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IPC IPC(8): C01F5/14C02F1/28C02F1/52B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01F5/14C01P2004/62C01P2004/64C02F1/281C02F1/5254C02F2101/16C02F2101/20
Inventor 杜高翔谢艳王佼任凤国李男帅欢
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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