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Method for synthesizing active magnesium hydroxide

A magnesium hydroxide and synthesis method technology, applied in the direction of magnesium hydroxide, etc., can solve problems such as poor reaction characteristics, and achieve the effects of simple equipment process, fast reaction, and high desulfurization efficiency

Inactive Publication Date: 2008-07-09
李淑荣
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reaction characteristics of light-burned magnesium as an alkaline agent are very bad, and its performance is: ① insoluble in water; ② reacting with water (disinfection reaction) is very slow, etc.
Although many researchers try hard to change the reaction characteristics of light-burned magnesia, such as using the reaction of light-burned magnesia and water under heating conditions, because the crystalline structure of light-burned magnesia leads to many solid precipitates, this problem has not been solved. solve

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Natural magnesite MgCO 3 Calcined at a high temperature of 850°C to 1000°C for 4 to 5 hours, CO 2 After evaporation, light burnt magnesium (MgO) is obtained.

Embodiment 2

[0026] To belt 15m 3 Add 10m 3 The water was heated to 50°C with steam while stirring, then the steam was stopped, and 150kg of sodium hydroxide was added to the reaction tank. At this time, the pH of the mixed solution was 10.5. After fully dissolving, add the lightly calcined solution prepared in Example 1. Magnesium 4000kg, after mixing and stirring for 20 to 30 minutes, when the temperature of the reaction tank reaches 100°C, stop heating, and react naturally at this temperature for 2 to 3 hours, after the reaction is completed, cool to obtain the magnesium hydroxide solution as the product , its concentration is 35wt%, and the yield is 100%.

Embodiment 3

[0028] To belt 15m 3 Add 10m 3 The water was heated to 50°C with steam while stirring, then the steam was stopped, and 200kg of sodium hydroxide was added to the reaction tank. After fully dissolving, the pH of the mixed solution was 12, and then 4000kg of light-burned magnesium prepared in Example 1 was added, mixed and stirred After 20 to 30 minutes, when the temperature of the reaction tank reaches 80°C, stop heating, and react naturally at this temperature for 2 to 3 hours. After the reaction finishes, cool to obtain the magnesium hydroxide solution as the product, and its concentration is 35 wt%, the yield is 100%.

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Abstract

The invention relates to a method for synthesizing active magnesium hydroxide, which employs cheap magnesite as raw material. Obtaining caustic calcined magnesite after calcining, and then neutralizing the caustic calcined magnesite with water under the circumstance of alkali agent or high-molecular agent to synthesize magnesium hydroxide with low viscosity, high activity, lastly concentration of the magnesium hydroxide reaches 35%.

Description

technical field [0001] The invention relates to a synthesis method of magnesium hydroxide, in particular to a method for synthesizing active magnesium hydroxide using magnesite. Background technique [0002] In order to prevent environmental pollution, limestone method, sodium hydroxide method, natural magnesium sulfate method, etc. are usually used in the existing flue gas desulfurization and drainage neutralization processes. But all there is shortcoming in these methods, or there are too many subsidiary products, or cost is too high. [0003] Lightly burned magnesium (MgO) refers to magnesite as raw material, at a temperature of 750 ~ 1100 ℃, after being fired in a reflection kiln fluidized furnace, the magnesium oxide powder is finely ground. It has stable quality, high purity and good activity. , can be widely used in refractory materials, chemical industry, building materials, papermaking and animal husbandry and other industries. The output of light burned magnesium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/14C04B2/10
Inventor 李淑荣
Owner 李淑荣
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