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Method for preparing flaky monodisperse nano-magnesium hydroxide from magnesite

A nano-magnesium hydroxide and magnesite technology, applied in the field of mineral processing, can solve the problems of affecting the chroma of magnesium hydroxide, low flame retardant grade magnesium hydroxide, and can only reach the micron level, etc., to shorten the hydration time, Reduced acidification time, low cost effect

Active Publication Date: 2016-10-12
徐艳涛
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the requirements for the purity of magnesite are relatively high, and the purity of magnesite generally must reach more than 96%. If iron is contained in magnesite, it will seriously affect the chroma of magnesium hydroxide and reduce the product quality; secondly, the prepared The particle size of magnesium hydroxide is relatively coarse and has no fixed shape, and can only reach the micron level
Therefore, this process can only use high-quality magnesite as raw material to prepare lower-quality flame-retardant magnesium hydroxide products

Method used

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  • Method for preparing flaky monodisperse nano-magnesium hydroxide from magnesite
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  • Method for preparing flaky monodisperse nano-magnesium hydroxide from magnesite

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Experimental program
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Effect test

Embodiment 1

[0028] The first step: magnesite calcined water-soluble

[0029] Crush the magnesite to less than 9mm, and then calcining after crushing, the calcining temperature is 630°C, and the calcining time is 3 hours to obtain magnesium oxide powder, weigh 28g of magnesium oxide powder, add it to the stirring tank, and add 18ml of water, stir for 0.3min.

[0030] The second step: Grinding and acidifying magnesium oxide powder slurry

[0031] Transfer the stirred magnesium oxide powder slurry to an acidified stirring mill for grinding. After grinding for 2 minutes, add hydrochloric acid to the acidified stirring mill to acidify the magnesium oxide powder. The acidification time is 1 minute, and the magnesium oxide powder slurry is added from the bottom to acidify In the stirred mill, hydrochloric acid is added into the acidified stirred mill from the middle, and the acidified slurry is discharged from the upper end of the acidified stirred mill.

[0032] The third step: Acidification ...

Embodiment 2

[0042] The first step: calcination of magnesite

[0043] Same as the first step of Example 1.

[0044] The second step: Grinding and acidifying magnesium oxide powder slurry

[0045] Same as the second step of Example 1.

[0046] The third step: Acidification and impurity removal of magnesium oxide powder slurry

[0047] During the acidification process, add 140ml of hydrochloric acid with a mass percentage concentration of 23% from the middle to acidify the magnesium oxide powder. This process requires insufficient hydrochloric acid and excessive magnesium oxide powder. Brown-red precipitates appear in the slurry and are discharged from the upper end of the acidification stirring mill. The slurry is filtered to obtain filtrate and filter residue, impurities such as iron, manganese, calcium and excessive magnesium oxide powder enter the solid filter residue, and the filtrate is the magnesium chloride solution after impurity removal.

[0048] Step Four: Preparation of Activa...

Embodiment 3

[0056] The first step: calcination of magnesite

[0057] Same as the first step of Example 1.

[0058] The second step: Grinding and acidifying magnesium oxide powder slurry

[0059] Same as the second step of Example 1.

[0060] The third step: Acidification and impurity removal of magnesium oxide powder slurry

[0061] During the acidification process, add 149ml of hydrochloric acid with a mass percentage concentration of 21.5% from the middle to acidify the magnesium oxide powder. This process requires insufficient hydrochloric acid and excessive magnesium oxide powder. Brown-red precipitates appear in the slurry and are discharged from the upper end of the acidification stirring mill. The slurry is filtered to obtain filtrate and filter residue, impurities such as iron, manganese, calcium and excessive magnesium oxide powder enter the solid filter residue, and the filtrate is the magnesium chloride solution after impurity removal.

[0062] Step Four: Preparation of Acti...

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Abstract

The present invention relates to a kind of method that uses magnesite as raw material to prepare flaky monodisperse nano-magnesium hydroxide, specifically, magnesite is calcined, and the magnesite powder and magnesia powder with different activity of each component produced by calcining Make a solution with a certain concentration and stir it, then add it to the acidification stirring mill for grinding and acidification. By controlling the amount of magnesium oxide powder and hydrochloric acid and the acidification reaction conditions, the purification and impurity removal of magnesium oxide powder is realized. By controlling the oxidation of the hydrated magnesium hydroxide precursor Magnesium activity and particle size as well as hydration conditions, prepared flake nano-magnesium hydroxide. The hydrochloric acid, water and additives in the present invention can be recycled, and are environmentally friendly and low in cost. This process can revitalize existing magnesite resources and realize high value-added processing and utilization of resources.

Description

technical field [0001] The invention relates to a deep processing of magnesite and a method for preparing sheet-like monodisperse nano-magnesium hydroxide, which belongs to the technical field of mineral processing. Background technique [0002] The magnesium hydroxide material used as a flame retardant has dual functions of flame retardancy and smoke suppression. However, the addition amount generally needs to reach more than 40% to achieve the ideal flame retardant effect. Therefore, without affecting the mechanical properties of the material, increasing the amount of magnesium hydroxide requires fine particle size, high purity, and surface polarity. Small and uniform shape, easy to add to the material. For this reason, most of the previous studies used normal temperature synthesis, hydrothermal treatment and surface modification, three-step method to produce flame-retardant magnesium hydroxide. This makes the production process of magnesium hydroxide more complicated, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/16B82Y40/00
CPCB82Y40/00C01F5/16C01P2004/24C01P2004/64C01P2006/80
Inventor 白丽梅姜玉芝李萌朱一民郭爱红张勇邢智博聂轶苗邓玉芬
Owner 徐艳涛
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