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Method for preparing hexagonal flaky flame-retardant magnesium hydroxide from natural hydromagnesite

A technology of hexagonal flakes and magnesium hydroxide, applied in the direction of magnesium hydroxide, can solve the problems of cumbersome methods, high cost, unfriendly environment, etc., and achieve the effect of reasonable technical route, low production cost and high industrial value

Pending Publication Date: 2021-10-26
GREEN IND INNOVATION RES INST OF ANHUI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a method for preparing hexagonal flake-shaped flame-retardant magnesium hydroxide from natural hydromagnesite, so as to solve the cumbersome, high-cost, and environmentally-friendly methods of producing magnesium hydroxide flame retardants in the prior art. friendly questions

Method used

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  • Method for preparing hexagonal flaky flame-retardant magnesium hydroxide from natural hydromagnesite
  • Method for preparing hexagonal flaky flame-retardant magnesium hydroxide from natural hydromagnesite
  • Method for preparing hexagonal flaky flame-retardant magnesium hydroxide from natural hydromagnesite

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Experimental program
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Effect test

Embodiment 1

[0042] The natural hydromagnesite is crushed and sieved, and the sieved hydromagnesite is weighed and calcined at 600°C for 2 hours, the heating rate is 10°C / min, and the activated magnesium oxide obtained after the hydromagnesite is completely decomposed is sieved, Using activated magnesia as the raw material and deionized water as the solvent, ultrasonically disperse for 15 minutes to prepare a magnesia suspension with a slurry concentration of 10%. Put the magnesia suspension into a closed heating device and heat it at a constant temperature of 140°C After 4 hours, the stirring speed was 300 rpm. After the reaction was completed, the product was naturally cooled to room temperature, and the product was filtered, washed and dried to obtain hexagonal flaky magnesium hydroxide. Product 1 was obtained. Product XRD and SEM pictures such as figure 1 , 2 shown.

[0043] Compared with the magnesium hydroxide crystal PDF standard card, it can be seen that the product has high pur...

Embodiment 2

[0045] The natural hydromagnesite is crushed and sieved, and the sieved hydromagnesite is weighed and calcined at 800°C for 2 hours, the heating rate is 10°C / min, and the activated magnesium oxide obtained after the hydromagnesite is completely decomposed is sieved, Using activated magnesia as raw material and deionized water as solvent, ultrasonically disperse for 15 minutes to prepare a magnesia suspension with a slurry concentration of 10%. Put the magnesia suspension into a closed heating device and heat it at a constant temperature of 160°C After 4 hours, the stirring speed was 300 rpm. After the reaction was completed, the product was naturally cooled to room temperature, and the product was filtered, washed and dried to obtain hexagonal flaky magnesium hydroxide. Product 2 was obtained. Product XRD and SEM pictures such as image 3 , 4 shown.

[0046] Compared with the magnesium hydroxide crystal PDF standard card, it can be seen that the product has a high purity. F...

Embodiment 3

[0048] The natural hydromagnesite is crushed and sieved, and the sieved hydromagnesite is weighed and calcined at 800°C for 2 hours, the heating rate is 10°C / min, and the activated magnesium oxide obtained after the hydromagnesite is completely decomposed is sieved, Using activated magnesia as raw material and deionized water as solvent, ultrasonically disperse for 15 minutes to make a magnesia suspension with a slurry concentration of 10%, put the magnesia suspension into a closed heating device, and heat it at a constant temperature of 180°C After 4 hours, the stirring speed was 300 rpm. After the reaction was completed, the product was naturally cooled to room temperature, and the product was filtered, washed and dried to obtain hexagonal flaky magnesium hydroxide. Product 3 was obtained. Product XRD and SEM pictures such as Figure 5 , 6 shown.

[0049] Compared with the magnesium hydroxide crystal PDF standard card, it can be seen that the product has high purity. From...

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Abstract

The invention discloses a method for preparing hexagonal flaky flame-retardant magnesium hydroxide from natural hydromagnesite. The method comprises the following steps of S1, crushing and screening the natural hydromagnesite, S2, calcining the crushed and screened natural hydromagnesite to obtain active magnesium oxide, S3, screening the active magnesium oxide, S4, preparing a magnesium oxide suspension by taking active magnesium oxide as a raw material and deionized water as a solvent, S5, putting the magnesium oxide suspension into a closed heating device for heating reaction to obtain a solution, and S6, taking out the solution, naturally cooling to room temperature to obtain a product, and filtering, washing and drying the product to obtain the hexagonal flaky magnesium hydroxide. The hexagonal flaky flame-retardant magnesium hydroxide with good dispersity and regular morphology can be obtained without adding any other raw materials or auxiliaries in the process of the method, and the method has the advantages of low raw material cost, simplicity in operation, high product purity and the like.

Description

technical field [0001] The invention relates to the field of magnesium hydroxide preparation methods, in particular to a method for preparing hexagonal flake flame-retardant magnesium hydroxide from natural hydromagnesite. Background technique [0002] The chemical formula of natural hydromagnesite is 4MgCO 3 ·Mg(OH) 2 4H 2 O, is a carbonate mineral with white texture and low impurity content. Hydromagnesite has the following advantages: (1) Rich in reserves, there are many deposits in the salt lake area of ​​the Qinghai-Tibet Plateau in my country; (2) High magnesium content, among the currently proven magnesium-containing non-metallic ores, the magnesium content of hydromagnesite It ranks fourth; (3) The calcined products are environmentally friendly, and the calcined products are mainly magnesium oxide, carbon dioxide and water, which are environmentally friendly products. Therefore, hydromagnesite is a natural high-quality mineral resource for the preparation of magne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/16C04B2/10C09K21/02
CPCC01F5/16C04B2/102C09K21/02C01P2004/22C01P2004/62C01P2004/61C01P2002/74
Inventor 刘志启焦玲丽赵鹏程代建国周自圆李娜
Owner GREEN IND INNOVATION RES INST OF ANHUI UNIV
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