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Method for preparing special-shaped anhydrous magnesium carbonate based on hydrothermal carbonization reaction

A technology of anhydrous magnesium carbonate and hydrothermal carbonization, applied in the direction of magnesium carbonate, can solve the problems of large crystal particle size, harsh reaction environment, long reaction time, etc., and achieve the effect of uniform particle size, mild conditions and simple equipment

Active Publication Date: 2019-08-09
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally speaking, the preparation of anhydrous magnesium carbonate is mostly concentrated under high temperature and high pressure conditions, which may be determined by the characteristics of the substance itself. The existing preparation research generally has harsh reaction environments, long reaction times, and large crystal particle sizes.

Method used

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  • Method for preparing special-shaped anhydrous magnesium carbonate based on hydrothermal carbonization reaction
  • Method for preparing special-shaped anhydrous magnesium carbonate based on hydrothermal carbonization reaction
  • Method for preparing special-shaped anhydrous magnesium carbonate based on hydrothermal carbonization reaction

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Experimental program
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Effect test

Embodiment 1

[0025] Adjust the initial pH of 150mg / ml ascorbic acid aqueous solution to 8.5, add MgCl 2 As a magnesium source, control Mg 2+ The concentration was 1.0 mol / L. The above mixture was magnetically stirred for 20 minutes, then placed in a 50ml reaction kettle, and then the reaction kettle was put into an oven, and the temperature of the oven was set at 180°C. After 3 hours of reaction, the reaction kettle was naturally cooled to room temperature. The reacted mixture was centrifuged (4000rpm, 5min), the solid product was washed three times with ethanol, and dried in an oven (80°C, 12h) to obtain anhydrous magnesium carbonate powder. Depend on figure 1 It can be seen that the obtained anhydrous magnesium carbonate is a sphere with a rough surface and a diameter of about 5um.

Embodiment 2

[0027] Adjust the initial pH of 150mg / ml ascorbic acid aqueous solution to 13.5, add MgCl 2 As a magnesium source, control Mg 2+ The concentration was 1.0 mol / L. The above mixture was magnetically stirred for 20 minutes, then placed in a 50ml reaction kettle, and then the reaction kettle was put into an oven, and the temperature of the oven was set at 180°C. After 3 hours of reaction, the reaction kettle was naturally cooled to room temperature. The reacted mixture was centrifuged (4000rpm, 5min), the solid product was washed three times with ethanol, and dried in an oven (80°C, 12h) to obtain anhydrous magnesium carbonate powder. Depend on figure 2 It can be seen that the obtained anhydrous magnesium carbonate is in the shape of a hydrangea with a diameter of about 0.5-1um.

Embodiment 3

[0029] Adjust the initial pH of 150 mg / ml ascorbic acid aqueous solution to 12.5, add MgCl 2 As a magnesium source, control Mg 2+ The concentration was 2.2mol / L, the above mixture was magnetically stirred for 20min, then placed in a 50ml reaction kettle, and then the reaction kettle was put into an oven, the temperature of the oven was set at 180°C, and the reaction kettle was naturally cooled to room temperature after 3 hours of reaction. The reacted mixture was centrifuged (4000rpm, 5min), the solid product was washed three times with ethanol, and dried in an oven (80°C, 12h) to obtain anhydrous magnesium carbonate powder. Depend on image 3 It can be seen that the obtained anhydrous magnesium carbonate is in the shape of a jagged rod.

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Abstract

The invention discloses a method for preparing special-shaped anhydrous magnesium carbonate based on a hydrothermal carbonization reaction. According to the method, with ascorbic acid as a carbon source, the ascorbic acid is dissolved in deionized water, the initial pH of an ascorbic acid aqueous solution is adjusted to be 5.5-14.0, then magnesium salt is added, and under the condition that the temperature of a hydrothermal reaction is 120-250 DEG C and the time of the hydrothermal reaction is 1-12 hours, anhydrous magnesium carbonate powder which is good in dispersity, diverse in shape and even in size is prepared. The magnesium salt is one of magnesium sulfate and magnesium chloride and magnesium hydroxide and magnesium oxide and magnesium acetate. The preparation method is easy and convenient to implement, easy to control, efficient and capable of saving energy, CO2 does not need to be introduced as the carbon source, by easily changing the concentration of the magnesium salt or regulating the initial pH value of the ascorbic acid solution, the shape and size of the anhydrous magnesium carbonate can be regulated, and the obtained product is pure-phase anhydrous magnesium carbonate.

Description

technical field [0001] The invention belongs to the technical field of preparation of anhydrous magnesium carbonate micro-nano materials, and in particular relates to a method for preparing anhydrous magnesium carbonate with special morphology based on hydrothermal carbonization reaction. Background technique [0002] Anhydrous magnesium carbonate exists in nature as magnesite, MgCO 3 with FeCO 3 Complete isomorphism can be formed between them, that is, Mg in the crystal structure 2+ and Fe 2+ Due to their similar properties, they can be replaced with each other, and their crystal physical properties show a linear change trend with the amount of the two elements. The unit cell structure and chemical bonds remain unchanged, Mg 2+ with Fe 2+ They can be miscible with each other in proportion, and can form homogeneous mixtures with different contents. Natural magnesite generally contains Fe and is difficult to remove, in addition, there are impurities such as Ca, Mn, Si, ...

Claims

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Application Information

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IPC IPC(8): C01F5/24
CPCC01F5/24C01P2004/03C01P2004/32C01P2004/61
Inventor 徐世爱鲁云花
Owner EAST CHINA UNIV OF SCI & TECH
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