Method for preparing anhydrous magnesium carbonate based on hydrothermal carbonization reaction

An anhydrous magnesium carbonate and hydrothermal carbonization technology, applied in magnesium carbonate and other directions, can solve the problems of harsh reaction environment, large crystal particle size and long reaction time, and achieve the effects of uniform particle size, good dispersion and simple equipment.

Active Publication Date: 2021-09-24
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Examples

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 anhydrous magnesium carbonate based on hydrothermal carbonization reaction. The method uses ascorbic acid as a carbon source, dissolves it in deionized water, adjusts the initial pH of the ascorbic acid aqueous solution to 5.5-14.0, and then adds magnesium salt, Under the condition that the hydrothermal reaction temperature is 120-250° C. and the hydrothermal reaction time is 1-12 hours, anhydrous magnesium carbonate powder with good dispersibility, various shapes and uniform size is prepared. Above-mentioned magnesium salt is any one in magnesium sulfate, magnesium chloride, magnesium hydroxide, magnesium oxide or magnesium acetate. The preparation method of the present invention is simple and easy to control, highly efficient and energy-saving, and does not need to introduce CO 2 As a carbon source, the shape and size of anhydrous magnesium carbonate can be adjusted by simply changing the concentration of magnesium salt or adjusting the initial pH value of ascorbic acid solution, 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 based on a 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, etc. Therefore, the pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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