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Basic magnesium carbonate and preparation method thereof

A technology of magnesium carbonate and magnesium carbonate sheet layer, applied in the direction of magnesium carbonate, can solve the problems of cost increase and achieve the effect of improving purity and low reaction temperature

Active Publication Date: 2016-09-14
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of using the carbonization method to prepare basic magnesium carbonate, it is usually necessary to add various carbonization agents in the reaction system, such as sodium carbonate, potassium carbonate, sodium bicarbonate, ammonium carbonate and ammonium bicarbonate, so it is inevitable or The introduction of impurity elements, such as Na + , K + , in order to avoid the introduction of impurities, the preparation equipment and environmental requirements should be improved, which will inevitably lead to an increase in cost

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  • Basic magnesium carbonate and preparation method thereof
  • Basic magnesium carbonate and preparation method thereof
  • Basic magnesium carbonate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) 18.52g MgCl 2 ·6H 2 O was dissolved in 350ml of pH=10.0 aqueous solution, and 35ml of absolute ethanol was added to form a transparent MgCl 2 alkaline aqueous solution;

[0042] (2) Pass high-purity carbon dioxide gas into MgCl 2 In aqueous solution, control the feed rate to be about 0.5L / min;

[0043] (3) heating the reaction solution to 60 degrees, reacting for 2h;

[0044] (4) After the reaction, the obtained sample was filtered, washed with deionized water until neutral, washed with absolute ethanol, and dried at 50-80 degrees for 10 hours.

[0045] The obtained samples were subjected to powder X-ray diffraction analysis (XRD, such as figure 1 ) and Field Emission-Scanning Electron Microscopy (FE-SEM, such as figure 2 ) analysis and characterization. Such as figure 1 As shown, since there are representatives (100), (011), ( 1 02) and the appearance of the characteristic peaks of (022) crystal face, prove that this precipitate is basic magnesium carbona...

Embodiment 2

[0047] (1) 18.52g MgCl 2 ·6H 2 O dissolves in 385ml of pH=10.0 aqueous solution to form transparent MgCl 2 alkaline aqueous solution;

[0048] (2) Pass high-purity carbon dioxide gas into MgCl 2 In aqueous solution, control the feed rate to be about 0.5L / min;

[0049] (3) heating the reaction solution to 60 degrees, reacting for 2h;

[0050](4) After the reaction, the obtained sample was filtered, washed with deionized water until neutral, washed with absolute ethanol, and dried at 50-80 degrees for 10 hours.

[0051] The only difference between Example 2 and Example 1 is whether absolute ethanol is added in the reaction solution. Such as image 3 It can be seen that when dehydrated alcohol is not added in the reaction system, the resulting white precipitate is still basic magnesium carbonate powder. But compare with figure 1 It can be seen that when there is no dehydrated alcohol in the reaction system, the crystallinity of the gained basic magnesium carbonate powder ...

Embodiment 3

[0053] (1) 18.52g MgCl 2 ·6H 2 O was dissolved in 350ml of pH=10.0 aqueous solution, and 25ml of absolute ethanol and 10ml of deionized water were added to form a transparent MgCl 2 alkaline aqueous solution;

[0054] (2) Pass high-purity carbon dioxide gas into MgCl 2 In aqueous solution, control the feed rate to be about 0.5L / min;

[0055] (3) heating the reaction solution to 60 degrees, reacting for 2h;

[0056] (4) After the reaction, the obtained sample was filtered, washed with deionized water until neutral, washed with absolute ethanol, and dried at 50-80 degrees for 10 hours.

[0057] The obtained product was subjected to XRD characterization analysis. Such as Figure 5 shown, compared figure 1 , when the addition of dehydrated alcohol in the reaction system reduces, the product obtained is still basic magnesium carbonate. And the crystal structure did not change significantly. Only when the addition of absolute ethanol decreases, the intensity ratio of basic ...

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Abstract

The invention discloses a method for preparing basic magnesium carbonate. The method comprises the following steps: dissolving a soluble magnesium salt or a hydrate thereof in water, adding an organic solvent to obtain a magnesium salt solution, introducing carbon dioxide to the obtained magnesium salt solution, heating the carbon dioxide introduced magnesium salt solution to obtain a solid and liquid mixture, and separating the solid and liquid mixture to obtain a solid which is basic magnesium carbonate. Highly pure carbon dioxide is introduced to a reaction system as a carburization agent, so the reaction temperature is low, and introduction of various impurity elements is reduced, thereby the purity of basic magnesium carbonate is improved. Morphology-(flower shape and carpenterworm shape)-and-crystallinity-controllable highly-pure basic magnesium carbonate powder is prepared through controlling the following reaction conditions: temperature, time, and addition of anhydrous ethanol.

Description

technical field [0001] The invention belongs to the field of novel material preparation, and in particular relates to a method for preparing basic magnesium carbonate with micro-nano structure by using carbon dioxide. Background technique [0002] As an important inorganic chemical product, basic magnesium carbonate can not only be used as a raw material for the preparation of high-purity magnesia, magnesium salt and other products, but also can be used as an additive and modifier for chemical products such as rubber, medicine, and insulating materials. Its application prospects Very broad. However, the realization of these potential applications is closely related to factors such as the purity, morphology and crystallization degree of basic magnesium carbonate. For example, when basic magnesium carbonate is used as high-purity magnesium oxide material, CaO and B 2 o 3 The content is one of the important indicators to evaluate the quality of the product. As for electroni...

Claims

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Application Information

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IPC IPC(8): C01F5/24
CPCC01F5/24C01P2002/72C01P2004/03C01P2004/30C01P2004/61
Inventor 海春喜周园任秀峰李松申月曾金波董欧阳李翔张丽娟
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI