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Clean preparation method for basic magnesium carbonate

A magnesium carbonate, basic technology, applied in magnesium carbonate and other directions, can solve the problems of narrow application range, waste of mineral resources, low added value of products, etc., to achieve the effect of protecting the environment and saving water resources

Inactive Publication Date: 2011-01-05
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Brucite is rich in reserves in my country, but it is only used after primary processing at present. The added value of the product is low, the application range is narrow, and it has not been effectively utilized, which greatly wastes mineral resources.

Method used

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  • Clean preparation method for basic magnesium carbonate
  • Clean preparation method for basic magnesium carbonate
  • Clean preparation method for basic magnesium carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Mix 46.7g of natural mineral brucite with a particle size of about 400 μm and 731.6 g of deionized water to obtain 0.8 L of brucite slurry with a solid content of 6%, grind it with a colloid mill for 20 minutes to make the particle size less than 45 μm, and then place In the high-pressure reactor, 0.35Mpa of CO 2 Under pressure, heat up to 170°C under stirring conditions, react for 5 hours, stop ventilation and heating, centrifuge the obtained product after cooling, and directly dry at 50°C for 10 hours to obtain basic magnesium carbonate with a particle size of micron.

[0023] The crystal structure of the sample was characterized by XRD-6000 X-ray powder diffractometer from Shimadzu Corporation, Japan. figure 1 It is the XRD spectrogram of the sample gained in Example 1. As can be seen from the figure, the characteristic peaks in the standard magnesium basic carbonate XRD spectrogram include 2θ=9.6 °, 13.8 °, 15.2 °, and 30.8 °. There is a sharp peak shape of each ch...

Embodiment 2

[0025] Mix 46.7g of natural mineral brucite with a particle size of about 200μm and 731.6g of deionized water to obtain 0.8L of brucite slurry with a solid content of 6%, grind it with a ball mill for 15min to make the particle size less than 10μm, and then place In the high-pressure reactor, 0.78Mpa of CO 2 Under pressure, heat up to 100°C under stirring conditions, react for 3 hours, stop ventilation and heating, centrifuge the obtained product after cooling, and directly dry at 160°C for 2 hours to obtain basic magnesium carbonate with a particle size of micron.

[0026] The samples were qualitatively analyzed by a Vector22 Fourier transform infrared spectrometer from Bruker, Germany. The Fourier transform spectrum (FT-IR) spectrogram of sample obtained by embodiment 2 is as follows figure 2 shown, of which 3450cm -1 and nearby 3513cm -1 The vibration peak is caused by H 2 O molecule and OH - Caused by stretching and bending vibrations of ions, indicating that the pro...

Embodiment 3

[0032] The synthetic magnesium hydroxide of 24.5g particle diameter about 10 μm is mixed with 790.4g deionized water, obtains 0.8L solid content and is the magnesium hydroxide slurry of 3%, grinds 15min with colloid mill, makes its particle diameter less than 0.5 μm, then Placed in a high-pressure reactor and fed with 0.35Mpa of CO 2 Under pressure, heat up to 60°C under stirring conditions, react for 5 hours, stop ventilation and heating, and after cooling, centrifuge the obtained product, and directly dry at 80°C for 8 hours to obtain basic magnesium carbonate with a particle size of micron.

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Abstract

The invention relates to a clean preparation method for basic magnesium carbonate, which prepares the basic magnesium carbonate by taking natural mineral brucite or synthesized magnesium hydroxide as raw materials and by performing the atom economic reaction of the raw material and CO2. All atoms in the raw materials participate in the reaction, and a target product is generated; the economical efficiency of the atoms is 100 percent; and thus, the reaction is a typical atom economic reaction. A reaction process avoids using raw materials such as dolomite, magnesite or brine, and sodium carbonate which are usually used by the conventional synthesis method, so that a product has no impurities, the pure product can be directly obtained without drying, a washing link is removed, a great amount of water source is saved, and the environment is protected.

Description

technical field [0001] The invention relates to a method for preparing basic magnesium carbonate by using brucite or synthetic magnesium hydroxide as a raw material and adopting a clean process of atomic economic reaction, which belongs to the field of preparation of inorganic non-metallic materials. technical background [0002] Basic magnesium carbonate is a compound of magnesium carbonate and magnesium hydroxide, its molecular formula is xMgCO 3 ·yMg(OH) 2 ·zH 2 O, where the value of x is between 3-5, the value of y is approximately 1, and the value of z is between 0-8, which changes slightly with the change of production conditions. Basic magnesium carbonate is an important inorganic magnesium compound material. In addition to being used as a raw material for the preparation of high-purity magnesia and magnesium salt series products, it can also be used in rubber, medicine, insulating materials, dental special agents, advanced glass, food and various Additives and mod...

Claims

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Application Information

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IPC IPC(8): C01F5/24
Inventor 林彦军刘海青韦强钟凯段雪
Owner BEIJING UNIV OF CHEM TECH
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