Method of preparing nanometer magnesium oxide using uniform precipitation-supercritical carbon dioxide drying method

A nano-magnesium oxide, uniform precipitation technology, applied in the direction of magnesium oxide, can solve the problem of serious agglomeration, achieve good adsorption performance, lower operating temperature and pressure, and easy control

Inactive Publication Date: 2005-03-23
DALIAN UNIV OF TECH
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Problems solved by technology

When preparing nano-magnesium oxide by liquid phase method, adding an appropriate dispersant can solve the problem of agglomeration

Method used

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  • Method of preparing nanometer magnesium oxide using uniform precipitation-supercritical carbon dioxide drying method
  • Method of preparing nanometer magnesium oxide using uniform precipitation-supercritical carbon dioxide drying method
  • Method of preparing nanometer magnesium oxide using uniform precipitation-supercritical carbon dioxide drying method

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Example Embodiment

[0027] (1) Put 101.5 g of magnesium chloride hexahydrate, 120.0 g of urea and 250 g of water into a 1000 ml three-necked flask, add 1.0 g of polyethylene glycol-1000 and 0.8 g of polyethylene glycol-400 at the same time, and heat the water bath to 363K. Reaction for 4 hours, aging for 5 hours, suction filtration, and washing with deionized water until no chlorine ions are detected with silver nitrate solution.

[0028] (2) Wash the precipitate 10 times with absolute ethanol, then soak for 24 hours, filter with suction, and wash 6 times to ensure that the water is completely replaced.

[0029] (3) Put the product obtained in (2) into a supercritical dryer, the CO from the cylinder 2 After the gas is liquefied by the condenser, pressurized by the high-pressure pump and heated by the heater, it reaches the supercritical state. It is maintained at a constant temperature and pressure at 16MPa and 333K for 3 hours. When the ethanol in the filter cake is completely supercritical CO 2 Aft...

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Abstract

A process for preparing nano-magnesium oxide by uniform deposition-supercritical CO2 drying method includes such steps as preparing magnesium hydroxide deposit in aqueous solution by uniform deposition method, displacing water from the deposit by alcohol, removing alcohol from deposit by supercritical CO2 drying method, separating alcohol for recovering it, cyclic use of CO2, and calcining the dried magnesium hydroxide.

Description

technical field [0001] The invention belongs to the technical field of nano material preparation, in particular to a new process for preparing nano MgO powder. Background technique [0002] Nano-magnesium oxide is a new type of inorganic functional material, which has broad application prospects in ceramics, enamel, medicine, cosmetics, paint, paper and aviation. The combination of nano-magnesia and high polymer or other materials has good microwave absorption function. Nano-magnesium oxide can be sintered at low temperature without sintering aids to make dense fine-grained ceramics. This kind of ceramics is expected to be developed into a cutting-edge material used under high temperature and high corrosion conditions. At the same time, nano-magnesia can be used as a sintering aid and stabilizer for preparing high-quality nano-phase zirconia ceramics, alumina ceramics, and iron oxide ceramics. Nano magnesium oxide can also be used as lipolytic agent and pharmaceutical poli...

Claims

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Application Information

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IPC IPC(8): C01F5/02
Inventor 王宝和于才渊张文博张伟
Owner DALIAN UNIV OF TECH
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