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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: 2006-10-25
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 in the liquid phase reaction stage, but the agglomeration is still very serious when the powder is dried by ordinary drying methods

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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Embodiment Construction

[0027] (1) 101.5 grams of magnesium chloride hexahydrate, 120.0 grams of urea and 250 grams of water are put into a three-necked flask of 1000 milliliters, and 1.0 grams of polyethylene glycol-1000 and 0.8 grams of polyethylene glycol-400 are added simultaneously, and the water bath is heated to 363K, React for 4 hours, age for 5 hours, filter with suction, wash with deionized water until no chloride ion is detected by silver nitrate solution.

[0028] (2) The precipitate was washed 10 times with absolute ethanol, then soaked for 24 hours, filtered with suction, and washed 6 times to ensure that the water was completely replaced.

[0029] (3) The product obtained in (2) is put into a supercritical dryer, and the CO from the steel cylinder 2 After the gas is liquefied by the condenser, pressurized by the high-pressure pump and heated by the heater, the gas reaches a supercritical state, and maintains a constant temperature and pressure at 16MPa and 333K for 3 hours. When the et...

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Abstract

A uniform precipitation-supercritical carbon dioxide drying method for preparing nano magnesium oxide belongs to the technical field of nano material preparation. The main content is to prepare magnesium hydroxide precipitation by uniform precipitation method in aqueous solution, replace the water in the precipitation with ethanol, and then use supercritical CO 2 The ethanol in the precipitate is removed by drying, and the ethanol is separated and recovered through the separator, and the CO 2 Can be recycled. The dried magnesium hydroxide is calcined at high temperature to obtain nano-sized MgO powder. The method solves the problem of agglomeration during drying of the prepared nano-powder, and has a simple operation process and is easy to realize industrialization. Nano-magnesium oxide has broad application prospects in ceramics, enamel, medicine, cosmetics, paint, paper and aviation, military, quantum devices, microelectronics and other fields.

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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Patent Type & Authority Patents(China)
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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