Method for preparing ultra-low bulk density magnesium oxide

An ultra-low stack, magnesium oxide technology, applied in magnesium oxide and other directions

Active Publication Date: 2014-05-21
厦门点石新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] There is no relevant report about the preparation of ultra-low bulk density magnesium oxide in literature and patents

Method used

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  • Method for preparing ultra-low bulk density magnesium oxide
  • Method for preparing ultra-low bulk density magnesium oxide
  • Method for preparing ultra-low bulk density magnesium oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Prepare 0.5mol / L magnesium nitrate aqueous solution and 1mol / L sodium hydroxide solution. At room temperature, use a syringe pump to drop the magnesium nitrate solution into the sodium hydroxide solution at a speed of 50ml / h, and the stirring speed is 500r / min. Wash the obtained white precipitate with deionized water, centrifuge, wash the white precipitate obtained by centrifugation twice with ethanol, then add the ethanol homogenate of the obtained precipitate into a supercritical drying kettle, heat the kettle to 60°C, and then pass it into Supercritical carbon dioxide, maintain the pressure in the kettle at 15MPa, open the vent valve, and adjust the CO 2 Flow rate is 15L / h, runs 1h, takes out gained magnesium hydroxide white powder, and its bulk density is 0.0327g / ml. The resulting white powder was calcined to obtain magnesium oxide powder with a bulk density of 0.0342 g / ml.

Embodiment 2

[0026] Prepare 0.5mol / L magnesium nitrate aqueous solution and 1mol / L sodium hydroxide solution, take 50ml of sodium hydroxide solution and heat it to 100°C in a water bath, add the magnesium nitrate solution dropwise to the sodium hydroxide solution at a speed of 200ml / h with a syringe pump , the stirring speed is 500r / min, the white precipitate obtained is washed with deionized water, centrifuged, the white precipitate obtained by centrifugation is washed twice with ethanol, and then the ethanol homogenate of the obtained precipitate is added to a supercritical drying kettle, and the The kettle was heated to 60°C, and then supercritical carbon dioxide was introduced to maintain the pressure in the kettle at 15MPa, and the vent valve was opened to adjust the CO 2 Flow rate is 30L / h, runs 1h, takes out gained magnesium hydroxide white powder, and its bulk density is 0.0244g / ml. The resulting white powder was calcined to obtain magnesium oxide with a bulk density of 0.0284 g / ml...

Embodiment 3

[0028] Prepare a 1.0mol / L magnesium chloride aqueous solution and a 2.0mol / L sodium hydroxide solution, take 25ml of the sodium hydroxide solution and heat it in a water bath to 100°C, and add the magnesium nitrate solution dropwise to the sodium hydroxide solution at a rate of 400ml / h with a syringe pump , the stirring speed is 500r / min, the white precipitate obtained is washed with deionized water, centrifuged, the white precipitate obtained by centrifugation is washed twice with ethanol, and then the ethanol homogenate of the obtained precipitate is added to a supercritical drying kettle, and the The kettle was heated to 60°C, and then supercritical carbon dioxide was introduced to maintain the pressure in the kettle at 15MPa, and the vent valve was opened to adjust the CO 2 Flow rate is 30L / h, run 1.5h, take out the white powder of magnesium hydroxide obtained, and its bulk density is 0.0335g / ml. The resulting white powder was calcined to obtain magnesium oxide with a bulk...

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Abstract

The invention discloses a method for preparing ultra-low bulk density magnesium oxide, and relates to nano magnesium oxide. The method comprises the following steps: preparing a soluble magnesium salt solution and a sodium hydroxide water solution; adding the soluble magnesium salt solution to the sodium hydroxide water solution at a constant speed under agitation; washing, centrifuging or filtering the obtained white sediment after reaction is ended; and soaking with an organic solvent, protecting holes and drying; sintering the dried white ultra-low bulk density magnesium hydrate powder, so as to obtain the ultra-low bulk density magnesium oxide. By adopting the prepared ultra-low bulk density magnesium oxide, the bulk density is smaller than 0.1g/ml, especially smaller than 0.04g/ml, and the ultra-low bulk density magnesium oxide is applicable to being used as an adsorbent, a catalyst and a catalyst carrier, can be applied to an inorganic fire retardant, flue gas desulfurization in environmental protection, deammoniation and dephosphorization in wastewater treatment, and has broad application prospects in the aspects of acid rain and soil management, food and feed additives, oil additives, agricultural magnesium fertilizers, cigarette paper smoke-suppression coatings and biological and pharmaceutical preparations, and in the fields such as ceramics, paints and medicines, microelectronics.

Description

technical field [0001] The invention relates to nanometer magnesium oxide, in particular to a method for preparing magnesium oxide with ultra-low bulk density. Background technique [0002] Nano-magnesium oxide is a new type of multifunctional inorganic material, which has special functions in thermal, optical, electrical, mechanical and chemical aspects different from bulk materials due to its fine particle size. Due to its low dielectric constant and high thermal expansion coefficient, nano-magnesium oxide has important application value in the manufacture of microwave and optoelectronic nano-components. Magnesium oxide is widely used as a catalyst and carrier because of its weak alkalinity. At the same time, due to the existence of a large number of active sites such as defects, edges, corners, and steps on the surface of magnesium oxide, it can be used as an adsorbent for toxic and harmful gases, metal ions, and compounds containing chlorine and phosphorus. The low-tem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/02
Inventor 李军张登王宏涛苏玉忠洪燕珍
Owner 厦门点石新材料有限公司
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