Simple nanometer magnesium oxide preparation method

A kind of nano-magnesium oxide, a simple technology, applied in the direction of magnesium oxide, nanotechnology, nanotechnology, etc., can solve the problem of whether the powder particle size is large or not, and achieve the effect of easy process control, uniform product particle size distribution, and simple process.

Inactive Publication Date: 2014-04-23
CHANGCHUN UNIV OF TECH
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  • Claims
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Problems solved by technology

[0005] The above method mainly has the following deficiencies: after the dolomite is calcined and digested, some will add magnesium chloride to separate calcium and magnesium, some use inorganic acid to separate calcium and magnesium through a two-step method, and some are obtained by carbonization after digestion. The pyrolysis product of magnesium bicarbonate solution (heavy magnesium water) needs to be mechanically milled and then calcined to obtain nano-magnesium oxide. Although some are prepared high-purity magnesium oxide, the powder particle size is large and not nano-scale

Method used

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Embodiment 1

[0035] Take 1000g of crushed dolomite with a particle size of about 1-5mm, put it into a muffle furnace and calcinate at 950°C for 3 hours, grind it into powder after cooling, add 5 liters of distilled water to make a slurry, heat it to 60°C and keep Stirring was continued at this temperature for 50 minutes, and after cooling to room temperature, CO 2 gas, CO 2 The flow rate was 10 mL / min. When the slurry pH value is 7, stop feeding CO 2 Gas, the product is subjected to solid-liquid separation, and the collected liquid is magnesium bicarbonate solution (heavy magnesium water)①; Take 200mL of magnesium bicarbonate solution, add 0.3 g of dispersant polyethylene glycol 1000, stir thoroughly for 30 minutes, put Stand still and heat in a water bath at 80°C for 45 minutes, then filter and collect the solid product (that is, solid basic magnesium carbonate) ②; put the obtained solid product into a muffle furnace for calcination, the calcination temperature is controlled at 500°C, a...

Embodiment 2

[0037]Take magnesium bicarbonate solution①100mL, add 0.3g of polyethylene glycol 200, stir thoroughly for 30 minutes, put it in a water bath at 80°C and heat it for 60 minutes, then filter and collect the solid product (basic magnesium carbonate); put the obtained solid product in Put it into a muffle furnace for calcination, the calcination temperature is controlled at 500° C., and the calcination time is 50 minutes to obtain a nano-magnesia product with an average particle size of 70 nm.

Embodiment 3

[0039] Take 200 mL of magnesium bicarbonate solution ①, add 0.3 g of polyethylene glycol 500, stir thoroughly for 30 minutes, put it in a water bath at 80°C and heat it for 50 minutes, then filter and collect the solid product (basic magnesium carbonate); put the obtained solid product in Put it into a muffle furnace for calcination, the calcination temperature is controlled at 500° C., and the calcination time is 40 minutes to obtain a nano-magnesia product with an average particle size of 60 nm.

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Abstract

The present invention relates to a simple nanometer magnesium oxide preparation method, which comprises: crushing dolomite, calcining at a temperature of 950-1200 DEG C, digesting the product at a temperature of 50-90 DEG C after calcining, introducing CO2 to the digested product at a room temperature to carry out a carbonization reaction, stopping CO2 introduction when the pH value of the system is 7-9, carrying out solid-liquid separation on the reaction product to obtain a magnesium bicarbonate solution (Mg(HCO3)2 solution), adding a dispersant to the magnesium bicarbonate solution according to a certain ratio, completely and uniformly stirring for 20-60 min, carrying out pyrolysis for 30-90 min at a temperature of 80-100 DEG C until the solid basic magnesium carbonate is precipitated, and calcining the solid basic magnesium carbonate for 30-60 min at a temperature of 450-750 DEG C to obtain the nanometer magnesium oxide with an average particle size of 50 nm. According to the present invention, the used raw materials are abundant, the price is low, the process is simple, characteristics of safety and no pollution are provided, the process is easy to control, the nanometer magnesium oxide prepared by using the method has a characteristic of uniform particle size, and the method is suitable for industrial development of nanometer magnesium oxide production.

Description

technical field [0001] The invention relates to the technical field of preparation of inorganic nanomaterials, in particular to a new method for adding a dispersant to a magnesium bicarbonate solution prepared from dolomite, followed by pyrolysis, drying, and calcining to obtain nanoscale magnesium oxide. Background technique [0002] Nanoscale magnesium oxide has the quantum size effect, surface effect and macroscopic tunnel effect of nanomaterials, and it has played a special function different from bulk materials in catalysis, optics, mechanics, chemical industry, magnetism, etc., and has a very broad application prospect. Nano-scale magnesium oxide can be used as flame retardant, catalyst, binder, additive, neutralizer, insulating filler, high temperature dehydrating agent, electrical insulator material, adsorbent, bactericide, radar absorbing material, in electronics, ceramics, It is widely used in the fields of oil products, catalysis, coatings, environmental protectio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/02B82Y30/00
Inventor 王元瑞李贞玉朱薇王树江乔迁
Owner CHANGCHUN UNIV OF TECH
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