Method for preparing bird-nest type monodisperse magnesium oxide

A magnesium oxide, monodisperse technology, applied in the direction of magnesium oxide, can solve the problems that affect the production and application of magnesium oxide, the shape of magnesium oxide is difficult to control, and the particle size distribution is uneven, so as to achieve easy operation, controllable shape, The effect of short reaction times

Inactive Publication Date: 2007-03-28
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, they have found that the magnesium oxide obtained by this method has the The appearance is difficult to control, the specific surface area is small, and the particle size distribution is not uniform
The existence of these problems directly affects the production and application of magnesium oxide

Method used

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  • Method for preparing bird-nest type monodisperse magnesium oxide
  • Method for preparing bird-nest type monodisperse magnesium oxide
  • Method for preparing bird-nest type monodisperse magnesium oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Weigh 16g of magnesium nitrate in a 250ml beaker, add 60-150ml of secondary deionized water, specifically 90ml, transfer it to a 500ml three-necked round bottom flask; then weigh 9g of potassium carbonate in a 250ml beaker , add 120-300ml of secondary deionized water, specifically 180ml; heat the magnesium nitrate and potassium carbonate solutions to 100°C respectively, then quickly add potassium carbonate to the magnesium nitrate solution heated in an oil bath, and stir quickly to Aging for 0.5 hour, filtering, and drying; the X-ray diffraction patterns and scanning electron microscope images of the resulting product are shown in Figures 1 and 2. It can be seen from the figure that the product is bird’s nest-shaped basic magnesium carbonate with uniform particle size distribution and controllable shape, Mg 5 (CO 3 ) 4 (OH) 2 (H 2 O) 4 .

Embodiment 2

[0024] Weigh 16g of magnesium nitrate in a 250ml beaker, add 60-150ml of secondary deionized water, specifically 90ml, transfer it to a 500ml three-necked round bottom flask; then weigh 9g of potassium carbonate in a 250ml beaker , add 120-300ml of secondary deionized water, specifically 180ml; heat the magnesium nitrate and potassium carbonate solutions to 80°C respectively, then quickly add potassium carbonate to the magnesium nitrate solution heated in the oil bath, and stir quickly evenly. Aging for 1 hour, filtering, drying, and then roasting at a high temperature of 550°C; the X-ray diffraction patterns and scanning electron microscope images of the obtained product are shown in Figure 3 and Figure 4 . It can be seen from the figure that the product is bird's nest-like MgO with uniform particle size distribution and controllable shape.

Embodiment 3

[0026] Weigh 16g of magnesium nitrate in a 250ml beaker, add 60-150ml of secondary deionized water, specifically 90ml, transfer it to a 500ml three-necked round bottom flask; then weigh 9g of potassium carbonate in a 250ml beaker , add 120-300ml of secondary deionized water, specifically 180ml;

[0027] (a) Potassium carbonate was quickly added to the magnesium nitrate solution heated in an oil bath, stirred vigorously, aged for 2 hours, filtered, dried, and then roasted at a high temperature of 600°C; the scanning electron microscope image of the obtained product is shown in Figure 5a. As can be seen from the figure, the particle size of the product is relatively small.

[0028] (b) Heating the magnesium nitrate solution to 90°C, quickly adding potassium carbonate to the magnesium nitrate solution heated in an oil bath, stirring rapidly, aging for 3 hours, filtering, drying, and then roasting at a high temperature of 700°C; the obtained product The SEM image is shown in Figu...

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Abstract

The invention relates to the preparation of magnesia, concretely a nestlike monodisperse magnesia preparing method, in a 120-140 deg.C heating system, and a water solution system, using soluble Mg salts and soluble carbonates as raw materials, producing alkali magnesium carbonates by codeposition reaction, then making high temperature baking and making it. And the method is simple to operate, the raw materials are easy to obtain, and the product has a uniform particle size and a shape easy to control.

Description

technical field [0001] The invention relates to the preparation of magnesium oxide, in particular to a preparation method of bird's nest monodisperse magnesium oxide. Background technique [0002] Magnesium oxide is the most widely used ceramic material, and it has also been used in various fields such as catalytic materials, refractory materials, paints, superconductors, and toxic waste gas treatment. Nowadays, the methods used to prepare magnesium oxide mainly include chemical vapor deposition, sol-gel method, spray-pyrolysis method, and salt decomposition method. Although these methods can be used to obtain magnesium oxide with uniform particle size and controllable morphology, they need to use expensive and highly toxic organometallic compounds as precursors, or the operation steps are cumbersome. Therefore, there is an urgent need to develop a simple method for preparing MgO with controllable morphology. [0003] Co-precipitation is a traditional method for preparing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/06
Inventor 陈吉平张智平张世刚倪余文刘中民梁鑫淼
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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