Magnesium oxide material and preparing method thereof

A technology of magnesium oxide and beryllium hydroxide, which is applied in the field of refractory materials, can solve the problems of lowering the softening temperature of magnesium materials under load, prone to cracks, and poor slag resistance and permeability, and achieves improved softening temperature under load, excellent corrosion resistance, and Good hydration effect

Inactive Publication Date: 2016-06-22
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, amorphous and carbon-free magnesia refractories have common disadvantages, namely: poor slag permeability, easy peeling, easy hydration, and cracks during drying, which affect the use of magnesia products. This has led to a situation where the proportion of magnesia castables is very low when castables have become the main types of monolithic refractory materials at home and abroad.
There are two main reasons for this: 1) magnesia is ...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A magnesium oxide material and a preparation method thereof. First, the mass ratio of magnesium oxide fine powder and mixed solution is 1:2, put in a mixer and mix for 0.5 to 3 hours to obtain a mixed slurry; then filter the mixed slurry and dry it at 110°C for 24 hours , to obtain a mixture block; then heat the mixture block at 1100-1300° C. for 1-3 hours, cool, and ball mill to 1-100 μm to obtain an alumina material.

[0023] The mixed solution is a mixed solution of beryllium hydroxide and oxalic acid solution, wherein the content of beryllium hydroxide is 5-10wt%, and the oxalic acid solution is 90-95wt%.

[0024] The magnesium oxide material prepared in this example is tested: MgO content ≥ 94 wt %; apparent porosity ≤ 4%.

Embodiment 2

[0026] A magnesium oxide material and a preparation method thereof. Firstly, the mass ratio of magnesium oxide fine powder and mixed solution is 1:2, and mixed in a mixer for 3 to 6 hours to obtain a mixed slurry; then the mixed slurry is filtered and dried at 110°C for 24 hours , to obtain a mixture block; then heat the mixture block at 1100-1200° C. for 3-5 hours, cool, and ball mill to 100-150 μm to obtain an alumina material.

[0027] The mixed solution is a mixed solution of beryllium hydroxide and oxalic acid solution, wherein: the beryllium hydroxide is 10-20 wt%, and the oxalic acid solution is 80-90 wt%.

[0028] The magnesium oxide material prepared in this example is tested: MgO content ≥ 95 wt %; apparent porosity ≤ 3%.

Embodiment 3

[0030] A magnesium oxide material and a preparation method thereof. Firstly, the mass ratio of magnesium oxide fine powder and mixed solution is 1:2, and mixed in a mixer for 6-8 hours to obtain a mixed slurry; then the mixed slurry is filtered and dried at 110°C for 24 hours , to obtain a mixture block; then heat the mixture block at 1200-1300° C. for 5-6 hours, cool, and ball mill to 1-200 μm to obtain an alumina material.

[0031] The mixed solution is a mixed solution of beryllium hydroxide and oxalic acid solution, wherein: the beryllium hydroxide is 20-30 wt%, and the oxalic acid solution is 70-80 wt%.

[0032] The magnesium oxide material prepared in this example is tested: MgO content ≥ 98wt%; apparent porosity ≤ 2%.

[0033] Compared with the prior art, this specific embodiment has the following positive effects:

[0034] During the blending process, the magnesium oxide material prepared in this specific embodiment wraps the Be(OH) on the surface of the magnesium ox...

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PUM

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Abstract

The invention relates to a magnesium oxide material and a preparing method thereof. According to the technical scheme, magnesium oxide fine powder and mixed solution are blended according to the mass ratio of 1:2 and placed in a mixing machine to be mixed for 0.5-8 h, so that mixed pulp is obtained; the mixed pulp is filtered and dried for 24 h at 110 DEG C, so that a mixture block is obtained; heat insulation is conducted on the mixture block for 1-6 h at 1000-1300 DEG C, cooling is conducted, and ball milling is conducted to 1-200 microns, so that the magnesium oxide material is obtained. The mixed solution is prepared from 5-30 wt% of beryllium hydroxide and 70-95 wt% of oxalic acid solution. The prepared magnesium oxide material has the advantages of being high in hydration resistance, stable in high temperature performance, high in high-temperature strength and excellent in erosion resistance, and is a novel raw material for preparing a high-temperature industrial high-grade refractory material.

Description

technical field [0001] The invention belongs to the technical field of refractory materials. In particular, it relates to a magnesium oxide material and a preparation method thereof. Background technique [0002] Magnesia material is the most widely used refractory material at present, and its main mineral raw material is magnesia (chemical composition is magnesium oxide). Magnesia is mainly divided into three types: sintered magnesia, seawater magnesia and fused magnesia. Sintered magnesia is mainly calcined at high temperature by magnesite, brucite or magnesium hydroxide extracted from seawater. The burnt magnesite fired with natural magnesite as raw material is called sintered magnesite, and the magnesite is smelted with electric arc furnace as raw material to reach a molten state and then cooled, which is called fused magnesia, which is extracted from seawater and oxidized. Magnesium is called seawater magnesia. With the technical progress of high temperature industr...

Claims

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Application Information

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IPC IPC(8): C01F5/02C04B35/66
CPCC01F5/02C04B35/66
Inventor 魏耀武张涛
Owner WUHAN UNIV OF SCI & TECH
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