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Fireproof magnesia alumina spinel materials and method for preparing same

A technology of magnesia-aluminum spinel and refractory raw materials, applied in the field of refractory materials, can solve the problems of affecting the high temperature performance of materials, low densification degree and high impurity content of magnesia-aluminum spinel

Inactive Publication Date: 2005-08-17
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the above two methods completely use natural raw materials, the synthetic magnesia-aluminum spinel has high impurity content, and the degree of densification is not high, and affects the high-temperature performance of the material.

Method used

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Examples

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Comparison scheme
Effect test

Embodiment 1

[0009] A kind of production method of magnesium aluminum spinel refractory raw material: according to the stoichiometric composition of spinel, Al 2 o 3 γ-Al content greater than or equal to 98% 2 o 3 1. Lightly burned MgO with an MgO content greater than or equal to 98% is uniformly mixed, and then pressed to form under a pressure of 200 MPa. At 1600-1700°C, heat for 3-5 hours and fire. Magnesium-aluminum spinel refractory raw materials with a relative density of 94-95% can be produced.

Embodiment 2

[0011] A kind of production method of magnesium aluminum spinel refractory raw material: with Al 2 o 3 γ-Al content greater than or equal to 98% 2 o 3 , MgO content greater than or equal to 98% light-burned MgO as raw material, 65% to 77% of γ-Al 2 o 3 After mixing evenly with 35%-23% light-burned MgO, press molding on a 200MPa press, and then burn at a temperature of 1600°C-1800°C, and the holding time is 2-5 hours. Magnesium-aluminum spinel refractory raw materials with a relative density of 94-96% can be produced.

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Abstract

The present invention is refractory magnesia alumina spinel material and its production process. The production process includes mixing gamma-alumina in 65-77 wt% and light burnt magnesia in n23-35 wt%, forming the mixture at 200-280 MPa, and sintering at 1600-1800 deg.c for 2-5 hr. The gamma-alumina has alumina content not less than 98 %, and the light burnt magnesia has MgO content not less than 98 %. The present invention adopts gamma-alumina with production temperature higher than that of alpha-alumina, higher activity, higher Al2O3 content and crystal structure similar to that of magnesia alumina spinel material, and this is favorable to synthesizing compact spinel, can lower the sintering temperature of spinel greatly and lower cost. The present invention may be used as refractory material alone and added into other material to raise the performance. The prepared magnesia alumina spinel material has relative density of 95 %.

Description

1. Technical field [0001] The invention belongs to the field of refractory materials. In particular, it relates to a magnesium aluminum spinel refractory raw material and a production method thereof. 2. Background technology [0002] Magnesium-aluminum spinel is widely used in the refractory industry because of its high melting point, high hardness, thermal shock resistance and slag erosion resistance. Especially in recent years, it has been recognized that Cr in chromium-containing materials 2 o 3 The soluble chromium compounds formed by reacting with alkali in high temperature environment are very harmful to the environment, so periclase-spinel refractories have been widely valued. However, the content of spinel in nature is very small, and the currently commercially available high-purity magnesium-aluminum spinel is made of α-Al 2 o 3 Synthesized with MgO. α-Al 2 o 3 There is 7% volume expansion (E.Ryshkewitch.Oxide ceramics.Academic Press, New York, 1960, pp.257-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/04C04B35/10C04B35/66
Inventor 李楠张智慧
Owner WUHAN UNIV OF SCI & TECH
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