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Method for manufacturing high-purity magnesium-aluminum spinel

A pure magnesium-aluminum spinel and production method technology, applied in the field of high-quality refractory materials, can solve the problems of reducing material density, unrecoverable voids, and difficult to increase production capacity, and achieve increased processing difficulty, strong chemical corrosion resistance, Good thermal conductivity

Active Publication Date: 2010-03-17
JIANGSU JINGXIN NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the use of light-burned MgO is only suitable for slow firing, and it is difficult to increase the production capacity; in addition, the γ-Al in the raw material 2 o 3 and light-burned MgO to generate Mg(OH) in stages during the firing process 2 , it will occupy a certain space in the material structure, causing the volume to expand. After the crystal water is completely decomposed, the expanded gap cannot be recovered, resulting in residual gaps between the tissues and reducing the compactness of the material.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Choose Al 2 o 3 γ-Al content greater than or equal to 98% 2 o 3 , MgO content greater than or equal to 97% reburned MgO as raw material. Mix the two evenly by weight percentage 1:1; when mixing, drop into the compound grinding aid that comprises triethanolamine, ethylene glycol, sodium polyphosphate, stearic acid, the addition amount of compound grinding aid is the weight of the mixture 0.5% of the mixture, stir evenly, and then ultra-finely grind and classify by wind force to obtain a mixed powder with a fineness of 0.1-2 μm. Put the prepared mixed powder with a fineness of 0.1-2 μm into a ball forming machine, add binder and water, the amount of water added is 18%, and process it into a ball blank with a diameter of 28mm, and the density of the ball blank is 2g / cm 3 . After shaping and drying, it is calcined for 12 hours in an ultra-high temperature shaft kiln at a temperature of 1880°C to obtain spherical high-purity magnesium-aluminum spinel with a relative den...

Embodiment 2

[0014] Choose Al 2 o 3 γ-Al content greater than or equal to 98% 2 o 3 , MgO content greater than or equal to 97% reburned MgO as raw material. Mix the two evenly by weight percentage 19:1; when mixing, drop into the compound grinding aid that comprises triethanolamine, ethylene glycol, sodium polyphosphate, stearic acid, the addition amount of compound grinding aid is the weight of the mixture 0.02% of the mixture, stirred evenly, then ultra-finely ground, and classified by wind force to obtain a mixed powder with a fineness of 0.2-10 μm. Put the prepared mixed powder with a fineness of 0.2 to 10 μm into a ball forming machine, add a binder and water, the amount of water added is 25%, and process it into a ball blank with a diameter of 35mm, and the density of the ball blank is 2.5g / cm 3 . After shaping and drying, it is calcined for 20 hours in an ultra-high temperature shaft kiln at a temperature of 1930°C to obtain spherical high-purity magnesium-aluminum spinel wit...

Embodiment 3

[0016] Choose Al 2 o 3 γ-Al content greater than or equal to 98% 2 o 3 , MgO content greater than or equal to 97% reburned MgO as raw material. Mix the two evenly by weight percentage 2:1; when mixing, drop into the compound grinding aid that comprises triethanolamine, ethylene glycol, sodium polyphosphate, stearic acid, the addition amount of compound grinding aid is the weight of mixed material 1% of the mixture, stirred evenly, then ultra-finely ground, and classified by wind force to obtain a mixed powder with a fineness of 0.1-5 μm. Put the prepared mixed powder with a fineness of 0.1-5 μm into a ball forming machine, add binder and water, the amount of water added is 12%, and process it into a ball blank with a diameter of 15mm, and the density of the ball blank is 1.5g / cm 3 . After shaping and drying, it is calcined for 8 hours at a temperature range of 1820°C in an ultra-high temperature shaft kiln to produce spherical high-purity magnesium-aluminum spinel with ...

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Abstract

The invention provides a method for manufacturing high-purity magnesium-aluminum spinel, and relates to a method for manufacturing a high-quality fireproof material used in all kinds of thermal equipment widely applied in industries such as metallurgy, cement, glass and ceramics. The method comprises the following steps: mixing 50 to 95 weight percent of Gamma-Al2O3 and 50 to 5 weight percent of dead burnt MgO evenly; carrying out ultrafine grinding and mechanical classification; carrying out pelletizing, shaping and drying; and finally, obtaining finished products by calcining for 8 to 20 hours inside an ultrahigh temperature vertical kiln at a temperature of between 1,820 and 1,930 DEG C. The manufacturing method solves the problems in the prior art of low material density and low production capacity. The magnesium-aluminum spinel obtained by the manufacturing method has the characteristics of high melting point, low coefficient of heat expansion, excellent thermal conductivity, strong chemical corrosion resistance, and the like.

Description

technical field [0001] The invention relates to a production method of high-quality refractory materials widely used in various thermal equipment in metallurgy, cement, glass, ceramics and other industries, in particular to a production method of magnesium aluminum spinel. Background technique [0002] With the development of steel continuous casting and refining technology outside the furnace, part of the refining process is transferred from the steelmaking furnace to the ladle, which makes the ladle not only a high-temperature container for storing molten steel, but also a special metallurgical equipment. At present, the ladle lining material is mainly magnesium-aluminum spinel, which is widely used in the refractory industry due to its high melting point, high hardness, excellent thermal shock resistance and slag erosion resistance. However, the content of magnesium aluminum spinel in natural minerals is very small, so magnesium aluminum spinel is made of Al 2 o 3 Natur...

Claims

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Application Information

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IPC IPC(8): C01F7/16C04B35/66
Inventor 李正坤
Owner JIANGSU JINGXIN NEW MATERIAL
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