Thermal shock resistant corundum-magnesium aluminum spinel pouring material
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A magnesia-aluminum spinel and castable technology, applied in the field of corundum-magnesium-aluminum spinel refractory castables, can solve the problems of reducing the value of the fourth thermal shock resistance factor, affecting the thermal shock stability, excessive densification of materials, etc.
Inactive Publication Date: 2010-03-10
RUITAI MATERIALS TECHNOLOGY CO LTD
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However, these fine powders will produce a strong sintering effect during heat treatment, resulting in excessive densification of the material, or high strength, which greatly reduces the value of the fourth thermal shock resistance factor, thereby significantly affecting the thermal shock stability.
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Embodiment 1
[0031] Using 5-1mm sintered tabular alumina 55%, 1-0.088mm sintered tabular alumina 12%, d 90 90 <0.010mm sintered magnesium aluminum spinel 6%, activated magnesium aluminum spinel powder 3%, hydratable alumina 3.5%, silica fume 0.5%, plus polycarboxylate superplasticizer 0.1%, polyacrylic acid emulsion 2 %, followed by 3% water and. After forming, after curing, drying and heat treatment, the following performance indicators were measured: 110℃×24h heat treatment: bending resistance 7.8Mpa, pressure resistance 64.5Mpa. 1100℃×3h heat treatment, bending resistance 12.8Mpa, pressure resistance 120Mpa, line change -0.1%. 1500℃×3h heat treatment: flexural resistance 15.6Mpa, pressure resistance 150Mpa, line change +0.1%, 1100℃ air cooling 7 times elastic modulus retention rate 68%. Among them, the absolute value of the elastic modulus retention rate is nearly 25% higher than that of the original corundum-magnesium aluminum spinel castable.
Embodiment 2
[0033] Using 5-1mm sintered tabular alumina 58%, 1-0.088mm sintered tabular alumina 8%, 90 90 <0.010mm sintered magnesium aluminum spinel 6%, activated magnesium aluminum spinel powder 3%, hydratable alumina 3.5%, silica fume 0.5%, plus polycarboxylate superplasticizer 0.1%, polyacrylic acid emulsion 2 %, followed by 3% water and. After forming, after curing, drying and heat treatment, the following performance indicators were measured: 110℃×24h heat treatment: bending resistance 8.1Mpa, pressure resistance 60.1Mpa. 1100℃×3h heat treatment, bending resistance 10.0Mpa, pressure resistance 92Mpa, line change 0.0%. 1500℃×3h heat treatment: bending resistance 12.1Mpa, pressure resistance 120Mpa, line change +0.2%, 1100℃ air cooling 7 times elastic modulus retention rate 81%. Among them, the absolute value of the elastic modulus retention rate is nearly 38% higher than that of the original corundum-magnesium aluminum spinel castable.
[0034] The invention has good high-temperatu...
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Abstract
The invention relates to a corundum-magnesium aluminum spinel refractory pouring material, the combination is formed by relying on the reaction of polyacrylic acid, hydratable aluminum oxide and a substance containing magnesium oxide at normal temperature, and the combination is formed by relying on the sintering aiding role of a small amount of silicate at high temperature. The formula of the pouring material is as follows: 50-60% of corundum of 5-1mm, 8-16% of corundum or magnesium aluminum spinel of 1-0.088mm, 0-8% of desiliconized zirconium of small than 0.7mm, 16-25% of corundum or magnesium aluminum spinel with d90 of smaller than 0.088mm, 3-8% of magnesium aluminum spinel or alpha aluminum oxide with d90 of smaller than 0.010mm, 2-6% of hydratable aluminum oxide, 1-5% of magnesium-based additive, 0-1.5% of silica fume, 0.05-0.4% of added high-performance water reducing agent (polycarboxylic acid plus naphthalene sulfonation formaldehyde polymer plus sulfonated melamine polymer),0.5-4% of added polyacrylic acid system emulsion and 1-6% of water. The material has the advantages of good high temperature-resistant performance, very strong erosion-resistant ability, controllableafter-burning performance and higher thermal shock stability, thereby being applicable to being used as a senior refractory material for high temperature kilns of steel, iron and cement.
Description
technical field [0001] The invention relates to a corundum-magnesium aluminum spinel refractory castable. This material has the advantages of good high temperature resistance, strong corrosion resistance, high thermal shock stability, etc. It can be used in high temperature furnaces in the steel and cement industries to increase the life of the lining and achieve good energy saving and emission reduction effects. . Background technique [0002] Corundum-magnesium aluminum spinel is a widely used refractory castable. When used in a ladle, the magnesium-aluminum spinel castable absorbs FeO in the slag to form a solid solution of iron-aluminum spinel. By reducing the flux content in the slag, the erosion rate of the slag to the refractory material is slowed down, and the lining material is improved. service life. When used in cement kilns, the matrix of corundum castables can greatly improve the ability to resist chemical erosion by alkaline substances after adding magnesia-...
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