Thermal-shock-resistant corundum-spinel refractory castable and preparation method thereof

A refractory castable and spinel-based technology, applied in the field of refractory materials, can solve the problems of high thermal shock resistance requirements of refractory castables, accelerated slag erosion, damage to refractory castables, etc., to achieve a wide range of use, Improves corrosion resistance and prevents bursting

Inactive Publication Date: 2012-10-10
LUOYANG LIER REFRACTORY MATERIAL +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Corundum-spinel refractory castables are one of the most promising types of refractory castables, with the widest range of applications, and their product forms mainly include air-permeable seat bricks, nozzle seat bricks, ladle wall castables and RH dipped tube pouring materials, etc., and most of them are used in intermittent operation. During the rapid cooling and heating process, large thermal stress will be generated inside the castable, which will easily cause cracks on the surface of the refractory material, accelerate the rapid erosion of slag, and lead to the failure of the refractory castable. damage, which increases the cost of steelmaking, so the requirements for thermal shock resistance of refractory castables are higher
[0004] In order to make corundum-spinel refractory castables have good thermal shock resistance and slag erosion resistance, a small amount of chromium oxide is introduced into the raw materials, resulting in a large amount of environmentally harmful hexavalent Chromium, hexavalent chromium is very soluble in water and will exist in the environment for a long time, which will cause great harm to the human body

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Tabular alumina 10~5mm 15%; white corundum 5~3mm, 3~1mm, 1~0mm particles accounted for 14%, 20% and 18% respectively; white corundum fine powder 325 mesh 5%; calcined alumina fine powder 3%; activated alumina micropowder 3%; monoclinic zirconia 4%; magnesia aluminum spinel fine powder 325 mesh 15%; pure aluminate cement 3%; polyethylene fiber (additional) 0.06%; dispersed alumina high efficiency Water reducing agent (additional) 0.5%;

[0039] The preparation steps of this embodiment:

[0040] (1) Pre-mix corundum granules first, and then add corundum fine powder, alumina fine powder, zirconium-containing materials, magnesium aluminum spinel fine powder, binder and water reducing agent after mixing evenly, and continue mixing until fully uniform , dry mix for 3 minutes, add clean tap water, the amount added is about 4-5% of the raw material weight, adjust the dry humidity of the mud, and then mix for 2-3 minutes;

[0041] (2) Pour the stirred mud into the mold and vib...

Embodiment 2

[0045] White corundum 10~5mm 15%; white corundum 5~3mm, 3~1mm, 1~0mm accounted for 19%, 20% and 10% respectively; white corundum fine powder 325 mesh 11%; activated alumina fine powder 5% ; Zircon 6%; magnesia aluminum spinel fine powder 325 mesh 10%; pure aluminate cement 4%; polyethylene fiber (additional) 0.06%; dispersed alumina superplasticizer (additional) 0.5%;

[0046] Its preparation method is with example 1.

[0047] Its physical performance indicators are: after baking at 110℃×24h, the flexural strength is 10~13MPa, and the compressive strength is 60~70MPa; after reburning at 1550℃×3h, the flexural strength of the sample is 25~40MPa. The compressive strength is 120~140MPa, and the bulk density is 3.10~3.20g / cm -3, the apparent porosity rate is 13%~16%, and the linear change rate is -0.14~0.65%; after 20 minutes of heat preservation at 1100°C and 15 minutes of air cooling for 3 times, the residual rate of bending resistance is 40~60%, and the thermal shock resistanc...

Embodiment 3

[0049] White corundum 10~5mm 19%; white corundum 5~3mm, 3~1mm, 1~0mm accounted for 19%, 17% and 13% respectively; white corundum fine powder 325 mesh 5%; activated alumina fine powder 5% ; Fused zirconia corundum 8%; Magnesium-aluminum spinel fine powder 325 mesh 10%; Pure aluminate cement 4%; Polypropylene fiber (additional) 0.06%; Dispersed alumina superplasticizer (additional) 0.5%;

[0050] Its preparation method is with example 1.

[0051] Its physical performance indicators are: after baking at 110℃×24h, the flexural strength is 10~13MPa, and the compressive strength is 60~70MPa; after reburning at 1550℃×3h, the flexural strength of the sample is 25~40MPa. The compressive strength is 120~140MPa, and the bulk density is 3.10~3.20g / cm -3 , the apparent porosity rate is 13%~16%, and the linear change rate is -0.14~0.65%; after 20 minutes of heat preservation at 1100°C and 15 minutes of air cooling for 3 times, the residual rate of bending resistance is 40~60%, and the ther...

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Abstract

The invention discloses thermal-shock-resistant corundum-spinel refractory castable which comprises the following raw materials in percentage by weight: 65-80% of corundum particles and fine powder, 3-10% of aluminum oxide fine powder, 2-8% of materials containing Zr, 10-15% of magnesium-aluminum spinel fine powder, 3-8% of bonding agent, 0.05-0.1% of organic fiber (additional) and 0.2-0.6% of water reducing agent (additional). The preparation method of the corundum-spinel refractory castable comprises the following process steps of burdening, mixing, molding, maintaining, drying, storage and transportation, using and the like. Compared with the prior art, the thermal-shock-resistant corundum-spinel refractory castable provided by the invention has high thermal-shock-resistant property, and favorable high-temperature resistance and anti-erosion capability, and is suitable for steel ladles, intermediate ladles, RH (relative humidity) immersion tubes, cement high-temperature kilns and the like.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a thermal shock resistant corundum-spinel refractory castable and a preparation method thereof. Background technique [0002] The emergence of refractory castables is a milestone in the development history of refractory materials. It not only has excellent performance, but also has simple production technology and low cost, especially in high-temperature equipment such as ladles, converters, and electric furnaces. , leading to thermal shock fracture and shedding of refractory bricks, short service life and high production and maintenance costs. Castables have replaced the use of refractory bricks on high-temperature equipment such as ladles and tundishes, greatly improving the service life of equipment. [0003] Corundum-spinel refractory castables are one of the most promising types of refractory castables, with the widest range of applications, and their product f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 崔庆阳寇志奇赵继增李有奇毛晓刚徐兵吴林林孔祥魁金春燕朱庆丰
Owner LUOYANG LIER REFRACTORY MATERIAL
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