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Corundum firebrick with low heat conductivity and high corrosion resistance, and preparation method thereof

A corundum-based, low-thermal-conduction technology, which is applied in the field of low-thermal-conduction, high-corrosion-resistant corundum refractory bricks and its preparation, can solve the problems of increased mechanical stress on the kiln lining, large thermal load on the kiln body, and large thermal conductivity to reduce pores High efficiency, high temperature performance, and good corrosion resistance

Inactive Publication Date: 2018-04-13
ZIBO CITY LUZHONG REFRACTORIES CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the transition zone of large-scale new dry-process cement kilns in China is mainly configured with magnesia-alumina spinel bricks or silica-mo red bricks. Although the magnesia-alumina spinel bricks under the existing configuration have good high-temperature performance and are more suitable for this section, but Its thermal conductivity is large, which often causes the cylinder temperature in the transition zone to be too high, the thermal load of the kiln body is too large, and the mechanical stress on the kiln lining is increased. When the clinker liquid phase appears, the adaptability is very poor, and it is easy to form calcium aluminosilicate with low melting point, which leads to material damage, and the SiC contained in the silica red brick is easy to oxidize to form SiO during use. 2 , which and the Al contained in the material 2 o 3 A secondary mullite reaction occurs, resulting in volume expansion and exfoliation
Its alkali resistance is also poor, and it is also prone to alkali cracking to cause layers of peeling. Therefore, silica molybdenum bricks are not suitable for use in the transition zone, which is the fundamental reason why silica molybdenum bricks and silica molybricks have not been recognized abroad

Method used

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  • Corundum firebrick with low heat conductivity and high corrosion resistance, and preparation method thereof
  • Corundum firebrick with low heat conductivity and high corrosion resistance, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The content of each component is represented by mass percent:

[0036] 85% calcium hexaaluminate with particle size ≤5mm,

[0037] α-alumina micropowder 13%,

[0038] Rare metal oxide powder 2%,

[0039] Among them, the rare metal oxide fine powder is mixed with yttrium oxide fine powder and zinc oxide fine powder at a mass ratio of 10:1.

[0040] Its preparation method is as follows:

[0041] The above raw materials are weighed and mixed, based on the mixed powder, add 2% Nai system binder, and mix uniformly to make a mixed powder. Put the above mixed material into a mold, press it with a press, and heat it at 110 ° C. After 24 hours of heat preservation and drying, it is fired in a tunnel kiln at 1550±25°C for 8 hours to make corundum refractory bricks with low thermal conductivity and high corrosion resistance.

[0042] The naphthalene binder is naphthalene sulfonate formaldehyde condensate.

[0043] The performance test results are shown in Table 1.

Embodiment 2

[0045] The content of each component is represented by mass percent:

[0046] 90% calcium hexaaluminate with particle size ≤5mm,

[0047] α-alumina micropowder 8%,

[0048] Rare metal oxide powder 2%,

[0049] Among them, the rare metal oxide powder is mixed with yttrium oxide powder and zinc oxide powder in a mass ratio of 5:5.

[0050] Its preparation method is as follows:

[0051] The above raw materials are weighed and mixed, based on the mixed powder, plus 2% Nai series binder, mixed uniformly to make a mixed powder, the above mixed material is put into a mold, pressed with a press, and heated at 130 ° C. After 24 hours of heat preservation and drying, it is fired in a tunnel kiln at 1600±25°C for 8 hours to make corundum refractory bricks with low thermal conductivity and high corrosion resistance.

[0052] The naphthalene binder is naphthalene sulfonate formaldehyde condensate.

[0053] The performance test results are shown in Table 1.

Embodiment 3

[0055] The content of each component is represented by mass percent:

[0056] Calcium hexaaluminate 92% with particle size ≤5mm,

[0057] α-alumina micropowder 5%,

[0058] Rare metal oxide powder 3%,

[0059] Among them, the rare metal oxide powder is mixed with yttrium oxide powder and zinc oxide powder at a mass ratio of 1:10.

[0060] Its preparation method is as follows:

[0061] Based on the above mixed powder, add 2% of the Na-based binder, mix evenly to make a mixed powder, press the above mixed material with a press, dry it at 130°C for 24 hours, and then keep it in a tunnel kiln at 1675±25°C Fired for 8 hours to make corundum refractory bricks with low thermal conductivity and high corrosion resistance.

[0062] The naphthalene binder is naphthalene sulfonate formaldehyde condensate.

[0063] The performance test results are shown in Table 1.

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Abstract

The invention specifically relates to a corundum firebrick with low heat conductivity and high corrosion resistance, and a preparation method thereof, belonging to the field of preparation technologyfor refractory materials. The corundum firebrick with low heat conductivity and high corrosion resistance is prepared from calcium hexaaluminate particles, alpha-alumina micropowder and rare metal oxide micropowder through mixing, molding, drying and firing. The corundum firebrick provided by the invention has the characteristics of low heat conductivity, good high-temperature performance, wear resistance and erosion resistance; when the corundum firebrick is applied to the transition zone of a cement kiln, the corundum firebrick can greatly reduce the cylinder temperature of the cement kiln,lower heat loss and greatly prolong the service life of the cement kiln; and the preparation method is also provided and is scientific, reasonable, simple and practical.

Description

technical field [0001] The invention belongs to the technical field of refractory material preparation, and in particular relates to a corundum refractory brick with low thermal conductivity and high corrosion resistance and a preparation method thereof. Background technique [0002] The cement kiln transition zone is the section with the most severe service conditions in the cement kiln. The temperature in this section changes frequently, the flames come in and out, and the kiln skin hangs and falls off. The kiln lining material is often in a state of no kiln skin protection, and is directly exposed to high-temperature radiation and hot air. Therefore, the kiln lining material in this section not only bears chemical erosion caused by heavy metals, alkali compounds, clinker liquid, thermal stress caused by temperature changes, thermal shock spalling of materials, and is also subject to mechanical stress caused by material erosion and mechanical vibration. Wait. [0003] At...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/101
CPCC04B35/101C04B2235/3222C04B2235/3225C04B2235/3284C04B2235/77C04B2235/96C04B2235/9607C04B2235/9669C04B2235/9692
Inventor 陈俊红封吉圣贾元平李斌朱波郭玉涛唐竹兴
Owner ZIBO CITY LUZHONG REFRACTORIES CO LTD
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