Low thermal conductivity and high wear resistance corundum castable and preparation method thereof

A high wear-resistant, corundum-quality technology, applied in the field of refractory castable preparation, can solve the problems affecting the smooth and safe operation of the kiln, low thermal conductivity, low refractoriness, peeling and damage of lining materials, etc. The effect of good erosion performance and long service life

Active Publication Date: 2021-08-13
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, corundum castables, corundum silicon carbide castables, and mullite wear-resistant castables for kiln mouths are popularly used in the kiln mouth of large-scale new dry process kilns in China, but their thermal conductivity is relatively high and their refractoriness is relatively low. Penetration erosion of metal salts and erosion of cement clinker can easily cause peeling and damage of lining materials, affecting the smooth and safe operation of the kiln. With the development and progress of the industry, cement rotary kiln is the best equipment for co-processing, cement rotary kiln The range of co-processing will become wider and wider, which will also lead to more and more frequent fluctuations in the kiln atmosphere, volatile salt concentration, alkali-sulfur ratio, etc., and the requirements for the universality of materials will become more and more stringent

Method used

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  • Low thermal conductivity and high wear resistance corundum castable and preparation method thereof
  • Low thermal conductivity and high wear resistance corundum castable and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The content of each component is represented by mass percent:

[0032] Calcium hexaaluminate 80% with particle size ≤5mm,

[0033] Corundum fine powder 10%,

[0034] Pure calcium aluminate cement 10%,

[0035] Add 0.15% of the composite water reducing agent of the total mass of the above-mentioned raw materials.

[0036] Among them, the composite water reducer is made by mixing sodium tripolyphosphate and sodium hexametaphosphate in a mass ratio of 6:4.

[0037] Its preparation method is as follows:

[0038] (1) mixing the above-mentioned raw materials to obtain a mixed powder;

[0039] (2) adding water accounting for 6% of the total mass of the mixed powder, stirring evenly to obtain a mixture;

[0040] (3) Shaping the mixture by vibration, curing the molded green body at 25°C for 23 hours, demoulding, and drying at 130°C for 22 hours to obtain a low thermal conductivity and high wear resistance corundum castable.

Embodiment 2

[0042] The content of each component is represented by mass percent:

[0043] Calcium hexaaluminate 85% with particle size ≤ 5mm,

[0044] Corundum fine powder 10%,

[0045] Pure calcium aluminate cement 5%,

[0046] Add 0.20% of the composite water reducing agent of the total mass of the above-mentioned raw materials.

[0047] Among them, the composite water reducer is made by mixing sodium tripolyphosphate and polycarboxylate in a mass ratio of 8:2.

[0048] Its preparation method is as follows:

[0049] (1) mixing the above-mentioned raw materials to obtain a mixed powder;

[0050] (2) adding water accounting for 7% of the total mass of the mixed powder, stirring evenly to obtain a mixture;

[0051] (3) Shaping the mixture by vibration, curing the molded green body at 25°C for 24 hours, demoulding, and drying at 120°C for 24 hours to obtain a low thermal conductivity and high wear resistance corundum castable.

Embodiment 3

[0053] The content of each component is represented by mass percent:

[0054] Calcium hexaaluminate 85% with particle size ≤ 5mm,

[0055] Corundum fine powder 7%,

[0056] Pure calcium aluminate cement 8%,

[0057] Add 0.6% of the composite water reducing agent of the total mass of the above-mentioned raw materials.

[0058] Among them, the composite water reducer is made by mixing sodium hexametaphosphate and lignosulfonate in a mass ratio of 4:6.

[0059] Its preparation method is as follows:

[0060] (1) mixing the above-mentioned raw materials to obtain a mixed powder;

[0061] (2) adding water accounting for 5% of the total mass of the mixed powder, stirring evenly to obtain a mixture;

[0062] (3) The mixture was vibrated and molded, and the molded green body was cured at 20°C for 26 hours, then demoulded, and dried at 140°C for 20 hours to obtain a low thermal conductivity and high wear-resistant corundum castable.

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Abstract

The invention belongs to the technical field of preparation of refractory castables, and in particular relates to a corundum castable with low thermal conductivity and high wear resistance and a preparation method thereof. The low thermal conductivity and high wear resistance corundum castable is prepared from the following raw materials in weight percentage plus composite water reducer: calcium hexaaluminate particles 0-95%; corundum fine powder 0-10%; pure calcium aluminate Cement 3-10%. The low thermal conductivity and high wear resistance corundum castable of the present invention has the characteristics of low thermal conductivity, good high temperature performance, wear resistance and erosion resistance. It is applied to the position of the kiln mouth of the cement kiln, which can greatly reduce the temperature of the cement kiln shell and reduce the loss of heat dissipation. reduce, and its service life is greatly improved; the invention also provides its preparation method, which is scientific, reasonable, simple and easy to implement.

Description

technical field [0001] The invention belongs to the technical field of preparation of refractory castables, and in particular relates to a corundum castable with low thermal conductivity and high wear resistance and a preparation method thereof. Background technique [0002] Although the position of the kiln mouth of the cement kiln is not as high as the high temperature zone, the temperature of the clinker melt is about 1400°C. With the increase of the size of the kiln body, the increase of output, and the increase of the amount of clinker passing through per unit time, the thermal stress generated Damage effects still dominate. Secondly, there is no kiln skin protection at the kiln mouth, and the clinker and large pieces of kiln skin that have left the firing zone solidify and harden due to the drop in temperature, causing abrasion and erosion to the lining bricks. During the operation, it falls rapidly from the upper part, and the erosion effect on the lining brick canno...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
CPCC04B35/66C04B2235/3217C04B2235/3222C04B2235/447C04B2235/77C04B2235/96C04B2235/9607
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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