Flame-proof pouring material special for tertiary air tube shut-off device

A technology for refractory castables and gates, applied in the field of building materials, can solve problems such as affecting production efficiency, spalling of gate castables, poor wear resistance, etc. Good shock stability

Active Publication Date: 2009-07-29
ZHEJIANG KINGCRED NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The castables used in the original tertiary air duct shutters have poor wear resistance. Because the hot air in the tertiary air ducts contains a large amount of tiny hot clinker, the castables for the conventional product rams are severely peeled off, resulting in inflexible adjustment of the tertiary air ducts, resulting in kiln abnormal operation of the system
Because the gate is in the tertiary air duct, it is often washed by the tertiary wind, and the temperature of this part changes greatly, and the thermal shock is very strong. Due to the defect of material selection, the service life of the previous castable is not more than 6 months, which is serious. It restricts the operation of the cement production line, affects the production efficiency, increases the production cost, and does not meet the national energy saving and emission reduction requirements

Method used

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  • Flame-proof pouring material special for tertiary air tube shut-off device

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Experimental program
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Effect test

Embodiment 1

[0038] The special refractory castable for tertiary air duct shutter consists of the following components, expressed in weight percentage,

[0039] Mullite M70: 72%

[0040] Aluminum oxynitride: 8%

[0041] Pure calcium aluminate cement: 6%

[0042] a-AL 2 o 3 : 4%

[0043] Silica fume: 4%

[0044] Water: 6%.

[0045] In the preparation process, it is also necessary to additionally add dodecacalcium heptaaluminate, accounting for 2% of the total mass of the six components mixed, as a coagulant.

[0046] The special refractory castable for the tertiary air duct shutter of the present invention adopts high-quality raw materials with high purity, low impurities and high refractoriness, and strictly controls the composition of the matrix so that it forms a mullite crystal phase at high temperature. This kind of mullite The crystal phase is a columnar crystal with high strength and can form a mullite network skeleton structure, so it has extremely high wear resistance and th...

Embodiment 2

[0051] Consists of the following components, in percent by weight,

[0052] Mullite M70: 75%,

[0053] Aluminum oxynitride: 5%,

[0054] Pure calcium aluminate cement: 7%,

[0055] a-AL 2 o 3 : 3%,

[0056] Silica fume: 5%,

[0057] Water: 5%.

[0058] In the preparation process, it is necessary to additionally add dodecacalcium heptaaluminate, accounting for 2% of the total mass of the six components after mixing, as a coagulant.

[0059] Under such a ratio condition, the content of mullite M70 is the highest.

Embodiment 3

[0061] Mullite M70: 70%

[0062] Aluminum oxynitride: 10%

[0063] Pure calcium aluminate cement: 6%

[0064] a-AL 2 o 3 : 4%

[0065] Silica fume: 3%

[0066] Water: 7%.

[0067] In the preparation process, it is necessary to additionally add dodecacalcium heptaaluminate, accounting for 2% of the total mass of the six components after mixing, as a coagulant.

[0068] Under such a ratio condition, the content of mullite M70 is the lowest, and the cost is saved without reducing the use effect.

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Abstract

The invention discloses a refractory castable material special for tertiary air duct gates, comprising the following components according to the weight percentage: 70-75% of mullite M70, 5-10% of aluminum oxynitride (AlON), 6-7% of pure calcium aluminate cement, 3-4% of a-Al2O3, 3-5% of silica fume and 5-7% of water. During preparation, dodecacalcium heptaluminate (C12A7) with mass being 2% of the total mass of the mixed six components is additionally added. The refractory castable material special for tertiary air duct gates of the invention has extremely high wear-resisting property and thermal shock resistance. By adding AlON nano fine powder as an antioxidant, high thermal resistance and high temperature resistance to chemical erosion of products are improved; by increasing low temperature oxide of sodium oxide and reducing the sintering temperature of the castable material, the strength and wear-resisting property of products are improved; by adding C12A7 to adjust stripping time of the castable material, different requirements on the construction time and customers are met.

Description

technical field [0001] The invention relates to a building material, in particular to a special refractory castable for tertiary air duct shutters on a cement production line. Background technique [0002] With the construction boom in our country, the demand for cement in the market is increasing, and the cement factory is also constantly improving the cement manufacturing process. Since the ram of the tertiary air duct on the new dry-process cement production line is used to adjust the hot air consumption of the rotary kiln and calciner, the flexible adjustment of the ram will directly affect the clinker production quality and system heat consumption. The castables used in the original tertiary air duct shutters have poor wear resistance. Because the hot air in the tertiary air ducts contains a large amount of tiny hot clinker, the castables for the conventional product rams are severely peeled off, resulting in inflexible adjustment of the tertiary air ducts, resulting in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 朱国平刘家祥朱其良唐春强桑新良
Owner ZHEJIANG KINGCRED NEW MATERIAL CO LTD
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