Silica brick for cement rotary kiln and preparation method thereof

A technology of cement rotary kiln and silicon molybdenum bricks, which is applied in the field of refractory materials, can solve the problems of temperature rise, easy hanging of kiln skin, poor thermal stability, etc., and achieve the effect of ensuring practical life, avoiding high temperature and small thermal conductivity

Active Publication Date: 2022-03-25
郑州瑞泰耐火科技有限公司
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Problems solved by technology

With the advancement of cement rotary kiln technology, it is developing in the direction of large-scale, high wind and high pressure, the kiln speed is accelerated, the material flow rate is increased, and the temperature rises, which has seriously affected the service life of the silica molybdenum bricks used in the cement rotary kiln.
[0004] The existing silica molybdenum bricks used in cement rotary kilns have poor stability. When they are used in the later stage, their self-heavy weight will easily cause insufficient load-bearing capacity of the kiln body and affect the practical life; and their thermal stability is poor, and their ability to resist cement materials and salt erosion is insufficient; The bricks in the transition zone of the rotary kiln are easy to hang on the kiln skin, and the frequent shedding of the kiln skin will cause damage to the bricks caused by temperature changes, reducing the life of the cement kiln

Method used

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  • Silica brick for cement rotary kiln and preparation method thereof
  • Silica brick for cement rotary kiln and preparation method thereof
  • Silica brick for cement rotary kiln and preparation method thereof

Examples

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preparation example Construction

[0033] A preparation method for silica brick for cement rotary kiln, comprising the following steps:

[0034] Bauxite, white corundum, silicon oxynitride, α-Al 2 o 3 Micropowder, metal silicon powder, antioxidants, additives and binders, spare;

[0035] Grind bauxite into fine powder and classify it into three kinds of granular raw materials with different particle sizes of 5-3mm, 3-1mm and 1-0mm, and set aside; grind white corundum into 200 mesh fine powder, set aside; grind silicon oxynitride into 320 mesh fine powder, spare;

[0036]According to weight percentage: 15-20% of 5-3mm bauxite, 20-25% of 3-1mm bauxite, 15-20% of 1-0mm bauxite, 5-15% of 200 mesh white corundum, oxynitrided Silicon 5~20%, α-Al 2 o 3 2-10% of fine powder, 1-3% of antioxidant, 1-10% of additives, add the above raw materials into the mixer, stir for 3-5 minutes to obtain a dry mix, and then add a binder with a weight percentage of 3-5% of the dry mix, Then stir for 10 minutes to obtain the first...

Embodiment 1

[0041] A preparation method for silica brick for cement rotary kiln, comprising the following steps:

[0042] Bauxite, white corundum, silicon oxynitride, α-Al 2 o 3 Micropowder, metal silicon powder, antioxidants, additives and binders, spare;

[0043] Al of the bauxite 2 o 3 Content ≥ 88%; Al of the white corundum 2 o 3 Content ≥ 99%; silicon oxynitride: Si 2 N 2 O≥88%, metal silicon powder, Si≥90%

[0044] Grind bauxite into fine powder and classify it into three kinds of granular raw materials with different particle sizes of 5-3mm, 3-1mm and 1-0mm, and set aside; grind white corundum into 200 mesh fine powder, set aside; grind silicon oxynitride into 320 mesh fine powder, spare;

[0045] According to weight percentage: 15% of 5-3mm alumina, 25% of 3-1mm alumina, 20% of 1-0mm alumina, 10% of 200 mesh white corundum, 15% of silicon oxynitride, α-Al 2 o 3 4% micro powder, 2% antioxidant, 9% additives, add the above raw materials into the mixer, stir for 3-5 minute...

Embodiment 2

[0050] A preparation method for silica brick for cement rotary kiln, comprising the following steps:

[0051] Bauxite, white corundum, silicon oxynitride, α-Al 2 o 3 Micropowder, metal silicon powder, antioxidants, additives and binders, spare;

[0052] Al of the bauxite 2 o 3 Content ≥ 88%; Al of the white corundum 2 o 3 Content ≥ 99%; silicon oxynitride: Si 2 N 2 O≥90%, metal silicon powder, Si≥88%

[0053] Grind bauxite into fine powder and classify it into three kinds of granular raw materials with different particle sizes of 5-3mm, 3-1mm and 1-0mm, and set aside; grind white corundum into 200 mesh fine powder, set aside; grind silicon oxynitride into 320 mesh fine powder, spare;

[0054] According to weight percentage: 20% of 5-3mm alumina, 25% of 3-1mm alumina, 15% of 1-0mm alumina, 8% of 200 mesh white corundum, 16% of silicon oxynitride, α-Al 2 o 3 5% micro powder, 3% antioxidant, 8% additives, put the above raw materials into the mixer, stir for 3-5 minutes...

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Abstract

The invention relates to a silica brick for a cement rotary kiln and a preparation method thereof. The casting material is composed of alumina, white corundum, silicon oxynitride, α-Al 2 o 3 , metal silicon powder, antioxidants, additives and binder raw materials. When the invention is practical, the joints are more tightly assembled, the connections are firm, the force is integrated, the load-bearing capacity is strong, there is a cavity inside, and the self-weight Small, to ensure practical life; the first heat-resistant layer and the second heat-resistant layer heat-resistant material on both sides of the brick in the transition zone of the cement rotary kiln, using silicon oxynitride, has good thermal shock stability and erosion performance of cement and salt characteristics while utilizing molten SiO 2 Based on the principle that non-ferrous metals such as silicate and molten Al and Cu do not infiltrate silicon oxynitride ceramics, the cement rotary kiln transition zone bricks made of this brick do not hang the kiln skin; in the first temperature-resistant layer and the second In the middle of the temperature-resistant layer is a heat-insulating layer with a heat-insulating cavity, which has strong heat-insulating ability and small thermal conductivity, which can avoid high temperature of the kiln shell, reduce energy consumption, and reduce the cost of cement kiln.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a silica brick for a cement rotary kiln and a preparation method thereof. Background technique [0002] In the early days, superphosphate bricks, anti-flaking and wear-resistant bricks were used for the working lining of the cement kiln transition zone until the current silica bricks. The current silica bricks mainly use high-alumina bauxite clinker, high-quality silicon carbide as raw materials, and syrup as a binder. The thermal shock performance is unstable, and the oxide layer is deep after firing. The auxiliary kiln skin in the transition zone of the cement kiln falls off frequently, the temperature changes greatly, and the chemical erosion is severe. The refractory bricks are easily cracked, peeled off and damaged by ablation. [0003] Therefore, the thermal shock stability of silica bricks is extremely important. With the advancement of cement rotary kiln te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/103F27D1/06B28B3/00
CPCC04B35/103F27D1/06B28B3/00C04B2235/3873C04B2235/3463C04B2235/428C04B2235/96C04B2235/9615C04B2235/77
Inventor 袁林王旭圆李炜李祥李泉侑王强赵屹宋瑞峰孟凌霄
Owner 郑州瑞泰耐火科技有限公司
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