Novel abrasion resistant silicon-mullite-nitrogen brick for transition zones of rotary cement kiln

A silicon molybdenum brick and silicon carbide technology, which is used in rotary drum furnaces, furnace types, lighting and heating equipment, etc. The effect of reducing the surface temperature of the cylinder, improving work efficiency, and saving energy

Inactive Publication Date: 2011-07-06
GONGYI TONGDA ZHONGYUAN REFRACTORY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the fatal weakness of ordinary silica bricks is poor oxidation resistance. When in an oxidizing atmosphere, especially when solid waste is incinerated, the atmosphere in the kiln f

Method used

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  • Novel abrasion resistant silicon-mullite-nitrogen brick for transition zones of rotary cement kiln

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Super high alumina bauxite aggregate 0~6mm Al 2 o 3 ≥85% 55%

[0036] Silicon carbide 0~1mm SiC≥95% 3%

[0037] Silicon carbide ≤0.088mm SiC≥95% 8%

[0038] Brown corundum fine powder 5%

[0039] Andalusite Powder 14%

[0040] Silicon nitride 7%

[0041] Ferrosilicon Nitride 0%

[0042] Clay 5%

[0043] Add lignosulfonic acid solution 3%

Embodiment 2

[0045] Super high alumina bauxite aggregate 0~6mm Al 2 o 3 ≥85% 54%

[0046] Silicon carbide 0~1mm SiC≥95% 2%

[0047] Silicon carbide ≤0.088mm SiC≥95% 3%

[0048] Brown corundum fine powder 6%

[0049] Andalusite Powder 14%

[0050]Silicon nitride 7%

[0051] Ferrosilicon Nitride 5%

[0052] Clay 5%

[0053] Add lignosulfonic acid solution 5%

[0054] As can be seen from Table 2, compared with the comparative examples without adding silicon nitride or ferrosilicon nitride, the present invention has low thermal conductivity, high wear resistance, The advantages of alkali corrosion resistance and oxidation resistance greatly improve the working efficiency of cement kiln.

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Abstract

The invention relates to a refractory material forming product applied to transition zones of a rotary cement kiln, and the refractory material forming product provided by the invention is formed by molding through machine pressing and high-temperature calcination. In the invention, silicon nitride or ferro-silicon nitride is introduced into the traditional silicon-mullite brick or silicon-mullite red brick. The temperature at which silicon nitride starts oxidizing in an oxidizing atmosphere is 1300 DEG C, and the temperature at which silicon carbide starts oxidizing in the oxidizing atmosphere is 800 DEG C, thus the oxidation resistance of the silicon-mullite brick can be obviously improved. In addition, since silicon nitride has less coefficient of linear expansion, lower coefficient of heat conductivity and stronger alkali corrosion resistance as compared with silicon carbide, the manufactured novel silicon-mullite-nitrogen brick has lower coefficient of heat conductivity, less volume change and more excellent alkali corrosion resistance. The silicon-mullite brick manufactured by the method is used for the transition zones of the rotary cement kiln, the temperature of a kiln body can be significantly reduced, and the silicon-mullite brick has less possibility of being oxidized, therefore, the service life of the abrasion resistant material of the transition zones of the cement kiln is prolonged and is up to 1.5-2 years. The novel abrasion resistant silicon-mullite-nitrogen brick is especially suitable for the upper and lower transition zones of the rotary kiln with frequent changes of atmosphere in the kiln.

Description

technical field [0001] The invention relates to a refractory brick, in particular to an anti-oxidation and low heat conduction silicon molybdenum brick used in the upper and lower transition zones of a large cement rotary kiln. Background technique [0002] At present, two kinds of bricks are commonly used in the upper and lower transition zones of the cement rotary kiln, magnesia-aluminum spinel bricks and silica molybdenum bricks. The magnesia-aluminum spinel brick mainly has a high thermal conductivity. At 1000°C, the thermal conductivity reaches 3.0, so that the temperature of the outer skin of the upper and lower transition zones reaches 380-400°C. In addition to causing waste of fuel, it is also easy to cause Deformation, so that the bricks in the kiln will fall off, peel off and be damaged, which will affect the service life. When silica bricks are selected for the upper and lower transition zones of the rotary kiln, the thermal conductivity of the silica bricks is r...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/10F27B7/20
Inventor 冯运生李献明王林俊康华荣高长贺董胜英周新功周伟王治峰
Owner GONGYI TONGDA ZHONGYUAN REFRACTORY TECH
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