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Preparation method of zircon corundum brick containing chromic oxide

A zirconium corundum brick and chromium oxide technology, applied in the field of refractory materials, can solve the problems of inability to withstand thermal shock, poor thermal shock resistance, poor alkali resistance or sodium borate vapor performance, etc., and achieve the effect of improving corrosion resistance.

Active Publication Date: 2015-03-25
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The brick structure is dense, and the apparent porosity is as low as 2%, so the thermal shock resistance is poor, and it cannot withstand the thermal shock during the replacement of small furnaces; the brick has poor alkali or sodium borate steam resistance, and is used in small horseshoe flame kilns. Furnace and other parts have poor effect and have the defect of short service life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: A method for preparing a zirconia corundum brick containing chromium oxide, the raw material components and weight percentages are: 65% of fused-cast zirconia corundum particles with a particle size of 0.1-4 mm, 17% of white corundum fine powder, and chromium oxide fine powder 13%, chromium oxide powder 2%, α-Al 2 o 3 powder 3%; the amount of the binder aluminum dihydrogen phosphate solution added is 2.0% of the total weight of the above raw materials. Wherein, the fused-cast zirconium corundum particles are graded according to less than or equal to 4 mm, greater than 3 mm, less than or equal to 3 mm, greater than 2 mm, less than or equal to 2 mm, greater than 1 mm, less than or equal to 1 mm, and greater than 0.1 mm. 10%, 20%, 20%, 15% of the total weight of a zirconium corundum brick containing chromium oxide. Adjust the oxygen partial pressure of the firing atmosphere to 0.1 Pa, and heat it at 1430°C for 6 hours.

[0017] A zirconium corundum brick cont...

Embodiment 2

[0018] Example 2: A preparation method of zirconia corundum bricks containing chromium oxide, the raw material components and weight percentages are: 65% of fused-cast zirconia corundum particles with a particle size of 0.1-4 mm, 10% of white corundum fine powder, and chromium oxide fine powder 5%, chromium oxide powder 10%, α-Al 2 o 3 powder 10%; the addition of the binder aluminum dihydrogen phosphate solution is 4.0% of the total weight of the above raw materials. Wherein, the fused-cast zirconium corundum particles are graded according to less than or equal to 4 mm, greater than 3 mm, less than or equal to 3 mm, greater than 2 mm, less than or equal to 2 mm, greater than 1 mm, less than or equal to 1 mm, and greater than 0.1 mm. 10%, 15%, 25%, and 15% of the total weight of a zirconium corundum brick containing chromium oxide. Adjust the oxygen partial pressure of the firing atmosphere to 10 Pa, and heat it at 1380°C for 10 hours.

[0019]A zirconium corundum brick cont...

Embodiment 3

[0020] Example 3: A method for preparing zirconia corundum bricks containing chromium oxide, the raw material components and weight percentages are: 65% of fused-cast zirconia corundum particles with a particle size of 0.1-4 mm, 25% of chromium oxide fine powder, and 5% of chromium oxide powder %, α-Al 2 o 3 powder 5%; the amount of binder phosphoric acid solution added is 3.0% of the total weight of the above raw materials. Wherein, the fused-cast zirconium corundum particles are graded according to less than or equal to 4 mm, greater than 3 mm, less than or equal to 3 mm, greater than 2 mm, less than or equal to 2 mm, greater than 1 mm, less than or equal to 1 mm, and greater than 0.1 mm, respectively It accounts for 5%, 25%, 15%, and 20% of the total weight of a zirconium corundum brick containing chromium oxide. Adjust the oxygen partial pressure of the firing atmosphere to 1Pa, and heat it at 1400°C for 10 hours.

[0021] A zirconium corundum brick containing chromium ...

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Abstract

The invention belongs to the technical field of a refractory material, and in particular relates to a preparation method of a zircon corundum brick containing chromic oxide. The preparation method comprises the following steps: taking fused zircon corundum particles and chromic oxide particles as aggregate, adding chromic oxide fine powder, chromic oxide powder, alpha-Al2O3 powder and white corundum fine powder as a matrix, adding a binding agent, mixing materials, molding and drying, adding the obtained mixture to a nitrogen kiln, regulating the oxygen partial pressure of a firing atmosphere and carrying out low-temperature firing so as to obtain the zircon corundum brick. The brick disclosed by the invention is applicable to such parts as the burner sidewall, burner crown, burner slope and regenerative chamber wall of a horseshoe flame furnace as well as the flue of an alkali-free glass fiber tank furnace; the zircon corundum brick has the characteristics of being excellent in thermal shock resistance, slag corrosion resistance and the like, and the brick is relatively high in industrial application and popularization values.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a preparation method of chromium oxide-containing zirconium corundum bricks. Background technique [0002] Fused-cast zirconium corundum bricks are used in small furnace side walls, small furnace walls, small furnace ramps, regenerator walls, and flue ducts of non-alkali glass fiber kilns in horseshoe flame kilns. There are alternating fires in the above parts during use, and the bricks are required to have good thermal shock resistance and can withstand the impact of a large amount of high-speed cold air in an instant; at the same time, they can withstand alkali steam, SO 2 And sodium borate and other corrosion. [0003] In the production process of fused-cast zirconium corundum bricks, the raw materials such as industrial alumina powder, zircon sand, desiliconized zirconium and a small amount of soda ash are firstly mixed evenly, put into the electric ...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/10C04B35/622
Inventor 尹洪基耿可明胡飘石鹏坤王晗李坚强马旭峰周军李宗泰
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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