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Magnesia spinel brick with high thermal shock resistance and preparation method thereof

A magnesia spinel and magnesia-aluminum spinel technology is applied in the field of high thermal shock stability magnesia spinel brick and its preparation field, which can solve the problems of poor thermal shock stability, affecting service life, easy cracking and the like, and achieves a simple process. , The effect of easy availability of raw materials and excellent thermal shock stability

Inactive Publication Date: 2018-03-06
WUHU QIANKAI MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the thermal shock stability of the existing refractory bricks is poor, and they are easy to crack, which greatly affects their service life.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0014] The invention provides a method for preparing magnesia spinel bricks with high thermal shock stability, the preparation method comprising:

[0015] 1) Ball milling magnesium aluminum spinel, zirconia, polyvinylpyrrolidone, and aluminum borate whiskers to prepare a ball milling composition;

[0016] 2) Mix and age kaolin, chlorite, aluminum slag, boron carbide, silicon sulfate, quartz sand, ball milling composition, calcium lignosulfonate, sodium silicate, cyclodextrin and water to prepare a mixture ;

[0017] 3) Press the mixture to make adobe;

[0018] 4) Drying, firing and cooling the adobes to produce magnesia spinel bricks with high thermal shock stability;

[0019] Among them, magnesium aluminum spinel is composed of particles A with an average particle size of 0.06-0.08mm, particles B with an average particle size of 0.15-0.25mm, and particles C with an average particle size of 1.5-2.2mm according to the ratio of 10:15-35: 6-10 composition by weight ratio.

[...

Embodiment 1

[0034] 1) Ball mill magnesium aluminum spinel, zirconia (average particle size: 0.15 mm), polyvinyl pyrrolidone, and aluminum borate whiskers (average length: 40 μm) in a weight ratio of 10:5.5:3.5:2 to obtain ball mill combination;

[0035] 2) Kaolin (average particle size 1.3mm), chlorite (average particle size 1.3mm), aluminum slag (average particle size 1.4mm), boron carbide (average particle size 2.8mm), silicon sulfate ( The average particle size is 2.7mm), quartz sand (average particle size is 2.9mm), the ball mill composition, calcium lignosulfonate, sodium silicate, cyclodextrin and water according to the ratio of 10:6:2.4:0.5:6 : 4: 10: 3: 4: 5: 40 weight ratio for mixing (mixing temperature is 35°C, mixing time is 50min), aging (aging temperature is 50°C, aging time is 15h) to obtain the mixed material;

[0036] 3) Press the mixture at 23MPa for 25min, then at 50MPa for 50min, and finally at 13MPa for 13min to make adobe;

[0037] 4) Dry the adobe (drying tempera...

Embodiment 2

[0040] 1) Ball mill magnesium aluminum spinel, zirconia (average particle size: 0.11 mm), polyvinyl pyrrolidone, and aluminum borate whiskers (average length: 30 μm) in a weight ratio of 10:5:3:1 to obtain ball mill combination;

[0041] 2) Kaolin (average particle size 1.1mm), chlorite (average particle size 1.1mm), aluminum slag (average particle size 1.1mm), boron carbide (average particle size 2.5mm), silicon sulfate ( The average particle size is 2.5mm), quartz sand (average particle size is 2.5mm), the ball mill composition, calcium lignosulfonate, sodium silicate, cyclodextrin and water according to the ratio of 10:5:2.1:0.2:5 : 2:8:2:3:3:30 by weight (mixing temperature is 30°C, mixing time is 40min), aging (aging temperature is 45°C, aging time is 10h) to obtain the mixed material;

[0042]3) Press the mixture at 20MPa for 20min, then at 40MPa for 40min, and finally at 10MPa for 10min to make adobe;

[0043] 4) Dry the adobe (drying temperature is 125°C, drying tim...

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Abstract

The invenbtion discloses a magnesia spinel brick with high thermal shock resistance and a preparation method thereof. The preparation method comprises the following steps: 1) performing ball milling on magnesium aluminate spinel, zirconia, polyvinylpyrrolidone and aluminum borate whisker so as to obtain a ball-milled composition; 2) mixing kaolin, chlorite, alumina slag, boron carbide, silica sulfate, quartz sand, the ball-milled composition, calcium lignosulphonate, sodium silicate, cyclodextrin and water and aging so as to obtain a mixture; 3) pressing the mixture to make a green brick; and4) drying, firing and cooling the green brick, thereby obtaining the magnesia spinel brick with high thermal shock resistance. The refractory brick has excellent thermal shock resistance.

Description

technical field [0001] The invention relates to refractory bricks, in particular to a magnesia spinel brick with high thermal shock stability and a preparation method thereof. Background technique [0002] The cement rotary kiln has experienced a long evolution and development process. At present, the cement industrial kiln is mainly composed of the kiln mouth, the lower transition zone, the firing zone, the lower transition zone and the safety zone; because the working environment of the firing zone and the transition zone is relatively harsh , so it is necessary to set refractory bricks on the kiln wall of the firing zone and the transition zone. The ideal refractory brick needs to have the following characteristics: 1) Excellent kiln skin hanging performance; 2) High thermal and chemical reaction resistance; 3) Excellent slag resistance; 4) Excellent mechanical strength; 5) Excellent thermal shock stability sex. However, the thermal shock stability of the existing refra...

Claims

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Application Information

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IPC IPC(8): C04B35/443C04B35/622C04B35/63C04B35/634C04B35/636C04B35/66C04B35/81
CPCC04B35/443C04B35/62204C04B35/6316C04B35/634C04B35/63444C04B35/636C04B35/66C04B35/803C04B2235/3244C04B2235/3418C04B2235/349C04B2235/3821C04B2235/448C04B2235/5276
Inventor 李春生张强
Owner WUHU QIANKAI MATERIAL TECH CO LTD
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