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Boron nitride composite magnesium-aluminum spinel brick for corrosion-resistant cement kiln transition zone and preparation method thereof

A technology of magnesia-alumina spinel brick and magnesia-alumina spinel, which is applied in the field of boron nitride composite magnesia-alumina spinel brick and its preparation in the transition zone of anti-corrosion cement kiln, which can solve the problem of skinning, seriousness, aggravation, etc. question

Active Publication Date: 2020-11-06
WUHU QIANKAI MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, in the existing cement rotary kiln, the resource reuse of various industrial wastes and the use of low-grade raw fuels are often used, so that the cement kiln becomes the consumer of industrial waste, and the burning of these wastes makes the cement kiln The increased circulation of alkali, chlorine and sulfur will intensify the erosion of refractory materials, and the problem of crusting will become more serious

Method used

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  • Boron nitride composite magnesium-aluminum spinel brick for corrosion-resistant cement kiln transition zone and preparation method thereof

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preparation example Construction

[0015] The invention provides a method for preparing a boron nitride composite magnesium-aluminum spinel brick for the transition zone of an anti-corrosion cement kiln. The preparation method comprises:

[0016] 1) In the presence of protective gas, calcining magnesium aluminum spinel, boron nitride, perlite, carbon powder, and metal chloride salts to obtain calcined products;

[0017] 2) Mix and age bauxite, mullite, aluminum slag, silicon carbide, alumina, zircon sand, calcined products, calcium lignosulfonate, sodium silicate, cyclodextrin and water to obtain Mixture;

[0018] 3) Press the mixture to make adobe;

[0019] 4) Drying, firing and cooling the bricks to produce boron nitride composite magnesium-aluminum spinel bricks for the transition zone of anti-corrosion cement kilns;

[0020] Among them, the magnesium aluminum spinel is composed of spinel particles A with an average particle size of 0.12-0.18mm, spinel particles B with an average particle size of 0.32-0.45...

Embodiment 1

[0036] 1) Under the protection of argon, magnesium aluminum spinel, boron nitride (average particle size of 0.14mm) and perlite (average particle size of 0.15mm), carbon powder, metal chloride salt (made by chloride Nickel, chromium chloride, molybdenum pentachloride, vanadium chloride and germanium chloride are composed according to the weight ratio of 5:3:2:1:0.8) and calcined according to the weight ratio of 10:1.3:5:3:1.2 (first Raise the temperature of the material from 25°C to 180°C at 1°C / min and hold it for 1.5h, then raise the temperature at 0.7°C / min to 500°C and hold it for 4h, and finally cool it down to 340°C at 1.3°C / min and hold it for 1.5h) to produce Get calcined products;

[0037] 2) Bauxite (average particle size 1..4mm), mullite (average particle size 1.3mm), aluminum slag (average particle size 1.2mm), silicon carbide (average particle size 2.8mm) , alumina (average particle size 2.7mm), zircon sand (average particle size 2.6mm), the calcined product, cal...

Embodiment 2

[0042] 1) Under the protection of argon, magnesium aluminum spinel, boron nitride (average particle size 0.11mm) and perlite (average particle size 0.10mm), carbon powder, metal chloride salt (made by chloride Nickel, chromium chloride, molybdenum pentachloride, vanadium chloride and germanium chloride are composed according to the weight ratio of 5:2:1:0.8:0.5) and calcined according to the weight ratio of 10:1:2:2.5:0.8 (first Raise the temperature of the material from 15°C to 150°C at 0.8°C / min and hold it for 1 hour, then raise the temperature at 0.4°C / min to 480°C and hold it for 3 hours, and finally cool it down to 300°C at 1°C / min and hold it for 1 hour) to obtain calcined product;

[0043] 2) Bauxite (average particle size 1.1mm), mullite (average particle size 1.1mm), aluminum slag (average particle size 1.1mm), silicon carbide (average particle size 2.5mm), oxide Aluminum (average particle size 2.5mm), zircon sand (average particle size 2.5mm), the calcined product,...

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Abstract

The invention discloses a boron nitride composite magnesium-aluminum spinel brick for an anti-corrosion cement kiln transition zone and a preparation method thereof. The preparation method comprises the following steps: (1) calcining magnesium-aluminum spinel, boron nitride, perlite, carbon powder and metal chloride salt under the existence of a shielding gas, thus obtaining a calcined product; (2) mixing and aging bauxite, mullite, aluminum slag, silicon carbide, aluminum oxide, zircon sand, the calcined product, calcium lignosulfonate, sodium silicate, cyclodextrin and water, thus obtaininga mixture; (3) pressing the mixture, thus obtaining a green brick; (4) drying, burning and cooling the green brick, thus preparing the boron nitride composite magnesium-aluminum spinel brick for the anti-corrosion cement kiln transition zone. The boron nitride composite magnesium-aluminum spinel brick for the anti-corrosion cement kiln transition zone, disclosed by the invention, has excellent corrosion resistance.

Description

technical field [0001] The invention relates to a boron nitride composite magnesium-aluminum spinel brick, in particular to a boron nitride composite magnesium-aluminum spinel brick for an anti-corrosion cement kiln transition zone 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/5835C04B35/443
CPCC04B35/443C04B35/583C04B35/62204C04B35/66C04B2235/3217C04B2235/3418C04B2235/3427C04B2235/3463C04B2235/3826C04B2235/422C04B2235/444C04B2235/9669
Inventor 李春生张强
Owner WUHU QIANKAI MATERIAL TECH CO LTD
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