Preparation method of high-chrome brick

A technology of high chromium bricks and chromium oxide particles, applied in the field of refractory materials, can solve the problems of affecting the service life of gasifiers, reducing the permeability resistance of high chrome bricks, and intensifying the penetration of cinders

Active Publication Date: 2010-02-17
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, since m-ZrO 2 Excellent chemical stability, it is difficult to chemically react with other substances in high chrome bricks to form a continuous solid solution, making m-ZrO 2 Independently exists outside the Al-Cr solid solution
During the use of high chrome bricks, the temperature rises, m-ZrO 2 The volume shrinks, creating gaps around, so that cinders are enriched in these gaps, and at the same time, with the penetration of cinders into the interior of high chrome bricks, m-ZrO 2 As the cinder migrates to the inside of the high chromium brick, holes are formed on the working surface, which intensifies the penetration of cinder, reduces the permeability resistance of the high chromium brick, and affects the overall service life of the gasifier

Method used

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  • Preparation method of high-chrome brick

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Effect test

Embodiment 1

[0011] Example 1: Using 2 o 3 The matrix is ​​magnesium oxide yttrium oxide composite stabilized zirconia powder with a particle size of 1 μm, accounting for 20%, 12%, 12%, and 1% of the total component mass respectively. The mass fraction of magnesia in the stabilized zirconia powder is 2%, the mass fraction of yttrium oxide in the stabilized zirconia powder is 1%, and the stabilization rate is 21%. Add 3% aluminum dihydrogen phosphate to the aggregate as a binder, add the matrix and mix evenly, after trapping the material, form a green body on a friction brick press, after drying, burn it in a high-temperature kiln at 1630°C to make a product.

Embodiment 2

[0012] Example 2: Using 2 o 3 powder and magnesia-stabilized zirconia powder with a particle size of 2 μm are used as the matrix, accounting for 15%, 12%, 10%, and 3% of the total component mass respectively. The mass fraction of magnesium oxide in the stabilized zirconia powder is 5%, and the stabilization rate is 33%. 4% aluminum dihydrogen phosphate is added to the aggregate as a binder, and the matrix is ​​added to mix evenly. After the material is trapped, the green body is formed on a friction brick press, and after drying, it is fired in a high-temperature kiln at 1700°C to make a product.

Embodiment 3

[0013] Example 3: Using 2 o 3 Magnesium oxide yttrium oxide composite stabilized zirconia powder with a particle size of 4 μm is used as the matrix, accounting for 25%, 15%, 8%, 8%, and 4% of the total component mass respectively. The mass fraction of magnesia in the stabilized zirconia powder is 6%, the mass fraction of yttrium oxide in the stabilized zirconia powder is 1%, and the stabilization rate is 47%. 6% aluminum dihydrogen phosphate is added to the aggregate as a binder, and the matrix is ​​added to mix evenly. After the material is trapped, the green body is formed on a friction brick press, and after drying, it is fired in a high-temperature kiln at 1700°C to make a product.

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Abstract

The invention provides a preparation method of a high-chrome brick, belonging to the field of fireproof material. The high-chrome brick is a key lining material of a water-coal-slurry gasification furnace. Compared with the prior high-chrome brick product, the invention does not influence the apparent porosity, the breaking strength and the thermal shock resistance of the prior high-chrome brick and can obviously enhance the coal cinder permeability resistance.

Description

technical field [0001] The invention belongs to the field of refractory materials, and mainly relates to a preparation method of a high-chromium brick, which is an important part of a refractory material for a coal gasification device. Background technique [0002] Coal water slurry pressurized gasifier is currently the most commonly used coal gasification device in China. The working temperature of coal water slurry gasifier is usually about 1500℃, the pressure in the furnace is about 5MPa, strong reducing atmosphere, liquid acidic slag, accompanied by high-speed erosion of gas, liquid and solid and fluctuation of air pressure. The materials make extremely high demands. High chromium bricks have high high temperature strength and excellent resistance to acid cinder penetration, and are the key lining materials for coal-water slurry gasifiers. [0003] Existing high-chrome bricks use sintered or fused chromium oxide particles or chromium corundum particles as aggregates, c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622C04B35/66
Inventor 闫双志孙红刚耿可明王刚王金相吕世坪
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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