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Production method of metal compounded chromium oxide bricks

A chromium oxide brick and metal composite technology, which is applied in the field of refractory materials, can solve problems such as shortening the service life of refractory materials, affecting the service life of gasifiers, and increasing user burdens, and achieves improved thermal shock stability, excellent spalling performance, and excellent Anti-corrosion effect

Active Publication Date: 2015-06-10
REFRACTORY MATERIAL OF SINOSTEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Ordinary chromium oxide bricks increase the content of chromium, the porosity is 14-16%, higher, the compressive strength: ≧100 MPa, lower, and the thermal shock resistance is stable 1100 ℃, water cooling, <5 times, generally 0-2 times; air cooling <6 times, poor, making the gasifier very easy to peel off the structure due to large temperature and pressure fluctuations when starting and stopping, shortening the life of the refractory The service life also affects the service life of the entire gasifier, increasing the burden on users

Method used

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  • Production method of metal compounded chromium oxide bricks

Examples

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Effect test

Embodiment 1

[0017] A method for preparing metal composite chromium oxide bricks, using one or both of fused chromium oxide particles and corundum particles as aggregates, the mass fraction of the aggregate is: 55%-80%, and the mass fraction of the matrix 25-45%, the matrix contains fused chromium oxide fine powder, chromium oxide green, Al 2 o 3 Powder, corundum powder, zirconia powder, the mass fraction of the zirconia powder is 1-10%; add 1% metal silicon, then mix the aggregate in the sand mixer, add 2 / 3 of the binder to mix Mix well, then add the fine powder after co-grinding, mix well, finally add the remaining binder, and mix for about 5 minutes. After trapped material, pressed into green body, dried, fired at 1600-1800℃, reduced or nitrided fired in shuttle kiln, it is obtained.

Embodiment 2

[0019] A method for preparing metal composite chromium oxide bricks, on the basis of the preparation method described in Example 1, adding 0.5% metal chromium.

Embodiment 3

[0021] A method for preparing metal composite chromium oxide bricks. On the basis of the preparation method described in Example 1, 0.2% metal silicon and 0.5% metal aluminum are added.

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Abstract

The invention discloses a production method of metal compounded chromium oxide bricks. The content of Cr2O3 in chromium oxide bricks is not less than 80%, and a coal water slurry vaporizing furnace liner material having better performances than original chromium oxide bricks is formed through adding one or more of silicon, chromium, aluminum and iron to a formula of present chromium oxide bricks and through compounding. The metal compounded chromium oxide bricks produced in the invention have the characteristics of strong thermal shock resistance, low porosity and strong coal slag corrosion resistance, can meet strict conditions of large scale formation, high pressure, high productivity and high requirements of present coal water slurry vaporizing furnaces, and prolong the service life of the whole vaporizing furnace liner.

Description

technical field [0001] The invention belongs to the field of refractory materials, and mainly relates to a metal composite chromium oxide brick and a preparation method thereof, which is a key material for the inner lining of a coal-water slurry gasifier. Background technique [0002] The gasifier is the key equipment of the coal-water slurry pressurized gasification technology, and the bricks used for the fire surface of the coal-water slurry gasifier are the key materials related to the normal operation of the gasifier. The usual working conditions of the coal-water slurry pressurized gasifier are: working temperature 1300-1600 ℃, pressure 2.6-8.5MPa, strong reducing atmosphere, acid slag erosion, liquid slag discharge, and large temperature fluctuations when starting and stopping and pressure fluctuations. At present, chromium oxide bricks are successfully used as working lining materials for coal-water slurry pressurized gas furnaces, and the chromium oxide bricks are C...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 刘会林杨秀丽郑军锋李冰段少鹏徐彩霞张经伟赵俊峰孙志泳
Owner REFRACTORY MATERIAL OF SINOSTEEL CORP
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