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Treated refractory material and methods of making

A refractory material and refractory technology, applied in nanotechnology, ceramic products, applications, etc. for materials and surface science, can solve problems such as refractory decline and achieve the effect of extending the service life

Inactive Publication Date: 2010-07-28
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This infiltration leads to a decrease in refractoriness through a combination of particle disintegration, particle undercutting, and macroscopic cracking

Method used

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  • Treated refractory material and methods of making
  • Treated refractory material and methods of making
  • Treated refractory material and methods of making

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Embodiment 1

[0049]Sintered high chromium oxide (90% by weight) bricks were infiltrated several times with a solution of chromium(III) nitrate, followed by heat treatment at 600° C. in air for 2 hours to decompose the nitrates into chromium oxides. After full penetration, the weight of the protective material constitutes about 10% by weight of the refractory brick. The infiltrated bricks were then annealed in nitrogen at 1600° C. for 20 hours to pre-react the chromia prior to slag infiltration. The porosity of the untreated refractory prior to slag infiltration was about 18-20% by volume. After infiltration and heat treatment, the porosity is about 12-14% by volume.

[0050] Slag infiltration tests with slag-filled cups for isothermal annealing were performed on bricks infiltrated with chromia and untreated bricks. The slag composition contained 59.0% silica, 10.7% alumina, 8.3% calcium oxide, 21.6% iron oxide and 0.3% potassium oxide. The test parameters are 1490°C, 20 hours, 10^-10atm...

Embodiment 2

[0052] Example 1 was repeated except that chromium(III) acetate (Cr3(OH)3(CH3COO)2) was used as the precursor of the chromium oxide protective material. Slag infiltration tests with slag-filled cups for isothermal annealing were performed on bricks infiltrated with chromia and untreated bricks. The test parameters are 1500°C, 20 hours, 10^-10atm oxygen partial pressure provided by a mixture of wet and dry N2 / 3%H2 gas.

[0053] Subsequent analysis of the slag penetration by XRF patterns of the Si distribution in the brick cross-section showed that the slag penetration was much smaller in the treated bricks than in the untreated bricks. image 3 A shows XRF patterns of slag-infiltrated Si for untreated bricks and bricks treated with chromia. Example 3

Embodiment 3

[0054] Example 1 was repeated except that aluminum nitrate was used as the precursor for the alumina protective material. Slag infiltration tests with slag-filled cups for isothermal annealing were performed on bricks infiltrated with alumina and untreated bricks. The test parameters are 1500°C, 20 hours, 10^-10atm oxygen partial pressure provided by a mixture of wet and dry N2 / 3%H2 gas.

[0055] Subsequent analysis of the slag penetration by XRF patterns of Si distribution in the brick cross-section revealed that the slag penetration in the treated bricks was much smaller than in the untreated baseline bricks. image 3 B shows XRF patterns of slag-infiltrated Si for untreated bricks and bricks treated with alumina. Example 4

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Abstract

A treated refractory material includes a refractory material having a plurality of pores, wherein the refractory material comprises aluminum oxide, silicon oxide, magnesium oxide, chromium oxide, zirconium oxide, titanium oxide, calcium oxide, fireclay, silicon carbide, tungsten, mullite, dolomite, magnesite, magnesium aluminum oxide, chromite, magnetite, or a combination comprising at least one of the foregoing; and a protective material disposed within the plurality of pores of the refractory material, wherein the protective material is selected from the group consisting of aluminum oxide, chromium oxide, silica, rare earth oxides, rare earth zirconates, titanium oxide, mullite, zirconium oxide, zirconium silicate, yttrium oxide, magnesium oxide, iron oxide, and blends thereof.

Description

[0001] This application is a continuation-in-part of a legally related application, US Nonprovisional Patent Application 11 / 683,260, filed March 7, 2007, which is hereby incorporated by reference in its entirety. Background technique [0002] In a slagging gasifier, solid feedstock, such as coal or coke, is partially oxidized at about 1300 to 1600°C to produce a mixture of carbon monoxide, carbon dioxide, hydrogen and water (commonly called "syngas"). Coal generally may contain up to about 5 to 25% by weight inorganic minerals that combine to form a low viscosity slag containing silica, alumina, calcium oxide and iron oxide. [0003] The walls of the gasifier are lined with a refractory material, usually formed of bricks and sintered chromium oxide (Cr 2 o 3 ) particles or Cr 2 o 3 and alumina pellets. Refractory materials have a connected pore structure and are highly porous (eg, up to 20% volumetric porosity). As the slag flows along the walls of the gasifier, it penetr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B41/85
CPCC04B2235/443C04B2235/3418C04B41/5007C04B41/87C04B41/5031C04B35/12C04B41/009C04B2235/3229C04B41/4535C04B2235/3217C04B35/657C04B2235/5454C04B2235/9669C04B2235/616C04B2235/77C04B2235/449C04B2235/3241C04B2235/3224B82Y30/00C04B41/85C04B2235/3244C04B41/455C04B41/5033C04B41/5045C04B41/5042C04B35/047C04B35/00C04B41/4539C04B41/4549C04B38/00
Inventor W·A·塔伯陈伟P·J·梅施特R·舒巴
Owner GENERAL ELECTRIC CO
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