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High-oxidation-resistance non-cement bonded Al2O3-SiC-C refractory castable and preparation method thereof

A technology of refractory castables and oxidation resistance, which is applied in the field of unshaped refractory materials, can solve the problems of negative impact on the high-temperature mechanical properties and corrosion resistance of samples, failure to achieve good results, poor economic efficiency, etc., and achieve good oxidation resistance , Promote particle rearrangement and improve mechanical properties

Active Publication Date: 2021-04-06
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] From the above research results, it can be seen that with the development of smelting technology, the castable castables for iron troughs put forward higher requirements for the anti-oxidation technology of carbon raw materials, but at present, no good results have been achieved in anti-oxidation technology, and some non- Although the oxide has achieved some effects to a certain extent, its cost is high and its economy is poor, which has a certain negative impact on the high-temperature mechanical properties and corrosion resistance of the sample, thus limiting the popularization and application of the technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The high oxidation resistance non-cement binding Al of this embodiment 2 o 3 -SiC-C refractory castable, with weight percentage of 50.0wt% brown corundum aggregate, 17wt% silicon carbide, 5.0wt% spherical pitch, 7wt% corundum fine powder, 8wt% active α-alumina powder , 5.0wt% mullite sol, 4.0wt% silicon micropowder, 2.0wt% lithium feldspar and 2.0wt% metal aluminum powder / elemental silicon powder composite antioxidant as raw materials.

[0039] Among them, the particle gradation of the brown fused alumina aggregate is: 5-3mm accounts for 40wt% of the brown fused alumina aggregate, 3-1mm accounts for 35wt% of the brown fused alumina aggregate, and 1-0.088mm accounts for 25wt% of the brown fused alumina aggregate . The particle size composition of the silicon carbide is as follows: those of 1-0.088mm account for 60wt% of the silicon carbide, and those smaller than 0.088mm account for 40wt% of the silicon carbide. α-alumina fine powder selection Al 2 o 3 The content i...

Embodiment 2

[0047] The high oxidation resistance non-cement binding Al of this embodiment 2 o 3 -SiC-C refractory castable, with weight percentage of 60.0wt% brown corundum aggregate, 15wt% silicon carbide, 3.0wt% spherical pitch, 10wt% corundum fine powder, 5wt% activated α-alumina fine powder , 3.0wt% mullite sol, 2.0wt% silicon micropowder, 1.0wt% spodumene and 1.0wt% metal aluminum powder / elemental silicon powder composite antioxidant as raw materials.

[0048] Among them, the particle gradation of the brown fused alumina aggregate is: 5-3mm accounts for 50wt% of the brown fused alumina aggregate, 3-1mm accounts for 15wt% of the brown fused alumina aggregate, and 1-0.088mm accounts for 35wt% of the brown fused alumina aggregate . The particle size composition of the silicon carbide is as follows: those of 1-0.088mm account for 40wt% of the silicon carbide, and those smaller than 0.088mm account for 60wt% of the silicon carbide. α-alumina fine powder selection Al 2 o 3 The content...

Embodiment 3

[0056] The high oxidation resistance non-cement binding Al of this embodiment 2 o 3 -SiC-C refractory castable, with weight percentage of 54.0wt% brown corundum aggregate, 20wt% silicon carbide, 4.0wt% spherical pitch, 5wt% corundum fine powder, 10wt% active α-alumina powder , 3.0wt% mullite sol, 2.0wt% silicon micropowder, 0.5wt% lepidolite and 1.5wt% metal aluminum powder / elemental silicon powder composite antioxidant as raw materials.

[0057] Among them, the particle gradation of the brown fused alumina aggregate is: 5-3mm accounts for 30wt% of the brown fused alumina aggregate, 3-1mm accounts for 25wt% of the brown fused alumina aggregate, and 1-0.088mm accounts for 45wt% of the brown fused alumina aggregate . The particle size composition of the silicon carbide is as follows: those of 1-0.088mm account for 50wt% of the silicon carbide, and those smaller than 0.088mm account for 50wt% of the silicon carbide. α-alumina fine powder selection Al 2 o 3 The content is ≥ 9...

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Abstract

The invention discloses a high-oxidation-resistance non-cement-bonded Al2O3-SiC-C refractory castable and a preparation method thereof, and belongs to the field of amorphous refractory materials. The preparation method comprises the following steps: taking 50.0-60.0 wt% of brown fused alumina aggregate, 15.0-20.0 wt% of silicon carbide, 3.0-5.0 wt% of spherical asphalt, 5.0-10.0 wt% of corundum fine powder, 5.0-10.0 wt% of active alpha aluminum oxide micro powder, 3.0-5.0 wt% of mullite sol, 2.0-4.0 wt% of silicon micro powder, 0.5-2.0 wt% of lithium-containing aluminosilicate and 1.0-2.0 wt% of metal aluminum powder / monatomic silicon powder compound antioxidant as raw materials; and adding 0.20-0.30 wt% of a water reducing agent and 6-8wt% of water into the raw materials, carrying out stirring, pouring, molding, and subsequent heat treatment to obtain the high-oxidation-resistance non-cement-bonded Al2O3-SiC-C refractory castable for the large-scale blast furnace tapping channel. The prepared castable has extremely outstanding in oxidation resistance and excellent in normal-temperature / high-temperature mechanical property, thermal shock resistance and slag corrosion resistance, so that the safety coefficient and the service life of the tapping channel of the large blast furnace can be greatly improved, and the stable operation of the whole ironmaking process flow is guaranteed.

Description

technical field [0001] The present invention relates to the technical field of monolithic refractory materials, and more particularly to high oxidation resistance non-cement bound Al 2 o 3 -SiC-C refractory castable and preparation method thereof. Background technique [0002] In the international environment where global resources are scarce and the steel industry is fiercely competitive, it is imminent to explore high-efficiency, low-energy, and low-cost ironmaking processes. Due to the large high furnace (> 4000m 3 ) has production advantages such as relatively small footprint, less pollutant discharge, and low production cost, which have become a significant symbol of the development and progress of ironmaking technology. The blast furnace tapping trough is the channel that guides the flow of high-temperature molten iron and slag during the blast furnace tapping process, and is also the main area where refractory materials are consumed in the ironmaking process. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/103
CPCC04B35/103C04B2235/3826C04B2235/3463C04B2235/3418C04B2235/3472C04B2235/402C04B2235/428C04B2235/77C04B2235/96C04B2235/9669Y02P40/60
Inventor 李明晖童胜利倪薇李灿华黄贞益罗瀚李赛赛
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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