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Silicon-corundum-high-titanium mullite composite refractory material for blast furnace and preparation method of silicon-corundum-high-titanium mullite composite refractory material

A refractory material, mullite technology, applied in the field of refractory materials, can solve the problems of unresolved safety hazards at the bottom of the hearth and large materials, and achieve the effects of excellent oxidation resistance and low production costs

Active Publication Date: 2022-05-10
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

TiO2 is reduced and dissolved in molten iron to form Ti, and when the temperature drops, it forms Ti(C,N) solid solution with C and N, precipitates and deposits on the hearth lining, but this method consumes a lot of materials , and when the addition of titanium-containing materials is stopped, the formation of the Ti(C,N) protective layer will stop, and the safety hazard at the bottom of the hearth has not been eliminated.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: A method for preparing a high-performance silicon-corundum-high-titanium mullite composite refractory material for blast furnaces. In terms of weight percentage, the raw material composition is: 33% tabular alumina with a particle size of 4-1mm, and 10% with a particle size 1-0.5mm tabular alumina, 20% tabular alumina with a particle size of 0.5-0mm, 2% high-titanium fused mullite with a particle size of 4-1mm, 32% high-titanium fused mullite with a particle size less than or equal to 75μm Laishi, 3% metal silicon powder with particle size less than or equal to 45μm, plus 3% of the above total amount of resin powder and ethylene glycol as a binder.

[0019] During production, the raw materials are mixed according to the ratio, and the mud is obtained after mixing, and then pressed into shape, at 1300 ° C, N 2 The silicon-corundum-high-titanium mullite composite material was made by sintering for 8 hours under the condition of atmosphere and presence of solid ...

Embodiment 2

[0021] Embodiment 2: production process is identical with embodiment 1, and difference is:

[0022] In terms of weight percentage, the raw material composition is: 31% tabular alumina with a particle size of 4-1mm, 10% tabular alumina with a particle size of 1-0.5mm, 20% tabular alumina with a particle size of 0.5-0mm, and 4% with a particle size of 4-1mm high-titanium fused mullite, 29% high-titanium fused mullite with a particle size of 75 μm or less, 6% metal silicon powder with a particle size of 45 μm or less, plus 3% of the above-mentioned total resin powder and ethylene glycol Alcohol is the binding agent.

[0023] The performance index of the obtained product is: apparent porosity 17.4%, bulk density 2.90g / cm 3 , The room temperature compressive strength is 154MPa.

Embodiment 3

[0024] Embodiment 3: production process is identical with embodiment 1, difference is:

[0025] In terms of weight percentage, the raw material composition is: 29% tabular alumina with a particle size of 4-1mm, 10% tabular alumina with a particle size of 1-0.5mm, 20% tabular alumina with a particle size of 0.5-0mm, and 6% with a particle size of 4-1mm high-titanium fused mullite, 26% high-titanium fused mullite with a particle size of 75 μm or less, 9% metal silicon powder with a particle size of 45 μm or less, plus 3% of the above-mentioned total resin powder and ethylene glycol Alcohol is the binding agent.

[0026] The performance index of the obtained product is: apparent porosity 16.7%, bulk density 2.92g / cm 3 , The room temperature compressive strength is 183MPa.

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Abstract

The invention discloses a silicon-corundum-high-titanium mullite composite refractory material for a blast furnace and a preparation method, and belongs to the field of refractory materials. Metal silicon powder, high-titanium fused mullite and tabular corundum are used as raw materials, and resin powder and ethylene glycol are used as binding agents. Wherein titanium in the electric smelting mullite raw material exists in the form of a Ti2O3 independent phase. During production, the raw materials are weighed according to the proportion and mixed to obtain pug, and the pug is subjected to compression molding and sintered for 6-12 h at the temperature of 1100-1450 DEG C in the N2 atmosphere in the presence of solid carbon. The apparent porosity of the obtained product is 10-20%, the volume density is 2.70-3.05 g / cm < 3 >, the normal-temperature compressive strength is 70-230 MPa, and the product has good thermal shock resistance and erosion resistance. According to the prepared silicon-corundum-high titanium mullite composite refractory material for the blast furnace, a transition plastic phase process is utilized, metal silicon powder is added into the refractory material, a non-oxide reinforced phase (SiC, O '-Sialon) with excellent performance is generated in situ, and Ti (C, N) with an obvious furnace protection effect can be generated in the composite material in situ without additionally adding a titanium source.

Description

technical field [0001] The invention belongs to the technical field of refractory materials. Specifically relates to a silicon-corundum-high titanium mullite composite refractory material for blast furnaces and a preparation method thereof. Background technique [0002] The iron and steel industry is a basic industry for the development of the national economy, and blast furnace ironmaking is currently the main method of ironmaking. my country's iron and steel production is increasing year by year, so the longevity and large-scale of blast furnaces are the main goals to be achieved by iron smelters. The blast furnace lining material is an important factor affecting the life of the blast furnace. Blast furnace linings must be continuously eroded by molten iron and slag, which requires lining materials to have good corrosion resistance and thermal shock resistance, and traditional oxide refractory materials have been difficult to meet the demand. [0003] With Hong Yanruo's...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/103
CPCC04B35/103C04B2235/3463C04B2235/3232C04B2235/428C04B2235/77C04B2235/96C04B2235/9607
Inventor 李勇岳茜马晨红李红霞
Owner UNIV OF SCI & TECH BEIJING
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