Aluminum silica sol composite combined aluminum silicon carbide castable and preparation method thereof

An aluminum-silica sol and aluminum-silicon carbide technology, which is applied in the field of refractory materials, can solve the problems of poor mechanical wear resistance and thermal shock resistance, poor bursting, low durability, etc., and achieves strong iron slag erosion resistance and thermal shock resistance. The effect of good performance and improved turnover efficiency

Active Publication Date: 2014-09-17
河南竹林耐材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it often results in low corrosion resistance and low durability, and it is difficult to meet the requirements of steel mills for long service life of ladles.
On the other hand, due to the low temperature strength of castables combined with calcium aluminate cement
Therefore, its resistance to mechanical wear and thermal shock stability are poor
In addition, since the castable combined with calcium aluminate cement also needs sufficient curing time and baking time, when it is quickly dried and baked, the castable is prone to cracks and bursts, which to some extent restricts the turnover efficiency of the ladle

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The aluminum-silica sol composite combined with the aluminum-silicon carbide castable of the present invention is expressed in weight percentage, and the raw material composition of the castable is: 12-8mm high-alumina bauxite aggregate 25%, 8-3mm high-alumina bauxite Aggregate 10%, 3~0mm high alumina bauxite aggregate 15%, 2 O 3 10% of micropowder; additionally add alumino-silica sol composite binder that accounts for 10% of the total weight of the above-mentioned raw materials.

[0027] The preparation method of the aluminum-silica sol composite binder is as follows: firstly, 30 wt% ρ-Al 2 O 3 The micropowder is uniformly dispersed in a 70wt% silica sol solution (the SiO in the silica sol solution is 2 The mass concentration of the silica sol solution is 30±1%, and the density of the silica sol solution is 1.19~1.21 g·cm -3 (20℃), SiO in silica sol solution 2 The particle size is 10-20nm), then add sodium tripolyphosphate accounting for 0.8% of the total weight ...

Embodiment 2

[0029] The aluminum-silica sol compound combined with the aluminum-silicon carbide castable of the present invention is expressed in weight percentage, and the raw material composition of the castable is: 12-8mm high-alumina bauxite aggregate 35%, 8-3mm high-alumina bauxite Aggregate 10%, 3~0mm high alumina bauxite aggregate 20%, 2 O 3 10% of micropowder; additionally add alumino-silica sol composite binder which accounts for 15% of the total weight of the above-mentioned raw materials.

[0030] The preparation method of the aluminum-silica sol composite binder is as follows: firstly, 30 wt% ρ-Al 2 O 3 The micropowder is uniformly dispersed in a 70wt% silica sol solution (the SiO in the silica sol solution is 2 The mass concentration of the silica sol solution is 30±1%, and the density of the silica sol solution is 1.19~1.21 g·cm -3 (20℃), SiO in silica sol solution 2The particle size is 10-20nm), and then add sodium hexametaphosphate accounting for 0.5% of the total weig...

Embodiment 3

[0032] The aluminum-silicon sol composite bonded aluminum silicon carbide castable of the present invention is represented by weight percentage, and the raw material composition of the castable is: 30% of 12-8mm high-alumina bauxite aggregate, 8-3mm high-alumina bauxite Aggregate 13%, 3-0mm high alumina bauxite aggregate 17%, 2 o 3 Micropowder 8%; In addition, add aluminum silica sol composite binder accounting for 12% of the total weight of the above raw materials.

[0033] The preparation method of the aluminum-silica sol composite binder is as follows: first, 30 wt% of ρ-Al 2 o 3 Micropowder is uniformly dispersed in the silica sol solution of 70wt% (in the silica sol solution, SiO 2 The mass concentration of silica sol solution is 30±1%, and the density of silica sol solution is 1.19~1.21 g cm -3 (20°C), SiO in silica sol solution 2 The particle size is 10-20nm), and then add sodium hexametaphosphate accounting for 1% of the total weight of the two raw materials, and...

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Abstract

The invention discloses an aluminum silica sol composite combined aluminum silicon carbide castable and a preparation method thereof. The castable is prepared from the following raw materials in percentage by weight: 25-35% of 12-8mm bauxite aggregate, 10-15% of 8-3mm bauxite aggregate, 15-20% of 3-0mm bauxite aggregate, 15-25% of <88 mu m corundum fine powder or alumina fine powder, 5-12% of <88 mu m SiC fine powder, 1-5% of <5 mu m silicon micropowder and 5-10% of <5 mu m alpha-Al2O3 micropowder. An aluminum silica sol composite binder accounting for 10-15 wt% of all the raw materials is also added. The castable has the characteristics of high moderate-temperature strength, favorable thermal shock resistance and high corrosion resistance, can implement flash baking, and enhances the turnaround efficiency of the iron ladle; and since the service life is doubled, the castable can effectively save the consumption of the refractory material.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to an aluminum-silicon sol composite bonded aluminum-silicon carbide castable and a preparation method thereof. Background technique [0002] The castables along the traditional ladle mostly use calcium aluminate cement-bonded high-alumina castables, or calcium aluminate cement-bonded A1 2 o 3 -SiC castable. Since calcium aluminate cement will introduce a certain amount of CaO, at high temperature CaO and Al in the castable 2 o 3 and SiO 2 It will react to form feldspar compounds with low melting point. Therefore, it often causes its low corrosion resistance and low durability, and it is difficult to meet the long-life service requirements of steel mills for ladles. On the other hand, due to the low temperature strength of castables combined with calcium aluminate cement. Therefore, its resistance to mechanical wear and thermal shock resistance are poor. In addi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 李志强彭从华刘飞飞李济华李焕成
Owner 河南竹林耐材有限公司
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