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Corundum spinel castable with micro-nano pore structure and preparation method of corundum spinel castable

A corundum spinel and castable technology, which is applied in the field of corundum spinel castable with micro-nano pore structure and its preparation, can solve the problem that the stability of size and quantity cannot be guaranteed, increase production cost, increase material price, etc. problems, to achieve the effect of improving thermal shock stability, prolonging service life and improving flow performance

Inactive Publication Date: 2015-03-25
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: (1) when the temperature changes sharply, the ZrO 2 Martensitic transformation occurs, volume changes occur, and microcracks occur, but the stability of the size and number of cracks is difficult to guarantee; (2) ZrO 2 The price is expensive, from the perspective of economic interests, the introduction of ZrO through different sources of zirconium 2 Significantly increased production costs and increased material prices
However, the nano dolomite used in this technology is easy to suspend in the air, causing air pollution and affecting human health.

Method used

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  • Corundum spinel castable with micro-nano pore structure and preparation method of corundum spinel castable
  • Corundum spinel castable with micro-nano pore structure and preparation method of corundum spinel castable
  • Corundum spinel castable with micro-nano pore structure and preparation method of corundum spinel castable

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A corundum spinel castable with micro-nano pore structure and a preparation method thereof. With 45~56wt% tabular corundum particles and 12~15wt% magnesium aluminum spinel particles as aggregate, 7~10wt% magnesium aluminum spinel fine powder, 10~12wt% corundum fine powder, 12 ~15wt% α-Al 2 o 3 Micropowder, 6~8wt% pure calcium aluminate cement and 0.4~0.5wt% SiO 2 The micropowder is a powder; dry mix the aggregate for 5-15 minutes to make a mixed aggregate, dry mix the powder for 3-5 minutes to make a mixed powder; then add 0.1-0.2 Wt% of ADS, 0.7~0.8wt% of ADW, 4.2~4.5wt% of water and 5~7.5wt% of foam, stirred for 3~5 minutes to make a mixed mud; then pour the mixed aggregate into the mixed mud , stirred for 1.5-4.5 minutes, vibrating casting, curing for 18-28 hours, and demoulding; baked at 100-120°C for 18-28 hours, heated to 1450-1550°C, and kept for 2-3 hours, that is, micro-nano Corundum spinel castable with porous structure.

[0033] In this embodiment: the c...

Embodiment 2

[0036] A corundum spinel castable with micro-nano pore structure and a preparation method thereof. With 56~64wt% tabular corundum particles and 8~13wt% magnesium aluminate spinel particles as aggregate, 5~8wt% magnesium aluminate spinel fine powder, 8~10wt% corundum fine powder, 10 ~12wt% α-Al 2 o 3 Micropowder, 5~6wt% pure calcium aluminate cement and 0.3~0.4wt% SiO 2 The micropowder is a powder; dry mix the aggregate for 5-15 minutes to make a mixed aggregate, dry mix the powder for 3-5 minutes to make a mixed powder; then add 0.1-0.2 Wt% of ADS, 0.5~0.6wt% of ADW, 4.0~4.2wt% of water and 7.5~10wt% of foam, stirred for 3~5 minutes to make a mixed mud; then pour the mixed aggregate into the mixed mud, Stir for 1.5~4.5 minutes, vibrate casting, curing for 18~28 hours, demoulding; bake at 100~120°C for 18~28 hours, heat up to 1550~1600°C, keep warm for 2.5~3.5 hours, then you can get micro-nano pores Structural corundum spinel castables.

[0037] In this embodiment: the co...

Embodiment 3

[0040] A corundum spinel castable with micro-nano pore structure and a preparation method thereof. With 64~72wt% of tabular corundum particles and 4~9wt% of magnesium aluminate spinel particles as aggregate, 3~7wt% of magnesium aluminate spinel fine powder, 6~9wt% of corundum fine powder, 7 ~10wt% α-Al 2 o 3 Micropowder, 4~5wt% pure calcium aluminate cement and 0.2~0.3wt% SiO 2 The micropowder is powder; dry mix the aggregate for 5-15 minutes to make mixed aggregate, dry mix the powder for 3-5 minutes to make mixed powder; then add 0.4-0.6 Wt% ADW, 3.7~4.0wt% water and 10~12.5wt% foam, stir for 3~5 minutes to make a mixed slurry; then pour the mixed aggregate into the mixed slurry, stir for 1.5~4.5 minutes, vibrate Casting molding, curing for 18-28 hours, demoulding; baking at 100-120°C for 18-28 hours, heating up to 1550-1650°C, and keeping warm for 2.8-3.8 hours to obtain corundum spinel casting with micro-nanoporous structure material.

[0041] In this embodiment: the ...

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Abstract

The invention relates to a corundum spinel castable with a micro-nano pore structure and a preparation method of the corundum spinel castable. The technical scheme of the invention is as follows: the preparation method comprises the following steps of: dry-blending 45-82 percent by weight of tabular corundum particles and 1-15 percent by weight of magnesium aluminate spinel particles to obtain mixed aggregate, and dry-blending 1-10 percent by weight of magnesium aluminate spinel fine powder, 4-12 percent by weight of corundum fine powder, 5-15 percent by weight of Alpha-Al2O3 micropowder, 2-8 percent by weight of pure calcium aluminate cement and 0.1-0.5 percent by weight of SiO2 micropowder to obtain mixed powder; then adding a water reducing agent, water and foams which respectively account for 0.2-1.0 percent by weight, 3.5-4.5 percent by weight and 5-15 percent by weight of the aggregate and the powder to the mixed powder, and stirring to prepare mixed slurry; and pouring the mixed aggregate into the mixed slurry, stirring, moulding by casting, curing, demoulding, baking, heating to 1450-1760 DEG C and maintaining the temperature for 2-4 hours. The preparation method disclosed by the invention has the characteristics of simple process and easiness for construction and industrial production; and the prepared corundum spinel castable is high in comprehensive property, good in thermal shock resistance and long in service life.

Description

technical field [0001] The invention belongs to the technical field of corundum spinel castables, and in particular relates to a corundum spinel castable with a micro-nano pore structure and a preparation method thereof. technical background [0002] With the development of the modern steelmaking industry, the smelting conditions of the ladle are becoming increasingly harsh, and the requirements for the use of refractory materials used in the lining of the ladle are becoming more and more stringent. It is difficult for the castables of traditional materials to meet the needs of technological progress. Therefore, it is imperative to develop new high-performance castables for ladles. Corundum-spinel castables have been widely used due to their good high-temperature performance, and have been popularized in Japan and other countries. With the technical progress of refractory materials and the improvement of refractory material requirements of steelmaking process, especially ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
Inventor 赵雷陈欢陈辉雷中兴方伟李远兵李淑静
Owner WUHAN UNIV OF SCI & TECH
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