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Method for preparing high alumina castable without being moistened by aluminum liquid

A high-aluminum castable and molten aluminum technology, applied in the field of refractory castables, can solve problems such as insufficient homogenization, inability to completely and effectively solve the wetting problem, increase penetration resistance, and improve non-wetting by molten aluminum. , The effect of improving the penetration and corrosion resistance of molten aluminum

Active Publication Date: 2012-03-28
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are some reports in the literature at home and abroad, adding wetting agents that are not wetted by aluminum liquid, such as SiC, Si 3 N 4 , Cr 2 o 3 , BaSO 4 , CaSO 4 , CaF 2 etc. After adding these small amounts of additives, the problem of wetting of the castable by the aluminum liquid cannot be completely and effectively solved due to insufficient homogenization in the castable matrix, and the choice of Al 2 o 3 High content, SiO 2 Castables with lower content were used as research objects

Method used

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  • Method for preparing high alumina castable without being moistened by aluminum liquid
  • Method for preparing high alumina castable without being moistened by aluminum liquid
  • Method for preparing high alumina castable without being moistened by aluminum liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0022] A kind of preparation method of high-alumina castable that is not wetted by aluminum liquid prepares Al 2 o 3 A refractory castable with a content of 40-55%. The composition of the castable is 63wt% of burnt sapphire particles, 16wt% of burnt sapphire fine powder, 5wt% of silicon oxide micropowder, 6wt% of anti-aluminum liquid wetting agent (BaSO 4 4.8wt%, Na 3 AlF 6 1.2wt%), pure calcium aluminate cement 10wt%, plus 0.15% sodium tripolyphosphate, plus 0.05wt% sodium hexametaphosphate. First, burnt gemstone fine powder, BaSO 4 and Na 3 AlF 6 16wt%: 4.8wt%: 1.2wt% were co-milled and homogenized for 25 minutes, and then the co-milled homogenized material was pressed as coke gem powder, BaSO 4 and Na 3 AlF 6 The proportion shared in the castable and other components in the castable are uniformly mixed with a forced mixer, that is, a high-alumina castable that is not wetted by the aluminum liquid is prepared.

[0023] The pouring material of the present invention ...

Embodiment 2

[0025] A kind of preparation method of high-alumina castable that is not wetted by aluminum liquid prepares Al 2 o 3 A refractory castable with a content of 40-55%. The composition of castable is 64wt% of tertiary bauxite particles, 20wt% of tertiary bauxite fine powder, 7wt% of silica micropowder, 2wt% of alumina micropowder, 1wt% of anti-aluminum liquid wetting agent (BaSO 4 0.8wt%, Na 3 AlF 6 0.2wt%), pure calcium aluminate cement 6wt%, plus 0.12% sodium tripolyphosphate, plus 0.03wt% sodium hexametaphosphate. First, the three-grade bauxite fine powder, BaSO 4 0.8wt% and Na 3 AlF 6 0.2wt% barium salt was co-milled and homogenized at 20wt%: 0.8wt%: 0.2wt% for 30 minutes, and then the co-milled homogenized material was poured according to the proportion of three-grade alumina fine powder and barium salt in the castable The other components in the material are mixed evenly with a forced mixer. That is, a high-alumina castable that is not wetted by the aluminum liquid i...

Embodiment 3

[0028] A kind of preparation method of high-alumina castable that is not wetted by aluminum liquid prepares Al 2 o 3 A refractory castable with a content of 56-75%. The composition of the castable is 64wt% of tertiary alumina particles, 21wt% of mullite fine powder, 5wt% of silica micropowder, 2wt% of alumina micropowder, 3wt% of anti-aluminum liquid wetting agent (BaSO 4 2.4wt%, Na 3 AlF 6 0.6wt%), pure calcium aluminate cement 5wt%, plus 0.09% sodium tripolyphosphate, plus 0.05wt% sodium hexametaphosphate. First, the mullite fine powder and barium salt were co-milled and homogenized at 21wt%: 3wt% for 30 minutes, and then the co-milled homogenized material was mixed according to the proportion of mullite fine powder and barium salt in the castable and the castable The other components in the mixture were mixed evenly with a forced mixer. That is, a high-alumina castable that is not wetted by the aluminum liquid is prepared.

[0029] The pouring material of the present ...

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Abstract

The invention discloses a method for preparing a high alumina castable without being moistened by aluminum liquid. The high alumina castable comprises the following raw materials in percentage by weight: 63 to 70 percent of high alumina granular materials, 16 to 23 percent of high alumina fine powder, 3 to 7 percent of silicon oxide micropowder, 0 to 7 percent of aluminum oxide micropowder, 3 to 10 percent of pure calcium aluminate cement and 1 to 6 percent of aluminum liquid moisture resistant agent consisting of BaSO4 and Na3AlF6. The preparation method comprises the following steps of: grinding the aluminum liquid moisture resistant agent and the high alumina fine powder according to the weight percentage in a vibration mill for 20 to 30 minutes; and uniformly mixing the obtained homogenized powder and other components. In the preparation method, the aluminum liquid moisture resistant agent and the high alumina fine powder are subjected to homogenization treatment, and then the homogenized powder is added to the high alumina castable; the content of Al2O3 in the prepared high alumina castable is improved to 90 percent from 40 percent; and the non-wettability of the high aluminarefractory castables to aluminum liquid is obviously strengthened.

Description

technical field [0001] The invention belongs to the technical field of refractory castables, and in particular relates to a method for preparing high-alumina castables that are not wetted by molten aluminum. technical background [0002] Aluminum smelting furnace is an important high-temperature equipment for deep processing of aluminum to melt molten aluminum and perform aluminum alloying treatment. The quality of its refractory lining is directly related to the control of aluminum alloy composition and the safety of furnace operation. Although the temperature of molten aluminum and aluminum alloying in the aluminum smelting furnace is only 700-900°C, the magnesium and zinc in metal aluminum and aluminum alloys are highly active, and they are easy to react with some components in refractory materials and suffer from refractory conditions. Material pollution; the viscosity of molten aluminum at 750°C is only 0.104Pa·s, which is quite close to the viscosity of water at 20°C (...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/103C04B35/14C04B35/622
Inventor 张三华王战民曹喜营胡书禾石会营李少飞王文斌
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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