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Unfired magnesia-alumina spinel brick

The technology of magnesia-aluminum spinel brick and rich magnesia-aluminum-magnesium spinel is applied in the field of refractory materials, which can solve the problems of low service life and poor corrosion resistance, achieve good thermal shock performance, improve high temperature strength and anti-scour performance , the effect of improving antioxidant properties

Active Publication Date: 2014-02-12
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Domestic RH refining furnaces also use corundum spinel prefabricated bricks for the dipping tube and lower tank of RH furnaces, but their corrosion resistance is worse than that of magnesia-chrome bricks, and their service life is lower than that of magnesia-chrome bricks

Method used

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  • Unfired magnesia-alumina spinel brick
  • Unfired magnesia-alumina spinel brick
  • Unfired magnesia-alumina spinel brick

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-6

[0027] Table 2 shows the ratio of each chemical component in the embodiment 1-6 of the technical solution.

[0028] Table 2 (wt%)

[0029]

[0030] In each of the specific examples above, the high-purity fused magnesia material with a particle size of 8-10 mm, magnesium-rich aluminum-magnesium spinel powder, alumina micropowder, aluminum-silicon alloy powder and B 4 C, use the binder silicone resin and phenolic resin to combine together, then knead, shape and dry to make the non-fired magnesium aluminum spinel brick of the present invention.

[0031] Table 3 shows the properties of the non-burned magnesia spinel bricks in Examples 1-6.

[0032] table 3.

[0033]

[0034] *Note: High temperature flexural strength test temperature is 1400°C, non-oxidizing atmosphere, heat preservation for 1 hour.

[0035] It can be seen from Table 3 that the non-fired magnesia-aluminum spinel brick described in this technical solution has an apparent porosity of 3-5%, a compressive stre...

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Abstract

The invention discloses an unfired magnesia-alumina spinel brick. The unfired magnesia-alumina spinel brick comprises the following chemical components by mass: 80 to 90% of fused magnesia, 5 to 15% of magnesium-rich magnesia-alumina spinel, 1 to 3% of micro alumina powder, 1 to 3% of aluminum-silicon alloy powder and 0.2 to 0.6% of B4C. The chemical components are bonded together by using 3.5 to 5 wt% of an added binder. The content of magnesium oxide in the fused magnesia is greater than 98 wt%, and the content of magnesium oxide in the magnesium-rich magnesia-alumina spinel is greater than 30 wt%. The unfired magnesia-alumina spinel brick provided by the invention has excellent slag reaction resistance, slag penetration resistance, anti-stripping performance, anti-scouring performance, resistance to oxidation and a long service life, does not include the harmful element--chromium, avoids pollution and harm to human beings and the environment, needs low production cost and has a wide application scope.

Description

technical field [0001] The invention relates to a refractory material, in particular to a chrome-free refractory material. Background technique [0002] At present, the lining of RH refining furnaces in the iron and steel industry has always been made of chromium-containing basic refractory materials, and good results have been obtained. In high temperature and alkaline environment, Cr 2 o 3 Refractories in an oxidizing atmosphere with such as Na 2 O, K 2 In the presence of strong basic oxides such as O or CaO, Cr 3+ can be oxidized to Cr 6+ . Cr 6+ It is a carcinogen, harmful to human body and easily soluble in water; while Cr 2 o 3 It can exist in the gas phase, and will be discharged into the air with the flue gas during production and use, polluting the air and the environment. In addition, K 2 CrO 4 , CaCrO 4 Soluble in water, Cr in residual bricks after use 6+ It dissolves along with rainwater and infiltrates into the ground, which will cause water pollut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 金从进赵明李泽亚沈钟铭何平显王峰刘继鸣
Owner BAOSHAN IRON & STEEL CO LTD
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