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A kind of unfired magnesia alumina spinel brick

A technology of magnesia-alumina-spinel brick and magnesium-rich-alumina-magnesia spinel, which is applied in the field of refractory materials, can solve the problems of poor corrosion resistance and low service life, and achieve high-temperature strength, erosion resistance, and good thermal shock performance , Good anti-slag erosion effect

Active Publication Date: 2015-08-26
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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  • A kind of unfired magnesia alumina spinel brick
  • A kind of unfired magnesia alumina spinel brick
  • A kind of 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 8-10mm, magnesium-rich aluminum-magnesium spinel powder, alumina micropowder, aluminum-silicon alloy powder and B 4 C, using a binder silicone resin and phenolic resin to combine together, followed by kneading, molding and drying 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 unfired magnesia-aluminum spinel brick described in this technical solution has an apparent porosity of 3-5%, a comp...

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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 achieved. 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 Patents(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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