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Metal composite anti-seepage unburned magnesia spinel brick for lining of refining furnace and preparation method thereof

A metal composite, magnesium spinel technology, applied in the field of chromium-free refractories, can solve the problems of failing to meet environmental protection requirements, pollute the environment, pollute the air, etc., and achieve energy saving and consumption reduction, high bulk density, low porosity. Effect

Active Publication Date: 2015-12-09
REFRACTORY MATERIAL OF SINOSTEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And hexavalent chromium is a carcinogen, harmful to human body and easily soluble in water, 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 to pollute the air and pollute the environment
Most of the refractory materials currently used contain chromium, which has great pollution to the environment, generally cannot meet the existing environmental protection requirements, and has problems such as low service life and polluted molten steel.

Method used

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  • Metal composite anti-seepage unburned magnesia spinel brick for lining of refining furnace and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Fused magnesia (MgO content at 97%) 84 parts, pre-synthesized fused spinel (Al 2 o 3 content in 70%) 10 parts, 6 parts of metal objects; the ratio of the addition of binder to the total weight of magnesia, pre-synthesized spinel and metal objects is: 3.1% of thermosetting phenolic resin is put into a strong sand mixer to pre- Mix for 25 minutes, and put the mixed material for use; weigh the mixed material according to the weight requirement, pour it into the pre-assembled mold, and perform high-pressure molding. After forming, measure according to the brick size requirements. Put the shaped bricks into the dryer for drying at room temperature -200°C for 28 hours; after the heat preservation is over, gradually lower the temperature for 10 hours, and then leave the oven after hardening to make this kind of metal composite for refining furnace lining. Anti-seepage non-fired magnesia spinel brick.

Embodiment 2

[0025] 45 parts of fused magnesia (98% MgO content), 40 parts of sintered magnesia (97% MgO content), pre-synthesized fused spinel (Al 2 o 3 content in 70%) 10 parts, 5 parts of metal objects; the ratio of the addition of binder to the total weight of magnesia, pre-synthesized spinel and metal objects is: 3.3% of thermosetting phenolic resin is put into a strong sand mixer to pre- Mix for 28 minutes, and put the mixed material for use; weigh the mixed material according to the weight requirement, pour it into the pre-assembled mold, and perform high-pressure molding. After forming, measure according to the brick size requirements. Put the shaped bricks into the dryer for drying at room temperature -210°C for 30 hours; after the heat preservation is over, gradually lower the temperature for 9 hours and leave the furnace after hardening to make this kind of metal composite for refining furnace lining. Anti-seepage non-fired magnesia spinel brick.

Embodiment 3

[0027] 65 parts of fused magnesia (95% MgO content), 21 parts of sintered magnesia (95% MgO content), pre-synthesized fused spinel (Al 2 o 3 content in 70%) 9 parts, 5 parts of metal objects; the ratio of the addition of binder to the total weight of magnesia, pre-synthesized spinel and metal objects is: 3.0% of thermosetting phenolic resin is put into a strong sand mixer to pre- Mix for 25 minutes, and put the mixed material for use; weigh the mixed material according to the weight requirement, pour it into the pre-assembled mold, and perform high-pressure molding. After forming, measure according to the brick size requirements. Put the formed bricks into the dryer for drying at room temperature -200°C for 29 hours; after the heat preservation is over, gradually lower the temperature for 6 hours, and then leave the oven after hardening to make this kind of metal composite for refining furnace lining. Anti-seepage non-fired magnesia spinel brick.

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Abstract

The invention discloses a metal composite impermeable and unfired magnesia spinel brick for a furnace liner of a refining furnace, and the magnesia spinel brick has the advantages of no chromium, excellent high-temperature performance, low porosity, strong corrosion resistance, good thermal shock stability and abrasive resistance, and excellent slag permeation resistance. In the invention, a main blank material is one or more of magnesite clinker (with the MgO content being more than or equal to 94%) and fused magnesite (with the MgO content being more than or equal to 94%), a pre-synthesized spinel (which is one or more of electrically-fused and sintered spinels and has the Al2O3 content of 60-90%) is added, one or more of 1-6 kinds of metals are used as an additive and an organic matter is used as a binding agent. The materials are mixed according to a proportion and then the mixture is molded under a high pressure; a molded brick blank is put into a dryer to be dried and then is discharged from a furnace after the model brick blank is hardened, so that the metal composite impermeable and unfired magnesia spinel brick is obtained.

Description

technical field [0001] The invention relates to a chrome-free refractory material for refining furnace lining. Specifically, it is a metal composite anti-seepage non-fired magnesia spinel brick and a preparation method thereof. Background technique [0002] Improving the comprehensive performance of steel materials and prolonging their service life is one of the main directions for the development of steel materials in the future, and adopting advanced clean steel smelting technology and continuously improving its technological level is an important way to achieve this goal; reasonable selection and correct use of high-quality High-quality refractories are an important guarantee for the realization of smelting clean steel smelting. [0003] Development history of RH refining function The working and mining conditions in the furnace are constantly harsh, and the progress of material technology has significantly improved the life of the furnace lining. However, in high temper...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
Inventor 张利新薄钧王玉霞
Owner REFRACTORY MATERIAL OF SINOSTEEL CORP