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Super-micro powder combined impervious spinel brick for refining furnace lining and preparation method

A spinel brick and refining furnace technology, applied in the field of chromium-free refractory materials, can solve the problems of failure to meet environmental protection requirements, environmental pollution, environmental pollution, etc., to improve thermal shock resistance, high temperature strength and high temperature wear resistance , good overall effect

Active Publication Date: 2015-04-08
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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  • Super-micro powder combined impervious spinel brick for refining furnace lining and preparation method
  • Super-micro powder combined impervious spinel brick for refining furnace lining and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Fused alumina-rich spinel (Al 2 o 3 % content ≥ 90%)) 63 parts, pre-synthesized spinel (single or composite use of fused and sintered spinel) 20 parts, alumina superfine powder 17 parts; The ratio of the total weight of the synthesized spinel to the metal is: binder 4%, pre-mixed in a strong mixer for 15 minutes, and the mixed material is used for later use; the mixed material is weighed according to the weight requirement and then poured into the pre-mixed In the assembled mold, carry out high-pressure molding; after forming, measure according to the size of the adobe, and test the indicators of the embryo body in time; put the formed adobe into the dryer for drying, the drying temperature is -180°C at room temperature, and the drying time is 31 hours ; Put the dried adobe into a high-temperature kiln for firing. After firing, the temperature is gradually lowered for 19 hours. After the temperature drops below 100°C, it is released from the furnace. After selection a...

Embodiment 2

[0029] Fused alumina-rich spinel (Al 2 o 3 % content ≥ 90%)) 64 parts, 20 parts of pre-synthesized spinel (single or composite use of electric fusion and sintered spinel), 16 parts of alumina superfine powder; The ratio of the total weight of the synthesized spinel to the metal is: 4.5% binder, pre-mixed in a strong mixer for 16 minutes, and the mixed material is ready for use; the mixed material is weighed according to the weight requirement and poured into the pre-mixed In the assembled mold, carry out high-pressure molding; after forming, measure according to the size of the brick, and test the indicators of the green body in time; put the formed brick into a dryer for drying, the drying temperature is -180 °C at room temperature, and the drying time is 33 hours ; Put the dried adobe into a high-temperature kiln for firing. After firing, the temperature is gradually lowered for 24 hours. After the temperature drops below 60°C, it is released from the furnace. After being ...

Embodiment 3

[0031] Fused alumina-rich spinel (Al 2 o 3% content ≥ 90%)) 65 parts, pre-synthesized spinel (single or composite use of fused and sintered spinel) 20 parts, alumina superfine powder 15 parts; The ratio of the total weight of the synthesized spinel to the metal is: 4.5% binder, pre-mixed in a strong mixer for 17 minutes, and the mixed material is used for later use; the mixed material is weighed according to the weight requirement and poured into the pre-mixed In the assembled mold, carry out high-pressure molding; after forming, measure according to the size of the brick, and test the indicators of the green body in time; put the formed brick into a dryer for drying at room temperature -180°C for 35 hours ; Put the dried adobe into a high-temperature kiln for firing. After firing, the temperature is gradually lowered for 25 hours. After the temperature drops below 50°C, it is released from the furnace. After being selected according to the size requirements, it is made into...

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Abstract

The invention discloses a super-micro powder combined impervious spinel brick and a preparation method. The spinel brick is chromium-free, excellent in high-temperature performance, good in thermal shock stability and abrasion resistance, excellent in slag penetration dissolution resistance and long in service life. The main blank material comprises 62 to 66 parts of electrically melted aluminum rich spinel, 19 to 23 parts of pre-synthesized spinel, and 13 to 17 parts of aluminum oxide micro powder; the adding quantity of a bonding agent is 3 to 5 percent of the total weight of the main blank material; and the spinel brick is formed by high-pressure molding and high-temperature activating and sintering.

Description

technical field [0001] The invention relates to a chrome-free refractory material for refining furnace lining. Specifically, it is an ultrafine powder combined anti-seepage 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 temperature an...

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
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