Magnesium spinel brick, production method of magnesium spinel brick, and method for preparing RH furnace circulation pipe by using magnesium spinel brick

A technology of magnesia spinel and brick products, which is applied in the field of magnesia spinel circulating pipes for RH furnaces and its manufacture, can solve the problems of high melting loss rate, unsuitable life of dipping pipes, and affecting the longevity of RH furnaces, etc. Achieve the effects of low production energy consumption, good thermal strength and thermal shock resistance

Inactive Publication Date: 2012-08-08
ZHEJIANG ZILI CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the circulating pipe is more scoured by molten steel than the dipping pipe, and it is hidden inside the RH furnace, the spraying effect of the external gunning material is not as good as that of the dipping pipe, resulting in a higher melting rate, so it does not match the life of the dipping pipe , become the bottleneck affecting the longevity of the RH furnace

Method used

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  • Magnesium spinel brick, production method of magnesium spinel brick, and method for preparing RH furnace circulation pipe by using magnesium spinel brick
  • Magnesium spinel brick, production method of magnesium spinel brick, and method for preparing RH furnace circulation pipe by using magnesium spinel brick
  • Magnesium spinel brick, production method of magnesium spinel brick, and method for preparing RH furnace circulation pipe by using magnesium spinel brick

Examples

Experimental program
Comparison scheme
Effect test

Embodiment l

[0028] A kind of magnesia spinel brick, the preparation raw material of this brick is made up of the raw material component of following table:

[0029]

[0030] Accurately weigh magnesia, magnesia-aluminum spinel powder, metal Al powder, metal Si powder and saturated calcium lignosulfonate solution (25°C) according to the ratio in the above table and mix them evenly in a wet mill , machine-pressed, and baked at 180°C-250°C to prepare magnesia spinel bricks, then polish the magnesia spinel bricks, and use magnesia-aluminum fireclay to bond them into a ring, and use iron hoops on the outside prison.

[0031] The magnesium spinel circulation tube produced by this formula is used in the RH furnace of a steel factory. The original working layer thickness is 180mm. After smelting 60 furnaces, the residual thickness is 110mm-120mm, which is synchronized with the life of the dipping tube; while the magnesium The residual thickness of the chromium circulation tube after reaching t...

Embodiment 2

[0033] Magnesium spinel circulation tube for RH furnace, the weight percentage of each component is:

[0034]

[0035] The magnesia, magnesium aluminum spinel micropowder, metal Al powder, metal Si powder and sodium humate saturated solution (25°C) with different particle sizes are accurately weighed according to the proportion, mixed and rolled evenly in a wet mill, and machine pressed into shape. And baked at 180°C-250°C to prepare magnesia spinel bricks, then polish the magnesia spinel bricks, and use magnesia-aluminum fireclay to bond into a ring, and the outside is fastened with iron hoops.

[0036] The magnesium spinel circulation tube produced by this formula is used in the RH furnace of a steel factory. The original working layer thickness is 150mm. The residual thickness of the chromium circulation tube after reaching the same service life is 90mm-100mm, while the corundum spinel circulation tube can only be used in 90 furnaces, and the residual thickness of the of...

Embodiment 3

[0038] Magnesium spinel circulation tube for RH furnace, the weight percentage of each component is:

[0039]

[0040] The magnesia, magnesia aluminum spinel powder, metal Al powder, metal Si powder and phenolic resin with different particle sizes are accurately weighed according to the ratio, and then mixed and rolled evenly in a wet mill, machine pressed and formed, and subjected to 180°C-250°C Bake to prepare magnesia spinel bricks, then polish the magnesia spinel bricks, and use magnesia-aluminum fireclay to bond them into a ring, and use iron hoops to fasten the outside.

[0041] The magnesia spinel circulation tube produced by this formula is used in the RH furnace of a steel factory. The original working layer thickness is 200mm. After smelting 80 furnaces, the residual thickness is 110mm ~ 120mm, reaching the same service life as the magnesium chromium circulation tube. The residual thickness after the off-line is equivalent to the life of the dipping tube; the coru...

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Abstract

The invention discloses a magnesium spinel brick. The brick is prepared by raw materials consisting of the following components: 71 wt%-78 wt% of fused magnesia having a particle size of 8-0mm; 8 wt%-12 wt% of fused magnesia having a fineness which is less than or equal to 0.088mm; 7 wt%-14 wt% of magnesium-aluminum spinel micro power having a fineness of D50 which is less than or equal to 5mum; 1 wt%-3 wt% of metal Al power having a fineness which is less than or equal to 0.088mm; 0.5 wt%-1.5 wt% of metal Si power having a fineness which is less than or equal to 0.088mm; and an organic bonding agent accounting for 2%-5% of the total weight of the above mentioned components. The method for preparing the magnesium spinel brick of the invention comprises the following steps: accurately weighting the fused magnesia, the magnesium-aluminum spinel micro power, the metal Al power, the metal Si power and the organic bonding agent in the proportion described above, and uniformly mixing and grinding the components in a wet grinding machine; shaping the mixture by compressing the mixture in a press; and performing baking at a temperature of 180 DEG C-250 DEG C to obtain a finished magnesium spinel brick product. After the finished magnesium spinel brick products are abraded, the abraded products are bonded into a ring by using magnesium-aluminum chamotte, and the ring is hooped firmly by using an iron hoop on the outside of the ring. A RH furnace circulation pipe prepared by using the magnesium spinel bricks of the invention has a good melting loss resistance performance, has service life which is synchronized with that of an impregnating tube, and realizes long life effect of the whole RH furnace.

Description

technical field [0001] The invention relates to the field of refractory materials for iron and steel metallurgy, in particular to a magnesia spinel circulation pipe for an RH furnace and a manufacturing method thereof. Background technique [0002] With the advancement of world science and technology and the needs of national economic development, the output of high value-added steel grades continues to rise. RH furnace refining treatment needs to undertake vacuum decarburization, oxygen blowing decarburization, powder spraying desulfurization, temperature compensation, uniform molten steel temperature and composition, etc. With multiple functions, its lining refractory materials have been subjected to rapid cooling and rapid heating, strong impact force, high vacuum conditions, and strong chemical effects of various alkalinity slag and alloy components for a long time. The service conditions are very harsh, and only ultra-high temperature firing The finished magnesia-chrome...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/622
Inventor 方斌祥王强吴斌薛军柱程文雍张炳
Owner ZHEJIANG ZILI CORP LTD
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