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

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...

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

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