Technology for fabricating foaming slag in arc furnace molten pool

Abstract

The invention discloses a technology for fabricating foaming slag in an arc furnace molten pool. The technology comprises the following steps: using a powder spraying tank and a powder spraying tank conveying pipeline to spray carbon powder containing powder material for producing foaming slag, into an arc furnace, controlling the slag alkalinity, FeO content, and molten pool temperature, wherein the carbon powder containing powder material for producing foaming slag is a graphite-like material, the fixed carbon content is not less than 80%, the water content is not more than 0.5%, the particle size is less than 3 mm; and continuously and evenly spraying the graphite-like material to the slag surface in the arc furnace to produce foaming slag when the temperature of the arc furnace molten pool reaches 1550 to 1600; wherein the spraying pressure is 0.3 to 0.5 MPa, the spraying strength is 15 to 25 kg / min, and the spraying amount is 6 to 7 kg / t. The graphite-like powder material is adopted to avoid the wear on the powder spraying tank conveying pipeline. Under an iron / water ratio of 30 to 75%, foaming slag operation during the whole process can be achieved, and the using amount of graphite-like material is reduced by 20% or more, compared to that of carbon powder. The graphite-like material is safer than the coke, and the service life of the conveying pipeline is prolonged.

Description

technical field [0001] The invention relates to a process for forming foam slag in an electric arc furnace molten pool, and belongs to the technical field of electric arc furnace smelting. Background technique [0002] In the smelting process of UHP electric arc furnace, it is one of the most important process technologies to create good foamy slag in the molten pool. The foam slag technology is to spray carbon powder into the molten pool while blowing oxygen during the smelting process of the electric arc furnace to form a strong carbon-oxygen reaction and form a large amount of CO gas bubbles in the slag layer. Foam slag can effectively shield and absorb arc radiation energy, and transfer it to the molten pool, improve heat transfer efficiency, reduce heat loss radiated to furnace lining and furnace cover, increase the temperature of molten steel quickly, reduce refractory material consumption and smelting power consumption, Improve the metallurgical reaction speed and sh...

AI Technical Summary

Problems solved by technology

The existing problem is that the fluidized coke powder has a huge impact and friction on the conveying pipeline, and the hardness of the coke powder is high, resulting in serious wear and tear of the conveying pipeline, so that the spare parts of the conveying pipeline are often replaced

The second is that the particle size of coke powder is uneven, and large particles of coke often block the conveying pipeline, which affects the normal formation of foam slag

The third is that the particle size and composition of coke powder are uneven, the foaming speed is slow, the effect is unstable, and the smoke is large

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