Novel process of steelmaking deoxidization by utilizing precipitator dust of refining furnace

Abstract

The invention provides a novel process of steelmaking deoxidization by utilizing precipitator dust of a refining furnace, comprising the steps of 1, under the circumstance that the blowing process of a converter or an electric furnace is finished, the carbon end-point composition W[C] %=0.1-0.6% and the tapping temperature is 1580-1620 DEG C during the tapping, connecting the bottom to blow argon gas 2-4min before the tapping and carrying out gas stirring at the speed of 150-480L / min; and 2, after the tapping of the liquid steel in the converter or the electric furnace, starting to continuously add tons of steel aluminium blocks or alloy to carry out deoxidization, and when the quantity of the liquid steel is 7-17t in a steel ladle, starting to add the precipitator dust of the refining furnace along with the steel flow of the tapping of the furnace, wherein the adding quantity of the steel aluminium blocks or alloy is confirmed according to carbon content of the liquid steel before the tapping, the tapping time of the furnace is 2-8min, the adding of the precipitator dust of the refining furnace needs to be finished in 3-4min and the adding quantity is 1.2-6kg / ton of steel. According to the invention, the precipitator dust of the refining furnace is adopted as the deoxidizing agent, so that the novel process is suitable for silicon killed steel and silicon-aluminium killed steel.

Description

technical field [0001] The invention relates to the recycling and utilization of dedusting ash in a steelmaking plant. It is used as a deoxidizer for tapping for deoxidation operation during tapping of electric furnace and converter steelmaking. It has realistic environmental protection for reducing the consumption of smelting deoxidizer and optimizing the discharge of dedusting ash. significance. Background technique [0002] The dust ash produced in the middle of the dust collector of the LF refining furnace has a small particle size of less than 5mm, which is a kind of alkaline industrial waste. Therefore, in the process of hauling, the prevention and control of dust pollution has always been the main factor restricting the comprehensive utilization of dust ash. One, in order to eliminate the dust pollution problem of dust removal dust, the current steelmaking and refining dust removal dust is basically treated with humidification, that is, in the process of dust removal ...

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Problems solved by technology

(3) Zheng Xiancai, Yang Jun, and Li Qiang published the paper "Practice of Laiwu Iron and Steel Shaft Furnace Adding Steelmaking Dry Dust Removal and Fine Ash" in "Sintering Pellet" 2008 (3), expressing "during the production process, we noticed that When the amount of steelmaking dust removal reaches 7%, too little bentonite will cause serious bursting of raw pellets on the drying bed, which will affect the air permeability in the furnace, and will also make the pellet drum index, screening index, The compressive strength decreases and the output decreases significantly, therefore, the dosage should not be too high"; From the above information, it can be seen that there is no process for directly using the refining dust to make steel at present

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