SU1057568A1 - Slag-forming mix - Google Patents

Description

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SP

Od 00 The invention relates to ferrous metallurgy, in particular to the refining of steel with slag-forming mixtures. The known slag-forming mixture for treating molten steel on the basis of ferromanganese with the addition of aluminum, fluorspar and lime is compressed on a hydrocarbon bond into a briquette with a component content, weight: Aluminum1-0 Fluorite spar 0.5-6 Lime 0.5 Ferromanganese 50-98 Despite the fact that the mixture has deoxidizing properties, it has relatively low desulfurizing and dephosphorizing properties. The closest to the offer is a slag-forming mixture containing lime, a hydrocarbon-containing material, New spar, ferromanganese, graphite and iron oxide in the following ratio of components, weight: Lime 69-85 Iron oxides 3 8 Graphite2-5 Fluorspar Hydrocarbon-containing material 2-3 Ferromanganese, A disadvantage of the known slag-forming mixture is its high cost due to use scarce materials: plaster spar, graphite. The purpose of the invention is to increase the refining capacity and reduce its cost. This goal is achieved by the fact that a slag-forming mixture containing lime, a hydrocarbon-containing material, ferromanganese, additionally contains top dust in the following ratio of components, wt .: Ferromanganese 3-8 Hydrocarbon-containing material 0.2-1.8 Kolodnikova dust 5-25 Lime Rest Koloshnikov The dust has the following chemical composition, May .: silicon oxide 8-12, aluminum oxide li, iron oxide 40-55, ferrous oxide, 10-20, calcium oxide, magnesium oxide 1-5, manganese oxides 0.3-2.5 , oxides of carbon 5-10, other oxides the rest. Content to mix in the amount of 67-90 weight. due to the best conditions for refining steel. When the lime content in the mixture is less than 67 wt.%, The basicity of the formative forms in the steelmaking slag aggregate decreases, which leads to a deterioration in the removal of sulfur and phosphorus from the metal, and when the content of lime in the mixture is more than 90 wt. the liquid mobility of the formed slags deteriorates, then their reactivity decreases. By reducing ferro-manganese in a mixture of less than 3 wt. the degree of metal refining by the mixture decreases, and the increase in the content of ferromanganese in the mixture is more than 8 wt. economically impractical. Hydrocarbon-containing materials in the amount of 0.2-1.8 wt.% Improve the process of briquetting the mixture at a pressure of 6 kg; . pressing 2-5-10 7 Reducing the content of hydrocarbon-containing materials less than 0.2 weight. does not guarantee obtaining a durable bakecafa from the mixture of the proposed composition at a pressing pressure of less. 2 1 0 --j-jj, and the content of hydrocarbon-containing materials in omesis is more than 1.8% by weight with large pressing forces economically impractical. When the flue dust content in the mixture is less than 5 weight L, the rate of lime dissolution in the slag decreases, which slows down the process of metal refining by the mixture, and when the flue dust content in the mixture exceeds 25%, the basicity of the forming slag decreases, which leads to deterioration of the metal desulfurization process. The mixture is made as follows. Dusty waste from the production of lime from kilns, flue dust, as well as sifting out of the small i fraction of the crushing of ferromanganese is pressed into briquettes with a weight of 1.5–5 kg under pressure — Treatment of 3 KP boiling steel produced in a 50 kg induction furnace. produced by decree briquettes in the amount of 0.1% of thall. The compositions of the proposed mixture, as well as the content; forma in the metal before and after are presented in the table .. a mixture of mass known for S when it is used for refiner and phos, it became possible to reduce the cost of steel itself, depending on March 10575681. known has the best refining ability and at a cost lower by 30-50%, in the result of which ki at 0.01-0.1 ru8.

Claims (2)

1. SLAG-FORMING MIXTURE containing lime, a hydrocarbon-containing material, ferromanganese, characterized in that, in order to increase the refining ability and reduce its cost, it additionally contains blast furnace dust with the following components, wt.%: Ferromanganese In the hydrocarbon-bearing material Lump of lime the ratio 3-8 0.2-1, 8 5-25 Rest 2. A mixture of pop. 1, characterized by the fact that blast furnace dust has the following chemical composition, wt.%: Silicon oxides 8-12, aluminum oxides 1-4, iron oxide 40-55, iron oxide 10- 20, calcium oxide 5–15, magnesium oxide 1–5 ”manganese oxides 0.3–2.5, carbon oxides 5–10, other oxides remaining. sl m O1 od