Slag-adhesion-preventing refractory castable for molten iron composite slagging-off plate, and preparation method and use method of slag-adhesion-preventing refractory castable

Abstract

The invention discloses a slag-adhesion-preventing refractory castable for a molten iron composite slagging-off plate, and a preparation method and a use method of the slag-adhesion-preventing refractory castable, wherein the anti-sticking slag refractory castable comprises 37-45% of high alumina clinker, 18-25% of electro-fused mullite, 10-20% of silicon carbide, 6-10% of alpha-Al2O3 micro powder, 1-3% of silicon oxide micro powder, 4-6% of pure calcium aluminate cement, 3-5% of corundum fine powder, 1-3% of heat-resistant steel fibers, 2-5% of expanded graphite fine powder, and 1-2% of spodumene fine powder. Auxiliary raw materials comprise an antioxidant, polyvinyl alcohol explosion-proof fibers and a water reducing agent, and the surface of the corundum fine powder is coated with a nano carbon film; the comprehensive purposes of prolonging the service life of the composite slagging-off plate, preventing slag from adhering to a refractory material lining of the slagging-off plate, improving the slagging-off efficiency, shortening the slagging-off time, reducing the slagging-off iron loss, avoiding the labor intensity of manual cleaning of adhered slag of the conventional composite slagging-off plate, simplifying the slagging-off operation and the like are achieved.

Description

technical field [0001] The invention relates to the technical field of molten iron slag removal board devices, in particular to a molten iron composite slag removal board anti-sticking refractory castable, a preparation method, and a use method. Background technique [0002] There is a lot of slag in the molten iron entering the converter, which not only affects the precise control of the composition and impurity content of molten steel, but also leads to large fluctuations in the quality of molten steel. At the same time, the consumption of flux increases and the smelting time prolongs, resulting in increased production costs and reduced smelting efficiency; Furnace belt slag volume. However, it is difficult to avoid blast furnace iron slag, especially after the pretreatment of molten iron, a large amount of pretreated slag floats on the liquid surface of the molten iron. For this reason, domestic and foreign iron and steel enterprises have equipped with molten iron slag re...

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Problems solved by technology

For example: the Chinese patent "A kind of molten iron slag removal plate, authorized announcement number CN202054847U" discloses a cast steel slag removal board with a spherical surface on the front and back and a convex arc surface on the bottom surface, which improves the floating resistance of the slag removal board. The slag containment capacity and the amount of slag removal in a single slag removal action can reduce the gap between the bottom surface of the slag removal plate and the concave surface under the iron nozzle of the molten iron tank, and prevent the solidification and accumulation of scum and molten iron in the iron nozzle during the reflux process. The surface of the board is dip-coated with graphite paint to reduce the slag-iron adhesion of the slag-removing board, reduce the oxidation and ablation of the slag-removing board, and achieve the purpose of prolonging the life of the slag-removing board. It is difficult to effectively implement high-quality coatings, slag sticking to iron, oxidation melting, and high-temperature carburizing melting, etc., making it difficult to maintain a limited-scale convex structure, and it has not been popularized due to production costs.

The Chinese patent "A new type of hot metal slag removal board, authorized announcement number CN201807734U" discloses a cast steel slag removal board whose front, back and bottom surfaces are arc-shaped, and the slag removal is realized by arranging a gas cooling channel inside the slag removal board The on-line cooling of the slag stripper during the process can reduce the high temperature oxidation and corrosion of the slag stripper and achieve the purpose of prolonging the life of the slag stripper. Once the cooling channel of the slag removal plate is ablated, it must be replaced, which will affect the production rhythm

[0007] In summary, in order to shorten the time of molten iron slag removal, reduce the iron loss of slag removal, and prolong the service life of the slag removal board, relevant scholars have successively carried out research on the shape and structure of the metal slag removal board, the structure and preparation materials of the composite slag removal board, etc. Continuous improvement research has been carried out, and the expected use effect has been achieved in actual production. However, with the substantial extension of the service life of the composite slag removal board, the problem of slag sticking to the slag removal board has gradually deteriorated. The mechanical damage of the slag plate refractory lining is out of service, which seriously restricts the actual production and application effect and economic benefits of the slag plate

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