Casting powder for continuous casting crystallizer and preparation method of casting powder

Abstract

The invention discloses casting powder for a continuous casting crystallizer. The casting powder comprises raw materials in parts by weight as follows: 3.5-15 parts of fluorite, 35-55 parts of aedelforsite, 5-15 parts of alkali, 0-2 parts of lithium carbonate, 0-10 parts of diaspore, 0-6 parts of a cement clinker, 1-5 parts of magnesia powder, 2-5 parts of pyrolusite, 0-8 parts of sodium fluoride, 0-5 parts of barium carbonate, 0-5 parts of bentonite, 1-4 parts of coke, 0-8 parts of a carburant, 1-3 parts of carbon black and 1-2 parts of a binder. According to the casting powder, the preparation cost is low; the recovery rate of the casting powder is larger than or equal to 98.5%; the color of the casting powder is uniform; the granularity is uniform; the granulation rate is high; dust is reduced; the melting point of the casting powder is low; the viscosity is low; after the casting powder is added into the crystallizer, the casting powder is melted uniformly and shows excellent spreadability, heat retaining property and adsorptive property; heat is transferred uniformly all around the crystallizer, and the lubrication is excellent; and defects such as concave pits, impurities and the like don't exist on the surface of a casting blank, the internal quality is excellent, and the qualified rate of the casting blank is equal to or larger than 99.8%.

Description

technical field [0001] The invention belongs to the technical field of steelmaking auxiliary materials, and in particular relates to a continuous casting mold mold slag and a preparation method thereof. Background technique [0002] With the increasingly severe steel situation, the steel production capacity is seriously oversupplied, the price of raw materials and fuels is running at a high level, and the steel industry is losing money year by year. All iron and steel enterprises have lowered the purchase price of various mold slag products one after another. In addition, the prices of various production raw materials for continuous casting mold slag have risen. The cost reduction and efficiency increase of metallurgical auxiliary material enterprises are extremely important for their survival. All mold slag manufacturers are actively seeking high-quality, cheap, and stable raw materials to improve market competitiveness and improve their ability to resist market risks. ...

AI Technical Summary

Problems solved by technology

Manganese carbonate produces CO when heated 2 Gas volatilization increases the consumption of slag and increases the consumption cost of mold slag per ton of steel. In addition, thermal decomposition is an endothermic process, which is not conducive to the heat preservation of mold slag

[0004] Chinese patent CN101658909B discloses a medium-carbon steel wide slab manganese-containing mold powder, its mass percentage ratio is: calcium oxide 36.09, silicon dioxide 25.40, aluminum oxide 2.40, magnesium oxide 3.34, Iron 1.47, manganese carbonate 5.00, calcium fluoride 14.00, sodium oxide 7.30, lithium oxide 0.41, fixed carbon 4.59, slag alkalinity CaO / SiO 2 : 1.25~1.50; Manganese carbonate is used in the preparation raw material of the mold flux in this invention, the consumption of the mold flux is relatively large, and the cost is relatively high

Chinese patent CN103128243B discloses a continuous casting mold powder for high-alumina steel. 6 parts, 3-6 parts of earthy graphite, 24-31 parts of calcium balls, 17-25 parts of refining slag, 3 parts of lithium carbonate, 9-15 parts of bauxite, 4 parts of barium carbonate, 3 parts of manganese carbonate, 5 parts of borax parts, the source of MnO in this invention is also manganese carbonate, which increases the use cost of mold flux