What are the design principles for protecting slag components?
Release time:
2020-07-30
Currently, widely used in continuous casting Protective slag is based on a ternary compound of Cao-SiO2-Al2O3 Protective slag system. It also contains appropriate amounts of compounds such as Na2O, CaF2, and K20. After melting, the molten slag is a weakly acidic or neutral liquid slag, which has good wettability to the molten steel, and the slag viscosity changes smoothly with temperature.
Continuous casting protective slag constituent materials:
1. Basic slag. Alkaline furnace slag containing calcium oxide, silicon dioxide, and aluminum oxide. According to the Cao-SiO2-al2o3 ternary phase diagram, the composition range of these three compounds is: Ca0 10 ~ 38%, Si02 40 ~ 60%, al2o3 less than 10%. Melting point above 1300.
2. Flux. For example, Na2O and CaF2 can reduce the melting point and viscosity of the slag. Depending on the resource situation, LiO2, K20, BaO, NaF, B2O3, etc. can also be selected as fluxes, and the amount added depends on the melting point of the slag.
3. Regulator. Carbon particles are regulators of melting speed. The amount added is 5-7%.
According to the steel grade requirements, the appropriate Protective slag proportions have been determined through experiments.
Preparation Protective slag The main raw materials are:
Production Protective slag Raw materials include natural minerals, industrial waste, and industrial products. Raw materials used as basic furnace slag include cement, cement clinker, wollastonite, feldspar, power plant flue gas, blast furnace slag, electric furnace white slag, etc. Auxiliary materials used as fluxes include caustic soda, fluorite, cryolite, borax, lithium carbonate, etc. Molten rate modifiers include natural graphite, carbon black, etc.
Preparing a suitable composition Protective slag is the key to achieving the five functions of protective slag. For more information about Protective slag this, please consult Luoyang Turner High Temperature Instrument Co., Ltd., a professional manufacturer of high-temperature laboratory equipment and reagents.
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