Molten steel refining fluxing agent and its making method

Abstract

The invention provides a molten steel refining fluxing agent and its making method. The fluxing agent comprises the following chemical components by weight: 5%-10% of CaO, 20%-30% of MgO, 2%-5% of CaF2, 25%-35% of Al2O3, 2%-5% of B2O3, 15%-25% of SiO2, and the balance less than 20% of inevitable impurities. The making method comprises: 1) conducting burdening: mixing 100-200 mesh industrial raw material powder containing CaO, Al2O3, SiO2, MgO, B2O3 and CaF2 uniformly according to the weight percentage of the fluxing agent; 2) performing ball making: adding 5%-10% of water glass, mixing them evenly, and pressing the mixture into a spherical material; 3) subjecting the spherical material to baking drying for 1-2h at 250-300DEG C, and then cooling the spherical material to room temperature for 4-6h; and 4) conducting screening to obtain the material with a particle size of 10-40mm and a weight content of greater than or equal to 95%, i.e. a finished product. The molten steel refining fluxing agent provided by the invention lowers the melting point of refining slag, shortens the slagging time, improves the refining production rate, and does not pollute the molten steel, and slightly erodes the furnace lining. Compared with the use of fluorite, the production cost is low, and the environmental pollution is small.

Description

technical field [0001] The invention belongs to the technical field of refining in steelmaking production, and particularly relates to a molten steel refining flux that is added to the surface of molten steel slag when molten steel is refined outside a furnace to shorten slagging time and improve refining efficiency. Background technique [0002] In steelmaking production, molten steel of many steel types needs to enter the LF furnace for refining treatment. The usual practice is: after the ladle enters the LF furnace station to measure the temperature, add materials such as fluorite, refining slagging agent and alloy into the ladle. The function of using fluorite is to shorten the time of slag removal and improve production efficiency. However, the use of fluorite also has the following problems: first, fluorite pollutes the environment seriously, which greatly limits its use; secondly, fluorite has a strong erosion effect on the ladle lining, reducing the service life of ...

AI Technical Summary

Problems solved by technology

However, the use of fluorite also has the following problems: first, fluorite pollutes the environment seriously, which greatly limits its use; secondly, fluorite has a strong erosion effect on the ladle lining, reducing the service life of the ladle lining; finally, fluorite The natural resources of mines are getting less and less, their prices are getting higher and higher, and the production costs have increased a lot

This invention uses a large amount of waste boron mud, which reduces the production cost and protects the environment, but the actual refining and fluxing effect is limited

First of all, the composition of boron mud is very unstable, resulting in large fluctuations in the composition of the flux slag, which is difficult to control

Secondly, the melting point of the fluxing slag is high, and the use effect is not stable

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