Submerged arc foaming refining agent and preparation method thereof

Abstract

The invention discloses a submerged arc foaming refining agent and a preparation method thereof. The submerged arc foaming refining agent comprises the following raw materials by weight: 10 to 30 of high calcium white ash, 30 to 60 of calcium carbonate, 10 to 20 AD powder, 10 to 30 of barium carbonate, 4 to 10 of fused magnesite, 10 to 30 of dolomite, 4 to 8 of sodium lignosulfonate, 2 to 4 of paper pulp waste liquid and 3 to 6 of water. According to the invention, a basic slag system having capability of storing bubbles is employed and is compounded with surface active substances capable of adjusting slag viscosity, surface tension and solid phase particles; raw materials are reasonably collocated, the basic slag system is guaranteed to release gas and form compounds with a plurality of fine pores in polymers so as to obtain a foaming state through a pyrolysis reaction, the thickness of a slag layer is increased, and continuous stabilization of the slag layer is realized, thereby reducing radiation of arc to refractory materials and improving the heating effect of arc; further, a proper amount of a deoxidation and desulphurization promoter is added into the basic slag system, andtherefore, the content of oxides in steel is reduced, there is no increase of carbon and silicon, a good adsorption and inclusion effect is obtained, time for refining is shortened, and the service life of steel ladles is prolonged.

Description

technical field [0001] The invention relates to metallurgy, a fluorine-free, carbon-free, high-alkalinity submerged-arc foaming refining agent for LF furnace refining and a preparation method thereof. Background technique [0002] Submerged arc foaming refining agent generally refers to the use of arc heating in the ladle during the refining process of the LF furnace to achieve rapid temperature rise, adjust the composition of steel grades, coordinate the rhythm of steelmaking and continuous casting, and achieve timely slag formation and continuous and stable production. Bubbles, always good submerged arc effect during electrode heating. Reduce the erosion of the refractory material of the ladle due to the radiation of the arc, and increase the service life of the ladle. At the same time, the gas generated due to the influence of the arc heat will not enter the molten steel, and the effect of purifying the molten steel will be achieved. For this reason, the submerged arc f...

AI Technical Summary

Problems solved by technology

Through long-term use and verification, and the current trend of various steels in the steel industry, it is found that there are many defects in the original slag system: 1. The foam life is short and the foaming efficiency is low; 2. The fluoride calcium slag is easy to produce volatiles under high temperature. , the continuous effect of foam is unstable, and it erodes the furnace lining, reduces the service life of the ladle, and pollutes the environment; 3. Although calcium carbide and silicon carbide can solve the above problems, they will pollute the molten steel and easily increase carbon when used on some steel types

It cannot meet the needs of developing ultra-low carbon steel; 4. Single submerged arc slagging has little effect on deoxidation and desulfurization