Cinder modifier composition for casting and use method thereof

Abstract

The invention provides a cinder modifier composition for casting and use method thereof. The composition substantially consists of calcium oxide CaO, sodium oxide Na2O, aluminum oxide Al2O3, silica SiO2 and ferric oxide Fe2O3; the invention further provides the use method of the modifier composition in the casting process, thereby reacting the composition with the oxides in the cinder ingredientssuch as ferric oxide, magnesium oxide and manganese oxide, rising the alkalinity degree of the cinder to weaken the bonding force of the ingredients in the cinder to soften the cinder, so that the occurrence of bridging is avoided, the durability of the liner of the induction melting furnace and the purification rate of the molten steel are improved.

Description

technical field [0001] The present invention provides a composition used in the iron and steel casting process and its use method. More specifically, it relates to a foundry slag modifier composition and its use method that can change the characteristics of slag to improve smelting efficiency. . Background technique [0002] Traditional electric furnace foundries use scrap iron 1 or pig iron to add additives such as (C, Si, Mn, P, S..., etc. elements) of the required target components, and directly melt into steel in the induction melting furnace 2. After the (iron) liquid is poured into the mold cavity to obtain the required casting. [0003] Casting process such as figure 1 and figure 2 As shown, in the process, the slag produced by the impurities contained in the scrap iron 1 and the added alloy is not easy to be carried out during the melting process, so a heating program must be used to increase the melting temperature so that the impurities in the molten steel (iro...

AI Technical Summary

Problems solved by technology

The usual casting process has the following disadvantages: 1. During the process, part of the slag 4 will float on the surface of the molten steel (iron) 3, which can be removed by means of slag remover, etc., and the rest will be dispersed in the molten steel (iron) 3. After heating up, the slag 4 floats up so that it can be removed again

During the process, if the slag 4 is too much, when it floats on the surface of the steel (iron) water 3 and contacts with the air with a lower temperature, it is easy to harden and agglomerate, forming a bridging phenomenon, such as figure 2 As shown, the scrap iron 1 added later cannot sink into the induction melting furnace 2 smoothly, forming a feeding obstacle and prolonging the total working time

And after the preliminary slag removal is completed, the molten steel (iron) 3 must be heated up again and slag removed again, which is also a waste of energy

2. A small number of foundry companies will add slagging agents in the smelting process. The known slagging agents use fluorite (calcium fluoride) or limestone (calcium carbonate) as the main slagging agents, but the effect is not good. Fluorite will produce fluoride during use, which is very harmful to the environment; while limestone has a poor slagging effect and needs to reach a certain temperature to be beneficial

3. If the slag 4 remains on the furnace wall, the incomplete removal of the slag 4 will make the induction effect of the induction melting furnace 2 worse, so more energy will be consumed to meet the temperature requirements for casting, which will also cause energy and cost waste of

4. If the slag removal is incomplete, the slag 4 remaining in the steel (iron) water 3 will reduce the purification rate of the steel (iron) water 3, and the residue of the slag 4 will weaken the bonding ability between iron atoms, resulting in the extension of the steel material Poor performance and strength, which will reduce the yield of subsequent castings

5. The reaction between the slag 4 and the refractory material of the furnace lining 5 will reduce the life of the furnace lining 5

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