Since the beginning of the decade, there has been a significant increase in the number of foundries of electric furnaces as a melting furnace for cast iron, and in particular those with double insulation furnaces and cupolas. In fact, cupola furnaces and electric furnaces have their own advantages and limitations, and in the past two years, both have had many important technological developments. It is not appropriate to assert in general terms that it is not based on specific analysis. Judging from the equipment of industrialized countries, large-scale high-output cast iron plants mostly use cupolas, but they are generally equipped with high-capacity melting-furnace insulated furnaces. Most small-scale cast iron plants use induction furnaces. Select the smelting equipment, the foundry should proceed from the actual situation, weighing all aspects of the conditions and decide to choose. The low equipment cost and small floor space for continuous supply of molten iron are well known and need no explanation. In the cupola, there is only free oxygen in the limited area near the tuyere.
As the furnace gas rises and its coke reacts, free oxygen is quickly depleted and the furnace gases involved in the metallurgical reaction are mainly and under normal operating conditions. On the whole, the furnace atmosphere is not oxidizing. In addition, there is a good purifying effect when hot metal passes through the hot coke layer. Therefore, by melting in a cupola, it is easy to obtain a molten iron with excellent properties. In the case of the same molten iron temperature and chemical composition, the liquidity of the cupola iron is superior to that of the electric furnace iron. Secondly, in recent years, automotive parts and other steel products have increasingly surface rust-preventing treatment (especially galvanizing). As the scrap of the charge, the contamination due to plating of the parts cannot be ignored. Furnace smelting by electric furnace, such as galvanized steel in the charge, there will be many problems, such as the lining and the coil is easy to damage the iron liquid quality is easy to produce blow holes. By smelting in a cupola furnace, zinc is removed from the metal charge in the pre-tropical zone and enters the dust. Therefore, it will hardly damage the lining and will not affect the quality of the molten iron. According to the statistical data of many smelting results, the performance of long cast iron was compared with cupola smelting and induction furnace smelting, and the performance index of cast iron was not lining hot air cupola furnace induction furnace carbon ferrosilicon.
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