Pig iron for nodular cast iron and smelting method thereof

The invention discloses pig iron for nodular cast iron and a smelting method thereof, and the method comprises the following steps: taking semisteel produced by a titanium slag electric furnace as a raw material, slagging, alloying and recarburizing to obtain the pig iron for nodular cast iron, wherein the final slag at the end of smelting comprises the following components in percentage by mass: 32-36% of CaO; 15%-18% of SiO2; 2%-5% of Al2O3; 1%-3% of MgO; 33% to 38% of CaF2; and 5%-9% of S. According to the method, the content of S and the content of Al in the pig iron for nodular cast iron can be controlled to be lower, so that higher requirements are met, the slag system has the advantages of being low in melting point, wide in low-melting-point area and the like, the slag system is suitable for lower recarburization temperature, and therefore power consumption can be reduced. 本发明公开了一种球墨铸铁用生铁及其冶炼方法，方法包括：以钛渣电炉生产的半钢为原料，进行造渣、合金化以及增碳后得到所述球墨铸铁用生铁；其中，使得冶炼结束时的终渣按质量百分比计包含：CaO：32％～36％；SiO2：15％～18％；Al2O3：2％～5％；MgO：