Production method for removing iron and increasing nickel from iron-nickel alloy

The invention belongs to the technical field of iron-nickel alloy smelting, and relates to a production method for removing iron and increasing nickel from an iron-nickel alloy. An intermediate frequency furnace and an electric furnace are combined to melt an iron-nickel alloy raw material, pre-melting liquid is provided for an argon oxygen refining furnace, the melting efficiency of the electric furnace is improved through the production mode that the intermediate frequency furnace is matched with the electric furnace, in the oxygen blowing fluxing process of the electric furnace, C removal, Si removal, Fe removal and P removal are completed, and stainless steel refining is achieved through the argon oxygen refining furnace; the nickel content in the iron-nickel alloy produced through the method is increased by 30%-50%, P is removed while Fe is removed, nickel-containing molten iron with the P content smaller than 10 ppm level is produced, one path of high-quality ferronickel resources and pure nickel resour