Smelting method for metallurgical electric-furnace

A smelting method for the metallurgical electric furnace comprising:

• a furnace body provided with a furnace chamber;
• an oxygen lance located on a side wall of the furnace chamber and used for blowing oxygen into slag promoting the smelting process, wherein the outlet of the oxygen lance is higher than the slag;
• and
• a coal lance located on the side wall of the furnace chamber beside the oxygen lance and used for injecting coal particles into the slag, wherein the outlet of the coal lance is higher than the slag, wherein the slag comprises a reduced state substance capable of being oxidized by oxygen, and the smelting method comprises:
• blowing oxygen into the slag via an oxygen lance so as to oxidize the reduced state substance to an oxidization state substance;
• and
• spraying coal into the slag through a coal lance so as to reduce the oxidized oxidization state substance.