Smelting method for metallurgical electric-furnace

Abstract

The present disclosure provides a metallurgical electric furnace, and a smelting method for the metallurgical electric furnace. The metallurgical electric furnace includes a furnace body, an oxygen lance and a coal lance, wherein the furnace body is provided with a furnace chamber; the oxygen lance is located on a side wall of the furnace chamber and is used for blowing oxygen into the slag promoting the smelting process, and the outlet of the oxygen lance is higher than the slag; and the coal lance is located on the side wall of the furnace chamber beside the oxygen lance and is used for spraying coal into the slag, and the outlet of the coal lance is higher than the slag.

1 . A 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.   
     
     
         2 . The metallurgical electric furnace according to  claim 1 , comprising:
 a plurality of oxygen lances that are uniformly distributed along the side wall of the furnace chamber; and   an equal number of coal lances that are uniformly distributed along the side wall of the furnace chamber,   wherein the oxygen lances are located below the coal lances, or the oxygen lances and the coal lances are located at the same height on the side wall of the furnace chamber.   
     
     
         3 . The metallurgical electric furnace according to  claim 1 , further comprising:
 a spray tube located on the side wall of the furnace chamber and used for spraying a hydrocarbon into a furnace freeboard, wherein the outlet of the spray tube is higher than the slag.   
     
     
         4 . The metallurgical electric furnace according to  claim 3 , wherein
 the spraying direction of the hydrocarbon into the furnace freeboard can be (but not limited to) tangential to the side wall of the furnace chamber.   
     
     
         5 . 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.   
     
     
         6 . The smelting method according to  claim 5 , wherein
 the depth of the oxygen blown into the slag does not exceed one-half of the thickness of the slag.   
     
     
         7 . The smelting method according to  claim 6 , wherein
 the depth of the oxygen blown into the slag is within the range of one-third of the thickness of the slag to one-half of the thickness of the slag.   
     
     
         8 . The smelting method according to  claim 5 , wherein
 the coal is anthracite or bituminous coal.   
     
     
         9 . The smelting method according to  claim 5 ,
 wherein after spraying the coal into the slag through the coal lance, the method further comprises:   blowing a hydrocarbon into the furnace freeboard through a spray tube.   
     
     
         10 . The smelting method according to  claim 9 , wherein
 the hydrocarbon comprises natural gas or light oil.   
     
     
         11 . The smelting method according to  claim 9 , wherein while spraying the hydrocarbon into the furnace freeboard through the spray tube, the method further comprises:
 spraying liquid water and/or gaseous water into the furnace freeboard through the spray tube.